taxonID	type	description	language	source
1E469946FFC0FFCBFCED62BEE220FBCC.taxon	materials_examined	Holotype. French Polynesia, Tuamotu, Fangataufa atoll • ♀, 34.0 × 25.0 mm; R / V Marara; st. CAS 231; 22 ° 12.0 ’ S, 138 ° 45.9 ’ W; trap on outer reef at 270 m; coll. J. Poupin; 21. V. 1990; MNHN-IU- 2008 - 11331 (= MNHN B 24312) (wrong number citation in the original description). French Polynesia, Austral Islands, Neilson reef • ♀, c. 35 × 26 mm; R / V Alis; BENTHAUS Expedition; st. CAS 1916; 27 ° 00 ’ 17.9964 ” S, 146 ° 03 ’ 35.9928 ” W; trap at 180 m; coll. B. Richer de Forges et al.; 11. XI. 2002; MNHN-IU- 2021 - 9555 (= MNHN-B 30903).	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFCED61D6E3F7FA04.taxon	materials_examined	Paratype. Philippines, Bohol and Sulu Seas, Balicasag Island • 1 ♀, 26.1 × 21.4 mm; Panglao 2004 Expeditions; st. T 38; 9 ° 32 ’ 17.9988 ” N, 123 ° 42 ’ 18.0072 ” E; probably tangle nets around 200 m (indication in station data as ‘ Pelagic trawl, 80 - 140 m’ is an error, according to B. Richer de Forges (comm. pers. May 2025); 4. VII. 2004; MNHN-IU- 2013 - 14509 (= MNHN-B 31885).	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	description	(Figs 1; 2; 3; 4; 5 A, B; 6) urn: lsid: zoobank. org: act: 3547120 B- 63 F 3 - 403 D- 9 B 33 - E 875 D 7 BBFA 99	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	materials_examined	TYPE MATERIAL. — Holotype. Guadeloupe • ovigerous ♀, 37.4 mm (42.9 including rostrum) × 33.7 mm; off Bouillante; approximately 16 ° 08 ’ N, 61 ° 48.8 ’ W; 310 m depth; coll. local fishermen, end of 2024; trap on rocky bottom; donated by Bertrand Couppey; MNHN-IU- 2025 - 8002.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	etymology	ETYMOLOGY. — The new species is named (as a noun in apposition) in honor of its donator, Bertrand Couppey. A passionate enthusiast of shellfish, Bertrand Couppey regularly acquired specimens from fishermen returning from trap-fishing operations in Guadeloupe. Initially focused on shellfish, he soon became captivated by the remarkable diversity and beauty of the accompanying crustaceans, which led him to begin collecting them as well. Through this hobby, he obtained the striking specimen of Yaldwynopsis studied in the present work. Upon its identification as a member of Yaldwynopsis – a genus previously unrecorded in the Atlantic – he generously donated the specimen to the MNHN collection, enabling further observation and ultimately leading to the description of a new species.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	diagnosis	DIAGNOSIS. — Carapace with rostrum acute, tapering distally, subequal in length to pseudorostral, supraorbital, antennal, and proepistomial spines. Four protogastric spines, slightly shorter than rostrum, positioned at corners of square. Main anterolateral spine strong, obliquely pointing forward, followed by four posterolateral spines decreasing in size posteriorly. Subhepatic region with five strong spines; hepatic region with three spines. Buccal spine strong. Cheliped merus, carpus, and propodus with seven longitudinal rows of spines; dorsomesial and ventromesial rows with longest spines, incurved; number of dorsomesial and ventromesial spines being: on merus, 11 (dorsomesial) and 10 - 11 (ventromesial); on carpus, six (dorsomesial) and five (ventromesial); on propodus, 7 - 8 (dorsomesial), and nine (ventromesial). Dactylus of chelae with two basal dorsomesial spines, and two smaller accessory spines, mesial, near articulation; fixed finger with two basal ventromesial spines. Ambulatory legs (P 2 - P 4) long, slender, subequal, overreaching tip of chelipeds by approximately half their dactyli. Dorsal margins of meri each with eight spines on P 2, nine spines on P 3, and eight spines on P 4, plus sharp distodorsal tooth on each anterior margin. Ventral margins of meri with 7 - 11 main spines, larger distally, P 2 having 11 spines, clearly more spinose than P 3 - P 4. Dactyli of P 2 - P 4 with 18 or 19 acute mobile spines. P 5 slender, situated in dorsal position; merus with dorsal margin unarmed except for a strong distodorsal spine, on anterior margin; ventral margin with four spines; lateral face with a basal spine; dactylus and propodus forming a prominent subchelate structure.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	biology_ecology	HABITAT. — Rocky and steep substrates, mainly accessible by traps; captured with Majoidea Samouelle, 1819 crabs, Minyorhyncha crassa (A. Milne-Edwards, 1878) and Stenocionops coelatus (A. Milne-Edwards, 1878).	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	distribution	DISTRIBUTION. — Known only from Guadeloupe Island, 310 m depth. Likely common in deep waters of the Lesser Antilles, but not accessible to standard sampling gear such as dredges or trawls.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	description	DESCRIPTION Carapace (Figs 1; 2) Carapace densely spiny, 37.4 (42.9 including rostrum) × 33.7 mm, surfaces covered with short tomentum. Rostrum [r] 5.5 mm long, subequal to longest spines on carapace, with dorsal gutter, posteriorly flanked by two pseudorostral spines [pr] of similar length. Frontal carapace with one proepistomial spine [pe], as long as rostrum, tapering. Buccal cavity with lateral margins smooth, unarmed; anterolateral angle with one strong buccal spine [b], subequal in length to rostrum. Protogastric area with four spines [pg] positioned at corners of square, anterior one slightly shorter. Hepatic area with two long spines [h] and smaller one, posteriorly, near cervical groove. Metagastric area with two small spines [m], disposed in longitudinal line, with bifid apices. Subhepatic area (anterolateral) inflated, bearing five long spines [sh]. Cervical groove [cg] deep, situated at midlength of carapace. Posterior carapace armed, just behind posterior groove, with: two small median cervical spines [c], set transversally; one mesobranchial spine [mb]; and one long antero lateral spine [al], pointing slightly forward, with smaller accessory spine [ala] laterally at base. Branchial groove well marked armed posteriorly with five epibranchial spines, three superior (laterodorsal) [es] subequal spines, and two inferior (lateroventral) [ei], ventralmost longest. Posterodorsal surface of carapace resembling a ‘ human mask’, composed of: two cardiac ovate pits [cop]; a posterocardiac [pc] median bump, bearing two transverse tubercles; and three median tubercles near posterior margin, median one with small intestinal spine [i]. Linea homolica [lh] feebly marked laterally. Posterolateral margin of carapace rounded, armed with four posterolateral spines [pl] decreasing in size posteriorly. Posterolateral surface with scattered low spines and tubercles [sls]. Posterior margin of carapace sinuous, tuberculate, posteromedian tubercles slightly spinose. Eyestalks, antennules and antennae (Fig. 2 C) Eyestalks about twice as long as rostrum; basophtalmite thin, tubular; podophtalmite stouter, subequal in length. Cornea dilated, rounded. Eye not housed in orbital cup. One supraorbital [so] and one antennal spine [a], subequal to rostrum. Antennule (c. 18 mm in length, including flagellae), peduncle subequal to that of antenna; basal article bulbous; second (7.3 mm) and third (5.8 mm) articles tubular, unarmed; two distal flagellae, unequal (longest c. 3.3 mm). Antenna c. 30 mm in length (including flagellum) moderately long, inserted near antennal spine; basal article bulbous, with large urinary pore; second article (3.8 mm) with one distal spine; third article (8.2 mm), unarmed, tubular, overreaching rostral spine by most of its length; terminal article short (1.8 mm); flagellum c. 16 mm in length, overreaching tip of mxp 3, when fully extended. Third maxilliped (Fig. 3 A) Third maxilliped (length c. 38 mm), reaching almost to distal margin of cheliped merus when fully extended. Ventrolateral and ventromesial margins armed with several long spines. Mesial margins of each article lined with long yellow setae. Coxa with one strong distoventral spine and an additional spine, at base of exopod. Exopod (length 12.4 mm) tubular, reaching proximal third of mxp 3 merus; ventral surface with row of low tubercles; flagellum curved. Basis poorly defined, unarmed. Ischium (length 9.6 mm, including basis), armed with irregular row of four ventromesial spines; with straight row of four ventrolateral spines, increasing in size distally; with comblike row of 7 - 9 spines on mesial margin, obscured by yellow setae in ventral view. Merus (length 10.1 mm) weakly curved; with irregular row of five unequal ventromesial spines; with straight row of five long curved ventrolateral spines. Carpus short (length 3.2 mm), rounded, unarmed. Propodus (length 6.8 mm) with straight row of three long ventrolateral spines. Dactylus (length 8.5 mm) slightly longer than propodus, terminating bluntly, fully covered in long setae, without tubercles or movable spines. Cheliped (Figs 1; 3 B, C) Cheliped (total length c. 115 mm) approximately × 3 cl (excluding rostrum), × 0.8 the length of the longest pereiopod (P 3, length c. 143 mm). All surfaces covered with scattered long setae and armed with seven longitudinal rows of long spines; longest spines situated on dorsomesial rows [dmr] on the ischium, merus, carpus, palm, and base of dactylus (Fig. 3 B). Coxa bearing one acute spine on dorsomesial margin; anteroventral margin with 4 - 6 small spines, near each articulation. Ischium triangular in cross-section, with longitudinal rows of spines; one dorsomesial row of four spines (the distal one on anterior margin, at articulation), and one ventromesial row of five spines (including one spine on the basis); mesial surface between dorsomesial and ventromesial rows smooth; one dorsal row with two spines (the distal spine on the anterior margin), as well as one lateral row of two spines (the distal one on the anterior margin, at the articulation), plus a few spiny tubercles on the lateral surface; the anterior margin bearing two additional spines: one dorsal (between the articulations knobs), and one mesial. Merus (length 40.1 mm) triangular in cross-section, slightly shorter than chela (51.7 mm), armed with seven longitudinal rows of spines: longest spines incurved, situated on dorsomesial [dmr; 11 spines] and ventromesial [vmr; 10 - 11 spines] rows; one mesial row [mr] of 10 shorter spines present between these dorsomesial and ventromesial rows. Dorsal row [dr] with nine or 10 spines, increasing in size distally, nearly aligned with one strong dorsodistal spine on anterior margin. Lateral row [lr] with nine spines. Lateroventral face with two subparallel rows of 9 - 11 spines, upper row more laterally positioned. Anterior margin with three main spines: one dorsal and two ventral, positioned at articulation knobs. Carpus (length 23.4 mm), with seven main longitudinal rows of spines continuous with those of the merus; dorsomesial and ventral mesial rows bearing prominent, long spines; one dorsomesial row with six spines, four of which are long (longest c. 10 mm); one ventromesial row with three main spines and two smaller intercalated spines; one mesial row of four shorter spines situated between dorsomesial and ventromesial rows; one dorsal row with 10 or 11 spines, aligned distally with one strong terminal spine on the anterior margin, at articulation knob; three additional spines present on the distodorsal surface, between dorsomesial and dorsal rows; one lateral row with eight spines; lateroventral surface with two subparallel rows, upper row with six or seven spines aligned with one strong distoventral spine on anterior margin, lower row with five or six spines. Palm of chela (length 27.7 mm), longer than dactylus (24.0 mm), lateral face covered with scattered long setae; armature consisting of seven main longitudinal rows of spines, continuous with those on the merus and the carpus; dorsomesial and ventromesial rows bearing the longest spines; dorsomesial row with seven or eight spines (one broken), continuing distally with two additional spines at base of dactylus; ventromesial row with nine spines, continuing distally with two additional spines at base of fixed finger; mesial row, between dorsomesial and ventromesial rows reduced to one short proximal spine and few indistinct tubercles on proximal half of mesial surface; dorsal row with 10 spines, aligned distally with one strong distodorsal spine on anterior margin; an intermediate row of four spines between dorsomesial and dorsal rows; lateral row with 10 or 11 short spines; two lateroventral rows of short spines: upper row (more lateral) with 10 or 11 spines; lower row (more ventral) with 14 - 16 acute spines; anterior margin with one dorsal spine at articulation, and one ventromesial spine at base of fixed finger; no conspicuous patch present on either the inner or outer face of the palm at base of fixed finger. Dactylus (length 24 mm; left regenerating) bearing long setae, blade-like, inwardly curved, with smooth cutting edges and terminating in sharply curved claw. Two prominent dorsomesial spines present at base (Fig. 3 B), aligned with dorsomesial spines on palm; two additional smaller accessory spines located on mesial face near articulation; fixed finger similar in shape to dactylus, with two ventromesial spines (Fig. 3 C) aligned with ventromesial spines of palm. Ambulatory legs (Figs 1; 4 A-E) Ambulatory legs extremely long and slender, with all articles very thin. P 2 and P 4 subequal in length (140.8 mm and 140.6 mm, respectively), with P 3 slightly longer (143.4 mm), extending beyond cheliped tip by distal two-thirds of dactylus. P 5 distinctly reduced (length 67.4 mm), very thin, inserted dorsally. P 2 - P 4 coxae bearing two dorsomesial spines of unequal size on each anterior margin. Ischia with one single mediodorsal spine on each anterior margin; ischium of P 2 additionally with a longitudinal row of two spines on ventral margin, absent on P 3 and P 4. Meri of P 2 - P 4 subequal in length (53.4 - 53.9 mm) with scattered long setae; dorsal margins with eight (P 2, P 4) or nine (P 3) strong spines, aligned with one prominent dorsodistal spine on the anterior margin; ventral margins with 11 (P 2), eight (P 3), 7 - 10 (P 4) spines, larger distally; on proximal third presence of additional rows of spinules on mesial and lateral faces. Carpi approximately half the length of the meri, subcylindrical, unarmed, and densely covered with short setae. Propodi about 0.6 times length of meri, also densely setose, slightly compressed mesiolaterally, armed distoventrally with three acute mobile spines, distalmost spine located on anterior margin with an accessory mesial spinule. Dactyli approximately 0.4 times meri length, covered with scattered long setae, conspicuously flattened, with longitudinal furrows on mesial and lateral faces. Ventral margins armed with 18 or 19 acute mobile spines, terminating in one strongly incurved distal claw. P 5 slender, approximately half length of P 2 - P 4, inserted dorsally, densely setose, with short and scattered long setae. Coxa unarmed. Ischium bearing two distal spines. Merus (length 33.7 mm) subcylindrical; dorsal margin unarmed except for one strong distal spine on anterior margin; ventral margin with four main spines; lateral face with one basal spine implanted before insertion of basal-most spine on ventral margin. Carpus (length 21.8 mm) about 0.65 times length of merus, subcylindrical, unarmed. Propodus and dactylus forming a prominent subchelate structure (Fig. 4 D-E); propodus distoventral margin armed with two subparallel rows of 5 - 7 sharp spines; dactylus with seven or eight mobile spines along ventral margin, increasing in size distally. Thoracic sternum and spermatheca (Fig. 5 A) Thoracic sternum with sternites 1 and 2 fused, resulting in only seven visible sternites. Sternites 4 - 6 the largest and subequal in size (median height × width at base c. 4 × 12 mm). Female genital openings typical of the Homoloidea, as described by Guinot (1979: 174). Gonopores [go] located at base of coxae 3, forming a circular orifice (diameter c. 0.6 mm) surrounded by a thickened rim. Spermathecae [sp] situated on sternite 7, near junction with sternite 8, elliptical in shape (c. 3.3 × 1.6 mm). No locking mechanism. Female pleon (Fig. 5 B) Female pleon (length fully extended c. 44 mm) ovate, totally covering sternal surface, margins with setae. Telson subtriangular 10 × 10 mm (mh × bw), with rounded tip. Somite 6 8.6 × 19 mm (mh × bw) with one median acute spinule on distal half [sp 6]. Somite 5 8.6 × 20.2 mm (mh × bw) where the pleon reaches its maximum width (22.3 mm at mid-height). Somites 4 - 2 progressively decreasing in size; somite 2 with one blunt median tubercle [sp 2]. Somite 1 smallest (mh × bw 2 × 8 mm), subrectangular. Eggs diameter c. 0.4 mm. Coloration (in freshly preserved specimen) Carapace, chelipeds and legs light orange; dactyli black. Rostrum and main spines of the carapace deep red. Basal article of antennule and antenna deep red; antennal flagellum red. Eyestalks cream, cornea black. The longest spines on the cheliped, arranged in dorsomesial and ventromesial rows, white distally, pale orange proximally, each with red ring medially. Eggs deep red.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFC126345E373F81F.taxon	discussion	REMARKS The specimen from Guadeloupe conforms to all key diagnostic characters of the genus Yaldwynopsis as outlined in Guinot & Richer de Forges (1995: 318) and Ahyong et al. (2009: 75), including: 1) carapace (dorsal and lateral surfaces) and appendages densely covered with spines; 2) rostrum, and pseudorostral spines simple, acute; 3) pseudorostral spines as long as rostrum; 4) eyes elongated, free, not enclosed in orbital cup; 5) third maxilliped (mxp 3) pediform; 6) palm of cheliped lacking a conspicuous patch on inner and outer surfaces near base of the fixed finger; 7) ambulatory legs (P 2 - P 4) long, slender, subequal; 8) fifth pereiopod (P 5) merus slender, more than 16 times as long as wide, shorter (length 33.5 mm) than carapace length including rostrum (length cl + rostrum 42.9 mm), not reaching to level of orbit. In addition to these features, the presence of conspicuous dorsomesial and ventromesial rows of long spines on the merus, carpus, and palm of the cheliped are characteristic of Yaldwynopsis species.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFE9C61C3E31FF96C.taxon	type_taxon	TYPE SPECIES. — Paromola spinimanus Griffin, 1965.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
1E469946FFC0FFCBFE9C61C3E31FF96C.taxon	distribution	TYPE LOCALITY. — New Zealand.	en	Poupin, Joseph (2026): First occurrence of the genus Yaldwynopsis Guinot & Richer de Forges, 1995 in the Atlantic Ocean, Guadeloupe Island, with description of a new species (Crustacea, Decapoda, Brachyura, Homolidae). Zoosystema 48 (14): 361-371, DOI: 10.5252/zoosystema2026v48a14
