Statommatia malagasy, 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 : 77

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.5617179
persistent identifier	https://treatment.plazi.org/id/F16BFB33-FFEF-FFB7-FF6A-FE9DFC69F9F7
treatment provided by	Plazi
scientific name	Statommatia malagasy
status	sp. nov.

Treatment

Statommatia malagasy View in CoL n. sp.

( Figs. 16 View FIGURE 16 E, F; 26C; 33E; 42N; 45G, H; 54C; 61C; 77I ‒L; 88B; 91F)

Type material. Holotype male (9.9 × 12.4 mm) (MNHN-IU-2014-12806), Madagascar, southwest of Point Barrow , ATIMO VATAE, stn CP3590, 25°03’S, 43°59’E, 300‒309 m, 11.05.2010. GoogleMaps

Paratypes: ATIMO VATAE: 3 paratype males (7.7 × 9.2 mm, 8.8 × 11.0 mm, 9.2 × 11.7 mm), 3 paratype females (6.8 × 8.1 mm, 8.3 10.2 × 10.2 mm, 8.1 × 9.4 mm [photographed] (MNHN-IU-2014-4370), southwest of Point Barrow , stn CP3590, 25°03’S, 43°59’E, 300‒309 m, 11.05.2010 GoogleMaps ; 1 paratype male (6.7 × 8.2 mm), 2 paratype females ( ZRC 2015.215 View Materials ), stn CP3583, 25°31’S, 44°16’E, south Madagascar, 296‒302 m, 10.05.2010 GoogleMaps ; 1 paratype ovigerous female (6.9 × 8.6 mm) ( ZRC 2015.265 View Materials , ex MNHN-IU-2014-17792), south of Point Barrow , stn DW3582, 25°32’S, 44°16’E, south Madagascar, 10.05.2010 GoogleMaps .— MIRIKY: 3 paratype females (7.9 × 9.3 mm, 8.0 × 9.3mm, 7.5 × 9.2 mm) (MNHN-IU-2010-1029), Narendry Bay , stn CP3289, 14°29’S, 47°26’E, 332‒379 m, 14.07.2009 GoogleMaps .

Diagnosis. Carapace ( Fig. 16 View FIGURE 16 E, F) subtrapezoidal, convex dorsally, 1.2–1.3 wider than long; front bilobed, with shallow median cleft; anterolateral margins arcuate, minutely granular with granules higher along lateral margins, without distinct lobes or teeth. Eye peduncle ( Fig. 26 View FIGURE 26 C) filling orbit, short, immobile; cornea reduced, with reduced pigmentation. Posterior margin of epistome ( Fig. 26 View FIGURE 26 C) with semicircular median lobe with deep median fissure, semicircular lateral margins. Third maxilliped ( Fig. 33 View FIGURE 33 E) merus subquadrate, ischium subrectangular, slightly longer than merus. Proportionally short ambulatory legs ( Fig. 16 View FIGURE 16 E, F); P5 merus 0.7 cl. Chelipeds ( Figs. 16 View FIGURE 16 E, F; 45G, H) subequal in length, slightly dissimilar in females, heteromorphic in males; fingers of minor chela ( Fig. 45 View FIGURE 45 H) subcircular in cross-section, scissor-like, cutting margins with small teeth; dactylus of major chela of males ( Fig. 45 View FIGURE 45 G) curved, forming wide, round gap when closed, reduced teeth. Ventral surface of cheliped merus with row of 5, 6 large pointed tubercles along outer margin ( Fig. 42 View FIGURE 42 N). Inner margin of cheliped carpus with short distal tooth ( Fig. 16 View FIGURE 16 E, F). Fused thoracic sternites 1, 2 ( Fig. 54 View FIGURE 54 C) semicircular, broad, long. Male pleon ( Figs. 54 View FIGURE 54 C; 61C) with proportionally short telson. G1 ( Fig. 77 View FIGURE 77 I‒K) slender, slightly curved, with short spinules. G2 ( Fig. 77 View FIGURE 77 L) about 1/2 G1 length, curved, slender, distal segment proportionally short. Female telson ( Fig. 88 View FIGURE 88 B) proportionally long. Sterno-pleonal cavity of female ( Fig. 91 View FIGURE 91 F) deep, vulvae relatively close together, located on outer margins of cavity close to suture 5/6.

Remarks. Statommatia malagasy n. sp. is externally similar to S. apta , notably in the form of the carapace and chelipeds. It can be distinguished from S. apta , however, by its proportionally shorter and stouter ambulatory legs, especially the merus ( Fig. 16 View FIGURE 16 E, F) (relatively more slender and longer in S. apta , Fig. 16 View FIGURE 16 A‒C), somite 6 of the male pleon is more quadrate, being not much wider than long ( Fig. 54 View FIGURE 54 C) (rectangular, being distinctly wider than long in S. apta ; Fig. 54 View FIGURE 54 A, B), presence of sharp teeth on the ventral surface of the cheliped meri (low granules in S. apta ), and the G1 is more slender and longer ( Fig. 77 View FIGURE 77 I‒K) (relatively stouter and shorter in S. apta , Fig. 77 View FIGURE 77 A‒C). Their known ranges are widely separated, with S. malagasy n. sp. in Madagascar and S. apta in Philippines.