Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea) Author Ng, Peter K. L. Author Castro, Peter text Zootaxa 2016 4209 1 1 182 journal article 37321 10.11646/zootaxa.4209.1.1 2de5b7bf-3975-458a-b200-07ec69f4e013 1175-5326 272646 849BAB5C-464A-4B4A-A586-5742411EDC01 Statommatia malagasy n. sp. ( Figs. 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 . 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 ; 1 paratype male (6.7 × 8.2 mm ), 2 paratype females ( ZRC 2015.215 ), stn CP3583, 25°31’S , 44°16’E , south Madagascar , 296‒302 m , 10.05.2010 ; 1 paratype ovigerous female (6.9 × 8.6 mm ) ( ZRC 2015.265 , ex MNHN-IU-2014-17792), south of Point Barrow , stn DW3582, 25°32’S , 44°16’E , south Madagascar , 10.05.2010 .— 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 . Diagnosis . Carapace ( Fig. 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 C) filling orbit, short, immobile; cornea reduced, with reduced pigmentation. Posterior margin of epistome ( Fig. 26 C) with semicircular median lobe with deep median fissure, semicircular lateral margins. Third maxilliped ( Fig. 33 E) merus subquadrate, ischium subrectangular, slightly longer than merus. Proportionally short ambulatory legs ( Fig. 16 E, F); P5 merus 0.7 cl. Chelipeds ( Figs. 16 E, F; 45G, H) subequal in length, slightly dissimilar in females, heteromorphic in males; fingers of minor chela ( Fig. 45 H) subcircular in cross-section, scissor-like, cutting margins with small teeth; dactylus of major chela of males ( Fig. 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 N). Inner margin of cheliped carpus with short distal tooth ( Fig. 16 E, F). Fused thoracic sternites 1, 2 ( Fig. 54 C) semicircular, broad, long. Male pleon ( Figs. 54 C; 61C) with proportionally short telson. G1 ( Fig. 77 I‒K) slender, slightly curved, with short spinules. G2 ( Fig. 77 L) about 1/2 G1 length, curved, slender, distal segment proportionally short. Female telson ( Fig. 88 B) proportionally long. Sterno-pleonal cavity of female ( Fig. 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 E, F) (relatively more slender and longer in S. apta , Fig. 16 A‒C), somite 6 of the male pleon is more quadrate, being not much wider than long ( Fig. 54 C) (rectangular, being distinctly wider than long in S. apta ; Fig. 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 I‒K) (relatively stouter and shorter in S. apta , Fig. 77 A‒C). Their known ranges are widely separated, with S. malagasy n. sp. in Madagascar and S. apta in Philippines . Distribution . Known only from Madagascar . Depth: 296‒ 379 m .