taxonID	type	description	language	source
E55E156EFC7F4B450C9BFC5EFB3FFE6F.taxon	type_taxon	Type species. Goniopugettia tanakae Sakai, 1986; by original designation. Gender feminine. Updated diagnosis. Carapace pyriform; dorsal surface with regions well defined; pseudorostral spines fused along proximal half, dorsoventrally flattened, lateral margins with sharp edge, apically blunt; supraorbital eave very narrow, almost confluent with lateral edges of pseudorostral spine, preorbital tooth or spine hardly discernible; postorbital tooth short, triangular, inner surface gently concave; hiatus between supraorbital eave and postorbital tooth U-shaped; hepatic, epibranchial and mesobranchial spines prominent, parallel, directed laterally, each with rounded tip; epibranchial spine dorsoventrally flattened; cardiac and intestinal regions raised vertically but without spines or tubercles, posterior carapace margin unarmed, distinctly convex. Basal antennal article subrectangular, distinctly longer than broad, lateral margin almost straight to gently concave. Third maxilliped with ischium subrectangular, elongate. Cheliped and ambulatory legs with margins of merus, carpus, propodus and dactylus rounded or at most bluntly carinate (cheliped carpus and palm). First ambulatory leg (second pereopod) longest. Male third and fourth thoracic sternites fused without median sutures; fourth sternite prominently concave; sterno-pleonal cavity not reaching anteriorly to level of proximal margins of coxae of chelipeds. Male and female pleon with 6 free somites + telson; male pleon triangular, sixth somite rectangular. First gonopod slightly curved outward; distal part styliform with acutely pointed tip located at distolateral portion. Second gonopod short, tapering to weakly bilobed tip, flagellum absent.	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7F4B450C9BFC5EFB3FFE6F.taxon	discussion	Remarks. Sakai (1986) proposed a new genus Goniopugettia to accommodate two species: Pugettia sagamiensis Gordon, 1930, and Goniopugettia tanakae Sakai, 1986. No type species was selected, and consequently this name under Sakai’s authorship is not available under ICZN Article 13.3 (ICZN 1999). Ng et al. (2008: 103) selected Goniopugettia tanakae Sakai, 1986, as the type species of Goniopugettia but, as Davie & Ng (2024) argued, this action did not satisfy ICZN Article 16.1, because there was no declaration that they were intentionally establishing a new taxon. Davie & Ng (2024) resolved the situation by formally establishing Goniopugettia with G. tanakae as its type species. The above generic diagnosis is updated from that of Ng et al. (2017), incorporating the male characteristics. Recent studies have attempted to revise the status of Rochinia Milne-Edwards, 1875 and other allied genera (Richer de Forges & Ng 2009; Lee et al. 2019, 2020, 2021). One of the two species originally assigned to Goniopugettia by Sakai (1986), Pugettia sagamiensis, was assigned to Rochinia by Griffin & Tranter (1986 a) at the almost same time. Ng et al. (2017) reappraised the taxonomic status of Goniopugettia and established a new genus, Tunepugettia, for Pugettia sagamiensis. Goniopugettia is readily recognized among allied epialtid genera by (1) the dorsoventrally flattened pseudorostral spines, (2) prominent, parallelly produced hepatic, epibranchial and mesobranchial spines, each with a rounded tip, (3) the cardiac and intestinal regions being raised vertically but without spines or tubercles, and (4) non-carinate or non-cristate margins of pereopod articles except for the cheliped carpus.	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7C4B420C9BFD84FA97FDA6.taxon	description	(Figures 1 – 3)	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7C4B420C9BFD84FA97FDA6.taxon	materials_examined	Material examined. JAMSTEC 106776, 1 male (24.0 × 15.6 mm), R / V Kaimei, KM 20 - 10 C cruise, KM-ROV dive # 132, Ritto Seamount, northern West Mariana Ridge, 21 ° 48.72 ' N, 142 ° 02.68 ' E, 666 m, staying on a colony of primnoid coral, suction sampler, 8 December 2020. Supplemental description. Carapace (Fig. 1) and cephalic appendages similar to female holotype redescribed by Ng et al. (2017), except for proportionally broader carapace (1.5 times as long as broad). Male chelipeds (Figs. 1, 2 A – C) equal in length and similar in shape, almost glabrous. Ischium with lower distal angle produced into small tubercle. Merus trigonal in cross-section with blunt longitudinal ridges, with small tubercle on upper distal end; upper margin with few small blunt tubercles proximally; outer surface with low, obtuse median ridge, slightly rugose; lower outer ridge with 1 blunt tubercle. Carpus short, with 2 blunt crests on dorsal surface; outer surface with low tubercle medially; inner lower margin bluntly ridged. Chela 2.3 times as long as wide, somewhat compressed; lower margin slightly notched at base of fixed finger. Palm subrectangular, 1.3 times as long as wide; upper margin forming blunt ridge over entire length; outer and inner surfaces gently convex, with scattered minute punctae; lower margin rounded; fixed finger not deflexed, slightly sinuous, terminating in subacute tip, occlusal margin with row of small blunt teeth in distal half. Dactylus subequal in length to palm, curved proximally, terminating in bunt tip meeting tip of fixed finger, occlusal margin with row of blunt teeth on distal 0.7 length; wide hiatus between fingers. Thoracic sternum (Fig. 3) covered with short pubescence. Sternites 1 and 2 completely fused, forming small triangular plate, partially fused with sternite 3 with faint transverse suture. Fused third and fourth sternites with deep depression posteriorly bifurcate into 2 grooves extending nearly to level of anterior end of sterno-pleonal cavity; lateral margins concave at articulation with coxae of chelipeds. Fifth to seven sternites grooved along sutures. Pleon (Figs. 2 D, 3) narrowly triangular, surface covered with dense short pubescence, with 6 free somites + telson, midline of each somite elevated into low protuberance or tubercle. Third and fourth somites trapezoidal. Fifth and sixth somites subrectangular, subequal in length. Telson triangular, subequal in length to somite 6, with almost straight lateral margins. First gonopod (Fig. 2 E – H) slightly curved outward; distal part styliform with acutely pointed tip located at distolateral portion. Second gonopod (Fig. 2 I) short, about a quarter length of G 1, tapering to weakly bilobed tip, no distal segment or flagellum. Colouration in life. Carapace with raised areas pinkish red, non-raised areas paler; chelipeds generally pinkish red, fingers whitish; ambulatory legs pale pinkish brown (Fig. 1).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7C4B420C9BFD84FA97FDA6.taxon	description	Genetic data. COI gene: LC 856569 (654 bp); 16 S rRNA gene: LC 856565 (557 bp).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7C4B420C9BFD84FA97FDA6.taxon	discussion	Remarks. The present male specimen agrees well with the female holotype in the characteristic morphology of the carapace (see above). Now male characteristics of the species are clarified (see above supplemental description). We have generated sequences of the COI and 16 S rRNA genes of Goniopugettia tanakae for the first time. In the BLAST search, there were no sequences showing close similarities (> 90 %) to that of G. tanakae; the 16 S rRNA gene sequence had 95 – 96 % similarity to sequences of Oxypleurodon difficilis (Guinot & Richer de Forges, 1985) (MZ 424942, MZ 424943, MZ 424945: Muñoz et al. 2021).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7C4B420C9BFD84FA97FDA6.taxon	distribution	Distribution. Known with certainty from Ritto Seamount, West Mariana Ridge, 666 m deep (this study).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7B4B4B0C9BFD15FEBFFC29.taxon	description	(Figures 4 – 8)	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7B4B4B0C9BFD15FEBFFC29.taxon	materials_examined	Material examined. Holotype. JAMSTEC 106777, male (31.6 × 19.5 mm), R / V Kaimei, KM 20 - 10 C cruise, KM-ROV dive # 132, Ritto Seamount, northern West Mariana Ridge, 21 ° 48.58 ' N, 142 ° 02.66 ' E, 617 m, rock, suction sampler, 8 December 2020.	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7B4B4B0C9BFD15FEBFFC29.taxon	diagnosis	Diagnosis. Carapace with 15 prominent, sharp, upright dorsal spines (paired preorbital; paired hepatic; 3 gastric; 1 median cardiac; 1 median intestinal; on each side, 3 pairs branchial); hepatic spine conical. Male cheliped ischium unarmed on upper distal margin; merus rounded in cross section; carpus with blunt carina on upper outer margin; palm upper margin rounded, non-carinate. First ambulatory leg (second pereopod) merus armed with upper distal spine. First gonopod straight, distal part forming 3 unequal lobes, distolateral lobe well developed, directed distolaterally.	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7B4B4B0C9BFD15FEBFFC29.taxon	description	Description. Carapace (Figs. 4 – 7 A) pyriform, 1.6 times longer than wide (except for pseudorostral spines); pseudorostral spines long (0.6 times as long as carapace), slender, slightly curved and prominently diverging outwards, cylindrical in cross-section. dorsal surface with regions defined by shallow sulcus, with dense fields of short curled setae on gastric region and lateral sides; dorsal spines also with covering of short pubescens, other parts almost glabrous; no covering of granules; 15 prominent spines present on carapace: obliquely erect preorbital spine on each side; gastric region with 3 erect spines (1 median and 2 shorter submedian spines, about 0.2 length of median spine, each on just lateral to median spine); hepatic spines remote from postocular tooth, slightly curved, directed dorsolaterally; branchial regions with 3 pairs of spines, 2 medial spines pointed dorsally, unequal in length, lateral epibranchial spines strongest, directed dorsolaterally; cardiac region elevated, with 1 median spine slightly shorter than gastric median spine; intestinal region with 1 median spine directed posterodorsally. Supraocular eave short; postocular tooth relatively short, anterior margin roundly truncate, inner surface shallowly excavate. No additional spine on hepatic regions; pair of low tubercles on gastric region anterior to submedian gastric spines. Suborbital margin confluent with lateral margin of basal antennal article. Pterygostomial area separated from subbranchial region by row of 3 tubercles. Ocular peduncle (Figs. 4, 5) short, inflated basally with constriction proximal to base of cornea, surface covered with pubescens. Cornea rounded, darkly pigmented. Inter-antennular septum with convex ventral margin. Epistome slightly depressed medially; anterior margin trilobate, median lobe extending anteriorly and connected with inter-antennular septum (Fig. 7 A). Buccal cavity with anterior ridge divided by deep, slit-like median incision, either lateral ridge further divided by narrow incision; anterolateral margins each elevated into blunt lobe. Antennules (Fig. 7 A) folding vertically. Basal antennal article (Fig. 7 A) distinctly longer than broad, with obtuse distolateral tooth; penultimate + ultimate peduncular articles slightly curved inwards, latter slightly shorter than former, with tuft of few stiff setae at distomesial angle, directed mesially; flagellum slightly longer than ultimate peduncular article. Third maxillipeds (Figs. 7 A, 8 A) completely covering buccal cavity when closed; outer surface smooth, covered with short pubescence. Ischium slightly wider distally than proximally, with distinct, broad median sulcus. Merus subquadrate, depressed medially, anterolateral margin auriculiform. Exopod relatively stout, reaching to just proximal to distal edge of merus, with moderately long flagellum. Chelipeds and ambulatory legs generally covered with short pubescens. Chelipeds (Figs. 4, 8 B – D) subequal, chelae not particularly inflated. Merus subcylindrical without distinct ridges or crests, having conspicuous upper distal tooth ascending at about 45 ° against horizontal plane; upper surface with 2 low, blunt tubercles in proximal half; lower surface with 1 (right) or 2 (left) low, blunt tubercles proximal to midlength along outer side. Carpus short, cup-shaped; upper surface convex, with blunt carina along outer side. Chela 3.4 times as long as wide. Palm about twice as long as wide; upper margin rounded, non-carinate, proximal part expanded into prominent knob-like protuberance; lower margin also rounded, non-carinate, also with knob-like protuberance proximally; fixed finger nearly straight, not deflexed, glabrous, with row of small blunt teeth on occlusal margin. Dactylus 0.9 times as long as palm, slightly curved, glabrous; occlusal margin with row of low, blunt teeth. Ambulatory legs (second to fifth pereopods) (Fig. 4) moderately long, slender; first leg longest, fourth leg shortest. Ischium unarmed on upper distal margin. Meri subcylindrical, with conspicuous, obliquely erect distal spine on upper distal angle in first leg, or blunt tubercle in second to fourth legs. Carpi short, upper surfaces slightly flattened. Propodi linear. Dactyli moderately slender, slightly curved, tapering to slender, naked corneous claws, 0.8 times as long as propodus in first leg. Thoracic sternum (Fig. 7 A, B) covered with short pubescence. First and second sternites completely fused, forming small triangular plate, fused with third sternite. Third and fourth sternites also fused but boundary between those sternites marked by shallow transverse groove; fourth sternite depressed anteriorly, anterolateral margins broadly concave to accommodate coxae of chelipeds, not markedly constricted. Sutures between posterior sternites deeply marked. Pleon (Fig. 8 E) narrowly triangular, with 6 free somites + telson, midline of each somite elevated into low protuberance or tubercle. Third and fourth somites each trapezoidal. Fifth and sixth somites subrectangular, subequal in length. Telson triangular, subequal in length to sixth somite, with almost straight lateral margins; proximal margin distinctly narrower than distal margin of sixth somite. First gonopod (Fig. 8 F – I) nearly straight, flattened, slightly tapering; distal part forming 3 lobes; distolateral lobe triangular with blunt apex, directed distolaterally, median lobe broadly convex with microscopic setae, distomesial lobe obtuse. Second gonopod (Fig. 8 J) short, about a quarter length of first gonopod, tapering to rounded tip, subterminally with faint convexity on lateral margin; no distal segment or flagellum. Colouration in life. Carapace dorsal surface generally whitish; spines on carapace, pseudorostral spines and pereopods pinkish, cheliped fingers white in distal parts (Fig. 4). Genetic data. COI gene: LC 856568 (659 bp); 16 S rRNA gene: LC 856564 (548 bp).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7B4B4B0C9BFD15FEBFFC29.taxon	etymology	Etymology. The name is derived from combination of the Latin words, quindecim (= fifteen) and spina (= spine) in reference to the 15 prominent spines on the carapace of this new species. The name is used as a noun in apposition.	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7B4B4B0C9BFD15FEBFFC29.taxon	discussion	Remarks. The genus Samadinia was originally established for a single species S. longispinosa Ng & Richer de Forges, 2013 from French Polynesia and New Caledonia. A review by Lee et al. (2021) of species assigned to Rochinia resulted in the reassignment of 25 Indo-West Pacific species to Samadinia, significantly altering the original generic diagnosis. Since then, 11 new species have been described from various Indo-West Pacific localities in Samadinia (Richer de Forges et al. 2021; Takeda et al. 2022; Ahyong et al. 2023; Davie & Lee 2023; Lee et al. 2023) and one species has been further reassigned to the genus (Richer de Forges et al. 2021). Currently, Samadinia is represented by 38 species (DecaNet 2025). Samadinia quindecimspina sp. nov. is similar to members of the S. pulchra group as discussed by Lee et al. (2021) and Ahyong et al. (2023), namely S. griffini (Davie & Short, 1989), S. jimlowryi Ahyong, Lee & Ng, 2023, S. livermorii (Wood-Mason in Wood-Mason & Alcock, 1891), S. paulayi (Ng & Richer de Forges, 2007), S. pulchra (Miers in Tizard, Moseley, Buchanan & Murray, 1885), and S. riversandersoni (Alcock, 1895), species which are characterised by the numerous long and sharp spines pointed outwards or upright on the carapace. The present new species has 15 long spines on the carapace (including preorbital spines), and in this regard, it appears closest to S. griffini, known from off Queensland, Australia. Other species have a different number of spines: 17 spines in S. paulayi (cf. Ng & Richer de Forges 2007: 1 A – C) and S. riversandersoni (cf. Alcock & Anderson 1896: pl. 22); and 20 or more spines in S. jimlowryi (cf. Ahyong et al. 2023: figs. 4 B, C, H, 5 A, B), S. livermorii (cf. Ahyong et al. 2023: fig. 6 A, C, F), S. pulchra cf. (Miers 1886: pl. 4 fig. 1; Ahyong et al. 2023: figs. 2, 3), and S. spinosa (cf. Lee et al. 2023: fig. 13 A, C). Samadinia quindecimspina sp. nov. is distinguishable from S. griffini by the following particulars: the submedian gastric spines are short, about 0.25 length of the median gastric spine in S. quindecimspina sp. nov. (Figs. 5 B, 6 A), rather than about 0.5 length in S. griffini (cf. Davie & Short 1989: fig. 12 A); the cheliped ischium is unarmed on the upper distal margin in S. quindecimspina sp. nov. (Fig. 8 B), rather than armed with one spine in S. griffini (cf. Davie & Short 1989: 181); and the first gonopod is straight with a more produced distolateral lobe in S. quindecimspina sp. nov. (Fig. 8 F – I), whereas it is slightly curved mesially in the distal half with a less developed distolateral lobe in S. griffini (cf. Davie & Short 1989: 11 f, g). In addition, the followings may serve as distinguishing characters, although they might exhibit ontogenetic variation (note that the size of the holotypes of S. quindecimspinosa sp. nov. (cw 19.5 mm) and S. griffini (cw 18.5 mm) is relatively similar): the cheliped carpus has only a blunt carina only on the upper outer margin in S. quindecimspina sp. nov. (Fig. 8 C), whereas it is provided with sharp carinae on the upper outer and the lower inner margins in S. griffini (cf. Davie & Short 1989: 181, figs. 11 d, 12); the cheliped dactylus is proportionally longer at 0.9 times as long as the palm in S. quindecimspina sp. nov. (Fig. 8 D) (versus 0.75 times as long as the palm in S. griffini; Davie & Short 1989: fig. 11 D); and the male pleon is relatively broader in S. quindecimspina sp. nov. (Fig. 8 E) than in S. griffini (Davie & Short 1989: fig. 11 e). According to Davie & Short (1989: fig. 11 h), two prominent processes are figured anterior to the postocular tooth in the holotype of S. griffini, but in the holotype of S. quindecimspina sp. nov. there is only one process (= preorbital spine) (Fig. 7 A). There is a need to verify if the illustration of Davie & Short (1989: fig. 11 e) is correct. Genetic data is still scarce for Samadinia. In this study, partial segments of the COI gene and the 16 S rRNA gene were generated for S. quindecimspina sp. nov. The pairwise distances between the new species and available congeneric species (S. galathea (Griffin & Tranter, 1986 b) and S. pulchra) based on the Kimura 2 - parameter model are provided for information (Tables 1, 2).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC7B4B4B0C9BFD15FEBFFC29.taxon	distribution	Distribution. Presently known only from Ritto Seamount, West Mariana Ridge, at a depth of 617 m. deletion option).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC724B4A0C9BF9E7FC36FE4B.taxon	description	(Figure 9)	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC724B4A0C9BF9E7FC36FE4B.taxon	materials_examined	Material examined. JAMSTEC 106859, 1 male (24.5 × 25.0 mm), KM 20 - 10 C cruise, KM-ROV dive # 133, Nikko Seamount, northern Central Mariana Ridge, 23 ° 04.97 ' N, 142 ° 19.51 ' E, 482 m, rock, suction sampler, 9 December 2020. Genetic data. COI gene: LC 856570 (657 bp); 16 S rRNA gene: LC 856566 (541 bp).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC724B4A0C9BF9E7FC36FE4B.taxon	discussion	Remarks. The present specimen agrees well with the original description by Komai & Tsuchida (2014). Shih et al. (2015) noted that tubercles on the branchial regions were more numerous in the Taiwanese specimen than in the type material, suggesting that more variation might be seen in this character. Nevertheless, it seems that the tubercles are less coarse in G. petricola (cf. Fig. 9; Komai & Tsuchida 2014: fig. 19 A, C; Shih et al. 2015: fig. 1 B) than in G. narusei Ng & Richer de Forges, 2007 (Ng & Richer de Forges 2007: fig. 2). Here we provide sequences of the COI and 16 S rRNA genes of Galilia petricola for the first time. In the BLAST search, there were no COI sequences showing high similarities (> 90 %) to that of G. petricola; the 16 S rRNA gene sequence had 94 % similarity to sequences of Tanaoa pustulosus (Wood Mason, in Wood-Mason & Alcock, 1891) (MZ 424937, MZ 424938, MZ 424939: Muñoz et al. 2021). No genetic data is available for the congeneric G. narusei.	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC724B4A0C9BF9E7FC36FE4B.taxon	distribution	Distribution. Presently known only from Nikko Seamount, Central Mariana Ridge, and off southern Taiwan, 482 – 595 m deep (Komai & Tsuchida 2014; Shih et al. 2015; this study).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC734B480C9BF95AFCD8FCAA.taxon	description	(Figure 10)	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC734B480C9BF95AFCD8FCAA.taxon	materials_examined	Material examined. JAMSTEC 106916, 1 female (42.2 × 58.3 mm), R / V Kaimei, KM 20 - 10 C cruise, KM-ROV dive # 135, Nikko Seamount, northern Central Mariana Ridge, 23 ° 05.01 ' N, 142 ° 19.48 ' E, 365 m, rock, suction sampler, 11 December 2020. Genetic data. 16 S rRNA gene: LC 856567 (557 bp). Colouration in life. Body and pereopods all orange-red, fingers of chelipeds black (Fig. 10).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC734B480C9BF95AFCD8FCAA.taxon	discussion	Remarks. The present female specimen agrees well with the previous accounts of B. major by Sakai (1978), Guinot & Richer de Forges (1981 b), Ikeda (1998) and Takeda & Suyama (2019). Takeda & Komatsu (2023) used “ majora ” as name of the species, but no justification was provided. It is possible to be an accidental misspelling captured by auto-correct function in MS Word software. Here, we provide a partial sequence of the 16 S rRNA gene of Beuroisia major for the first time. In the BLAST search, the 16 S rRNA gene sequence had 90 % similarity to sequences of the progeryonid Rhadinoplax microphthalmus (Guinot & Richer de Forges, 1981 b) (OR 448056: Wolfe et al. 2024), the parthenopid Parthenope longimanus (Linnaeus, 1758) (MZ 424935: Muñoz et al. 2021) and the hypothalassiid Hypothalassia armata (De Haan, 1835) (OR 448060: Wolfe et al. 2024). No genetic data is available for other species of Mathildellidae at present.	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
E55E156EFC734B480C9BF95AFCD8FCAA.taxon	distribution	Distribution. Previous records of this species are from the Northwestern Pacific localities: Kinmei Seamount in the Emperor Seamount Chain, Sagami Bay (Japan), and Okino-torishima Island, Kyushu-Palau Ridge; 180 – 600 m deep (Sakai 1978; Ikeda 1998; Takeda & Suyama 2019).	en	Komai, Tomoyuki, Tsuchida, Shinji, Fujiwara, Yoshihiro (2025): Records of brachyuran crabs (Decapoda) from seamounts in the Mariana Ridges, with description of a new species of Samadinia Ng & Richer de Forges, 2013, and rediscovery of Goniopugettia tanakae Sakai, 1986. Zootaxa 5722 (3): 326-344, DOI: 10.11646/zootaxa.5722.3.2, URL: https://doi.org/10.11646/zootaxa.5722.3.2
