Hexaplax saudade, Rahayu & Ng, 2014
publication ID |
https://doi.org/ 10.5281/zenodo.5353945 |
publication LSID |
lsid:zoobank.org:pub:4CF42744-861A-4635-9703-E6639CEBFAA9 |
persistent identifier |
https://treatment.plazi.org/id/64CF39E2-D2DA-49A7-9DBA-544FE12EB756 |
taxon LSID |
lsid:zoobank.org:act:64CF39E2-D2DA-49A7-9DBA-544FE12EB756 |
treatment provided by |
Tatiana |
scientific name |
Hexaplax saudade |
status |
sp. nov. |
Hexaplax saudade View in CoL , new species
( Figs. 2G, H View Fig , 56D View Fig , 57D View Fig , 58D View Fig , 59G, H View Fig , 60C View Fig , 61B View Fig , 65 View Fig , 66 View Fig )
Hexaplax megalops View in CoL – Serène, 1964: 270, text fig. 21, pl. 24A; Sakai, 1965: 40, 45, pl. 6 fig. 8; Sakai, 1976: 556, pl. 196 fig. 4; Ng et al., 2008: 86 (part), fig. 78. (not Hexaplax megalops Doflein, 1904 View in CoL )
Material examined. Holotype: male (16.4 × 12.1 mm) ( NMCR), station CP 2660, 15°52.2'N 121°48.8'E, 542 m, Philippines, coll. AURORA 2007 Expedition , 20 May 2007 GoogleMaps . Paratypes: Philippines: 3 males (11.6 × 8.2 mm, 14.8 × 10.5 mm, 18.2 × 13.2 mm) , 3 females (14.3 × 10.8 mm, 14.6 × 10.6 mm, 16.9 × 9.8 mm, 18.6 × 13.6 mm) ( ZRC 2013.1692 View Materials ) , 3 males (13.6 × 9.7 mm, 15.3 × 11.2 mm, 17.2 × 12.0 mm), 2 females (15.2 × 11.1 mm, 15.8 × 11.7 mm) ( MNHN), station CP 2658, 15°58.03'N 121°49.11'E, 422 m, coll. AURORA 2007 Expedition , 20 May 2007 GoogleMaps ; 1 male (16.4 × 12.1 mm), 1 female (11.4 × 8.0 mm) ( ZRC 2013.1693 View Materials ), station CP 2660, 15°52.2'N 121°48.8'E, 542 m, coll. AURORA 2007 Expedition , 20 May 2007 GoogleMaps ; 1 male (17.9 × 12.7 mm), 2 females (16.6 × 12.3 mm, 13.1 × 9.7 mm) ( ZRC 2013.1694 View Materials ), station CP 2735, 15°59.52'N 121°50.93'E, 431 m, coll. AURORA 2007 Expedition , 1 June 2007 GoogleMaps . Others: Taiwan: 1 male (15.9 × 11.1 mm) ( ZRC 2008.1456 View Materials ), Su- Ao fish port, Ilan province , trawled, deep-sea, coll. C.-W. Lin, 29 July 2004 . Japan: 1 male (15.1 × 11.6 mm) (NSMT-Cr 13586), Tosa Bay , 400 m, coll. Kotaka Maru, M. Takeda, 9 May 2000 .
Diagnosis. Carapace subquadrate ( Fig. 65A View Fig ), about 1.4 times as broad as long, dorsal surface very finely granulated; regions indistinct, median H-shaped depression shallow. Anterolateral margin arcuate; posterolateral corner with small angle over base of posterior pereopods. Front not deflexed (Fig. and 56D), divided into 2 lobes, not projecting beyond distal edge of orbits. Orbit distinct, transverse; eye movable, large, corneas dilated, pigmented, much wider than peduncle ( Fig. 56D View Fig ). Pterygostomial region with oblique stridulatory ridge consist of long row of 24 short, widely-spaced striae, including ca. 14 shorter, less produced striae adjacent to epistome ( Fig. 60C View Fig ); shallow oblique groove above ridge. Third maxillipeds broad ( Fig. 66A View Fig ), not covering buccal cavity, with gap when closed; ischium longer than broad, longer than merus, with scattered granules, dilated distally, mesial margin rounded; merus squarish, as long as broad; dactylus longer than propodus; exopod relatively narrow, less than 0.3 width of ischium; flagellum well developed. Chelipeds subequal ( Fig. 57D View Fig ); major chela with slight gap when fingers closed; with large teeth at cutting edge of dactylus and fixed finger; outer surface of dactylus with 2 longitudinal ridges; inner surface near upper margin with longitudinal ridge; palm longer than wide, outer surface finely granulated; fixed finger with 2 longitudinal ridges; lower margin with row small teeth continuing to lower margin of palm; carpus finely granulated on outer surface, inner angle blunt, upper margin with row of small tubercles obscured by short setae, long setae on outer angle; merus short, row of denticles on outer and inner lower margins, fringe of setae dorsomesially. Minor chela without gap when fingers closed; ornamentation similar to that of major chela. P2–P4 long, slender ( Fig. 65 View Fig ); outer surface finely granulated; merus of P4 about 7 times as long as broad ( Fig. 59G, H View Fig ). Male thoracic sternum broad ( Fig. 58D View Fig ), surface finely granular; sternites 1 and 2 fused, separated from sternite 3 by distinct ridge; sternite 3 not separated from sternite 4, sternites 4–7 well developed, separated by distinct sutures; sternoabdominal cavity reaching middle of sternite 4, no thoracic sternal groove; sternite 8 exposed, triangular, reaching half length of male abdominal somite 2. Male abdomen relatively narrow ( Figs. 58D View Fig , 66B View Fig ); somite 1 hidden under carapace; somite 2 free, somites 3–5 fused, lateral margin sinuous; somite 6 wider than long, lateral margin slightly expanded subproximally; telson rounded, as long as somite 6. Female abdomen not much wider than male ( Fig. 66E View Fig ), 6 free somites and telson, first somite hidden under carapace. G1 ( Fig. 66C, D View Fig ) concealed under abdomen, straight, distal part tapered, sparse short setae present in proximal half, small spinules on mesial margin medially.
Colour. In life, the carapace is light brown with a tinge of orange or orangish-brown medially. The cheliped transparent white with an orange line at the articulation of the dactylus and palm; P2–P4 transparent are whitish on the dactylus, propodus and carpus; with the merus light brown tinged of orange distally ( Fig. 2G, H View Fig ).
Etymology. The species name is derived from the Portuguese word “saudade” which means a melancholic longing for something that cannot exist or be realised; alluding to the long-held belief that Hexaplax was a monotypic genus. The name is used as a Latin noun in apposition.
Remarks. See remarks for H. megalops s. str. for differences with congeners.
The records of “ Hexaplax megalops ” from Philippines ( Serène, 1964; Ng et al., 2008) and Tosa Bay in Japan ( Sakai, 1965; Sakai, 1976) are clearly Hexaplax saudade , new species. The figure of a fresh specimen in Sakai (1965, 1976) agrees well with those of the new species from Philippines ( Fig. 2E View Fig ) and Taiwan ( Fig. 2F View Fig ). We have also examined a male specimen from Tosa Bay specimen (NSMT-Cr 13586) which agrees with our definition of H. saudade .
Type locality. Philippine Sea , Philippines .
Distribution. Philippines, Taiwan and Japan. Deep water, 422– 542 m.
NMCR |
New Mexico State University |
MNHN |
Museum National d'Histoire Naturelle |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Hexaplax saudade
Rahayu, Dwi Listyo & Ng, Peter K. L. 2014 |
Hexaplax megalops
Ng PKL & Guinot D & Davie PJF 2008: 86 |
Sakai T 1976: 556 |
Sakai T 1965: 40 |
Serene R 1964: 270 |