Tenagopelta brachyphallus, Ng, Peter K. L. & Castro, Peter, 2016

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182 : 82

publication ID

https://doi.org/ 10.11646/zootaxa.4209.1.1

publication LSID

lsid:zoobank.org:pub:849BAB5C-464A-4B4A-A586-5742411EDC01

DOI

https://doi.org/10.5281/zenodo.5617193

persistent identifier

https://treatment.plazi.org/id/F16BFB33-FFF2-FFAA-FF6A-FD99FC2BF8CD

treatment provided by

Plazi

scientific name

Tenagopelta brachyphallus
status

sp. nov.

Tenagopelta brachyphallus View in CoL n. sp.

( Figs. 17 View FIGURE 17 C, D; 26G; 33H; 47C, D; 54G; 61F; 79F‒J; 88D; 91H)

Type material. Holotype male (6.1 × 6.9 mm) ( NMV J61680 View Materials ) [photographed], Western Australia, “ Chasmocarcinops, det. A. McCallum 2009 ”), L23 west transect , Western Australia, 17°31’03”S –17°31’43”S to 118°51’10”E–118°50’44”E, 405 m, M.F. Gomon coll., 16.06.2007.

Paratypes: 1 male (6.9 × 7.6 mm) (NMV J54594 View Materials ); 3 females (6.9 × 7.6 mm, 5.2 × 5.6 mm, 7.4 × 8.1 mm) ( NMV J54594 View Materials ) [“ Camatopsis rubida , det. C.G.B. Poore 2006”], Western Australia, off Ningaloo North , 21°58’42”S, 113°49’12”E to 21o59’03”S, 113o49’12”E, 170–177 m, 10.12.2005 GoogleMaps ; 1 female (6.9 × 7.6 mm) [photographed], 2 females (5.2 × 5.6 mm, 7.4 × 8.1 mm) (NMV J61680 View Materials ) [“ Chasmocarcinops, det. A. McCallum 2009 ”], L23 west transect, 17o31’03”S, 118o51’10”E to 17o31’43”S, 118o50’44”E, 405 m, M.F. Gomon coll., 16.06.2007.

Diagnosis. Carapace ( Fig. 17 View FIGURE 17 C, D) subtrapezoidal, globose, 1.1 wider than long; front bilobed, with shallow median cleft; anterolateral margins arcuate, minutely granular, low tubercle on each anterolateral margin in holotype, small individuals (absent in large specimens). Eye peduncle ( Fig. 26 View FIGURE 26 G) tightly filling orbit, short, mobile; cornea reduced, pigmented. Posterior margin of epistome ( Fig. 26 View FIGURE 26 G) with broad semicircular median lobe with deep median fissure, semicircular lateral margins. Third maxilliped ( Fig. 33 View FIGURE 33 H) merus quadrate, ischium rectangular, about same length as merus. Chelipeds ( Figs. 17 View FIGURE 17 C, D; 47C, D) subequal in length, slightly dissimilar in females, heteromorphic in males; fingers of minor chela ( Fig. 47 View FIGURE 47 D) subcircular in cross-section, not distinctly laterally flattened, gently tapering to tip, scissor-like, cutting margins with distinct sharp teeth; major chela of males ( Fig. 47 View FIGURE 47 C) with most proximal dactylar tooth enlarged. Ventral surface of cheliped merus with 3 large teeth (sometimes additional small teeth or large tubercles) on outer margin in both sexes. Inner margin of cheliped carpus with long distal tooth ( Fig. 17 View FIGURE 17 C, D). Proportionally long ambulatory legs ( Fig. 17 View FIGURE 17 C, D); P5 merus 0.8 cl. Meri of P2, P3 with minute teeth. Fused thoracic sternites 1, 2 ( Fig. 54 View FIGURE 54 G) semicircular, broad, short. Male pleon ( Figs. 54 View FIGURE 54 G; 61F) with proportionally short telson. G1 ( Fig. 79 View FIGURE 79 F‒I) short, stout, distal half short, stout straight, with short spinules; tip sharp. G2 ( Fig. 79 View FIGURE 79 J) longer than G1, curved, slender, distal segment long, curved. Female telson ( Fig. 88 View FIGURE 88 D) proportionally short. Sterno-pleonal cavity of female ( Fig. 91 View FIGURE 91 H) deep, vulvae widely separated on outer margins of cavity close to suture 5/6.

Etymology. The name alludes to the relatively short G1 of the species. The name is used as a noun in apposition.

Remarks. Specimens of T. brachyphallus n. sp. were collected from waters that are shallower (about 400 m) than its two congeners.

There is slight variation in the five specimens. In the holotype, paratype male and one paratype female (6.9 × 7.6, NMV J61680 View Materials ), there is a short but distinct tooth on each anterolateral margin. This tooth is strongly reduced in a small paratype female (5.2 × 5.6 mm, NMV J61680 View Materials ) and completely absent in the largest paratype female (7.4 × 8.1 mm, NMV J61680 View Materials ).

Distribution. Known only from Western Australia. Depth: 170– 405 m.

NMV

Museum Victoria

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