Carcinoplax jugum, Ng & Castro, 2020

Ng, Peter K. L. & Castro, Peter, 2020, A revision of Carcinoplax abyssicola (Miers, 1885) and seven related species of Carcinoplax H. Milne Edwards, 1852, with the description of two new species and an updated key to the genus (Crustacea, Decapoda, Brachyura, Goneplacidae), Zoosystema 42 (17), pp. 239-284: 272-275

publication ID

http://doi.org/ 10.5252/zoosystema2020v42a17

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:52C73176-6867-4415-A6FA-BAD328E9781D

DOI

http://doi.org/10.5281/zenodo.4525515

persistent identifier

http://treatment.plazi.org/id/AF26AE84-ADE8-4F9A-9A41-BA26DEAFE781

taxon LSID

lsid:zoobank.org:act:AF26AE84-ADE8-4F9A-9A41-BA26DEAFE781

treatment provided by

Felipe

scientific name

Carcinoplax jugum
status

n. sp.

Carcinoplax jugum   n. sp.

( Figs 21 View FIG A-I; 22 View FIG A-J; 25 View FIG Q-T)

urn:lsid:zoobank.org:act:AF26AE84-ADE8-4F9A-9A41-BA26DEAFE781

TYPE MATERIAL. — Holotype. Philippines • ♂, 45.5 × 33.6 mm; Philippines ; ZRC 2004.0777 View Materials .  

Paratypes. Philippines • 1 ♀, 25.7 × 33.8 mm; Bohol, Balicasag I., off Panglao I., tangle nets of local fishermen; 09°31’00.2”N, 123°40’50.5”E; 28.XI.2001; ZRC 2001.0528 View Materials GoogleMaps   1 ♂, 24.2 × 32.8 mm; same location as ZRC 2002.0528; 50-500 m depth; ZRC 2001.0973 View Materials GoogleMaps   3 ♀, 23.3 × 31.4 mm, 24.9 × 33.4 mm, 27.0 × 35.7 mm, 3 ♂, 13.8 × 19.6 mm, 13.9 × 19.9 mm, 17.2 × 22.2 mm; same location as ZRC 2002.0528; 25-30.VII.2003; ZRC 2004.0750 View Materials GoogleMaps   1 ♀, 4 ♂, largest 35.9 × 48.4 mm, smallest 13.6 × 18.9 mm; same location as ZRC 2002.0528; 25-30. VII.2006; ZRC 2001.0845 View Materials GoogleMaps   2 ♀, 23.9 × 30.5, 26.8 × 35.3 mm; same location as ZRC 2002.0528; ZRC 2004.0730 View Materials GoogleMaps   6 ♀, largest 31.7 × 41.4 mm; same location as ZRC 2002.0528; 200-300 m depth; ZRC 2002.0655 View Materials GoogleMaps   1 ♀, 25.1 × 32.5 mm; PANGLAO 2005, stn CP2343, off Pamilican I.; 09°27.4’N, 123°49.4’E; 273-356 m depth; 23.V.2005; ZRC 2006.0217 View Materials GoogleMaps   2 ♂, 38.5 × 50.5, 41.4 × 63.0 mm; Maribohoc Bay ; coll. J. Arbasto, VII.2004 to. V.2005; ZRC 2018.1432 View Materials   1 ♀, 26.8 × 35.2 mm, 1 juvenile ♀, 11.0 × 14.2 mm; PANGLAO 2005, stn CP2359, Bohol Sea; 08°49.9’N, 123°34.9’E; 437-476 m depth; 26.V.2005; ZRC 2018.1433 View Materials GoogleMaps   1 juvenile ♀, 13.8 × 18.0 mm; PANGLAO 2005: stn CP2406, Maribohoc Bay , 9°40.6’N, 123°46.8’E; 334-387 m depth; 1.VI.2005; ZRC 2018.1434 View Materials GoogleMaps   1 ♀, 30.0 × 40.2 mm, 1 ♂, 23.7 × 31.4 mm; PANGLAO 2005, stn PN1, tangle nets; 09°31’00.2”N, 123°40’50.5”E; 29.V.2004; ZRC 2004.0777 View Materials GoogleMaps   .

TYPE LOCALITY. — Philippines, Bohol, Balicasag I., off Panglao I.; PANGLAO 2004, stn P4, tangle nets of local fishermen.

DIAGNOSIS. — Carapace ( Figs 21A, B View FIG ; 22A, B View FIG ) quadrate, slightly wider than long (1.3 × wider than long in holotype); slightly convex, marked by two distinct transverse elevations across cardiac, gastric regions. Front ( Figs 21C, D View FIG ; 22C, D View FIG ) slightly sinuous, slight oblique notch between front, inner edge of supraorbital border. Conspicuous, salient ocular margins, subocular tooth. Triangular, elevated tooth on outer orbital angle; two slender, acute-tipped anterolateral teeth on each side of carapace. Short granules on subhepatic, pterygostomial regions ( Figs 21C, D View FIG ; 22C, D View FIG ), becoming more pronounced in pterygostomial crest, ridge. Posterior margin of epistome ( Figs 21D View FIG ; 22D View FIG ) sinuous, with median salient tip, lateral margins wide, concave. Distal third to half of fingers dark brown in females ( Fig. 22I, J View FIG ), males (21A, I, J). Inner (ventral), distal margin of cheliped carpus ( Figs 21F, D View FIG ; 22F View FIG ) with long, slender, acute-tipped tooth. P2-P5 long, slender in appearance. Male pleon ( Fig. 21H View FIG ) proportionally narrow. G1 ( Fig. 25 View FIG Q-S) slender; conspicuously pointed tip; G2 ( Fig. 25T View FIG ) slender, nearly equal or slightly longer than G1, slightly curved flagellum, tip with two lateral spinules.

ETYMOLOGY. — From the Latin jugum   for ‘yoke’; in reference to the diagnostic yoke-like, wide, and prominently concave lateral margins of the posterior margin of the epistome. Used as a noun in apposition.

COLOUR IN LIFE. — Not known.

GEOGRAPHICAL DISTRIBUTION. — Philippines.

DEPTH. — Present in samples collected at depths of approximately 50-500 m (273-476 m where depths were more accurately measured).

REMARKS

See Remarks for C. polita   .

It is noteworthy that most of the specimens of C. jugum   n. sp. collected were obtained from tangle nets set on steep deep-sea cliffs, a habitat which is hard to survey (see Ng et al. 2009; Mendoza et al. 2010). This probably explains the paucity of specimens of this species from trawled material in earlier expeditions to Philippines.