Camatopsis africana, 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 : 37-39

Camatopsis africana n. sp.

( Figs. 7 A, B; 36A, B; 23C; 30B; 38G‒J; 51B; 58B; 67G‒I; 86B; 90B; 100C, D)

Type material. Holotype male (6.8 × 7.7 mm) (MNHN-IU-2010-1500), Mozambique, Mozambique Channel, MAINBAZA, stn CC3174, 25°33’S, 33°13’E, 253–262 m., 17.04.2009.

Paratypes: MAINBAZA: 1 female (5.6 × 6.2 mm) (MNHN-IU-2008-10287) [photographed], Maputo transect, stn CP3133, 29°11’S 36°10’E, 200‒201 m, 10.04.2009 ; 1 male (4.2 × 4.7 mm) (MNHN-IU-2010-1501), Zambezi transect, stn CC3150, 19°31’S, 36°46’E, 261–264 m, 13.04.2009 ; 1 female (8.3 × 9.8 mm) (MNHN-IU-2008- 10286) [photographed], Zambezi transect, stn CC3151, 19°34’S, 36°45’E, 352–357 m, 13.04.2009 ; 1 female (9.4 × 11.0 mm) (MNHN-IU-2008-10288) [photographed], Mozambique Channel, stn CC3174, 25°33’S, 33°13’E, 253– 262 m, 17.04.2009 ; 1 male (5.7 × 6.9 mm) (MNHN-IU-2010-1574); MIRIKY: stn DW3238, 14°29’S, 47°27’E, 48–139 m, 06.07.2009; 2 females (6.1 × 7.2 mm, 8.2 × 9.6 mm) (MNHN-IU-2010-1033), off Nazeandry Bay , stn CP3289, 14°29’S, 47°26’E, 332–379 m, 14.07.2009 .

Other material examined. Madagascar. ATIMO VATAE: 1 male (MNHN-IU-2010-4367), stn DW3529, 24°24’S, 47°33’E, 402–407 m, 01.05.2010 ; 1 female (MNHN-IU-2010-4358), stn DW3582, 25°32’S, 44°16’E, 10.05.2010; 4 males, 7 females (ZRC 2015.210), 2 females (MNHN-IU-2010-4360), stn CP3583, 25°31’S, 44°16’E, 296–302 m, 10.05.2010; 2 males, 3 females (MNHN-IU-2010-4370c), stn CP3590, 25°03’S, 43°59’E, 300–309 m, 11.05.2010; 1 male, 3 females (MNHN-IU-2010-4363), stn CP3591, 25°03’S, 43°58’E, 400–402 m, 11.05.2010.

Diagnosis. Carapace ( Figs. 7 A, B; 100C, D) subtrapezoidal, 1.1‒1.2 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. 23 C) filling orbit, short, slightly mobile; cornea reduced, with reduced pigmentation. Posterior margin of epistome ( Fig. 23 C) with semicircular median lobe with deep median fissure, semicircular lateral margins. Third maxilliped ( Fig. 30 B) merus subquadrate, ischium slightly elongated, about same length as merus. Proportionally short ambulatory legs ( Fig. 7 A, B), P5 merus 0.6 cl. Chelipeds ( Figs. 7 A, B; 100C, D; 38G‒J) subequal in length, slightly dissimilar in females, heteromorphic in males. Major chela of males ( Fig. 38 G) with thick propodus, cutting margins with wide teeth. Minor chela of both sexes ( Fig. 38 H) with short teeth of about same size (one long, sharp tooth that overlaps dactylus when closed in largest paratype female). Inner margin of cheliped carpus with tooth in males, smooth in females. Fused thoracic sternites 1, 2 ( Fig. 51 B) triangular, proportionally narrow, short. Male pleon ( Figs. 51 B; 58B) with quadrate somite 6; proportionally short telson. G1 ( Fig. 67 G, H) stout, distal segment gently curved, distal segment curved inwards towards sternum, with short to long spinules. G2 ( Fig. 67 I) about 3/4 G1 length, straight, slender, distal segment short, straight. Female pleon ( Fig. 86 B) with lateral margins of somites strongly convex; telson proportionally short. Sterno-pleonal cavity of female ( Fig. 90 B) moderately deep, vulvae far apart from each other.

Colour. The carapace is yellowish-white to light brown or bright pink in life, the chelipeds and distal articles of the ambulatory legs white ( Fig. 100 C, D).

Etymology. The species is named after the continent of Africa to denote its western Indian Ocean distribution.

Remarks. Diagnostic for the new species are of sharp teeth (or only one in the largest two females) that overlap the dactylar finger of the minor chela when closed ( Fig. 38 H) as in most congeners, a median lobe of the epistome that is slightly shorter than in congeners ( Fig. 23 C), a more quadrate carapace than in C. rubida ( Fig. 7 A, B), relatively shorter ambulatory legs ( Fig. 7 A, B), and the merus of the third maxilliped is more subquadrate with the ischium slightly elongated ( Fig. 30 B).

Camatopsis africana is closest to C. rubida s. str. in the form of the G1, with both species found in the Indian Ocean. The distal part of the G 1 in large specimens of C. africana is nevertheless relatively less elongated, with relatively fewer long spinules ( Fig. 67 G, H versus Fig. 67 D, E). Camatopsis africana nevertheless can be easily separated from C. rubida by its proportionately shorter ambulatory legs ( Fig. 7 A, B versus Fig. 6 ), and the male pleonite 6 being proportionately narrower ( Fig. 51 B versus Fig. 51 A).

The photograph of a large, freshly collected female (9.4 × 11.0 mm, MNHN-IU-2008-10288) showed purplish spots on the pleon.

Distribution. Western Indian Ocean ( Mozambique, Madagascar). Depth: 48‒ 407 m.

Figures

FIGURE 6. Overall dorsal view of Camatopsis rubida. A, B, Andaman Sea (after Alcock 1899 a: pl. 74 fig. 3, 3 a); C ‒ E, Andaman Sea (after Alcock 1899 b: pl. 4 fig. 3, 3 b, 3 c); F, Andaman Sea: male 4.2 × 4.5 mm (ZMUC CRU 20539); G, Australia: female 9.0 × 10.7 mm (NMV J 54596); H, Australia: male 8.3 × 8.5 mm (NMV J 54591); I, Australia: female 6.0 × 7.0 mm (NMV J 61082); J, Australia: female 10.2 × 11.5 mm (QM W 17289); K, Indonesia: male 9.1 × 9.8 mm (NNM-ZMA 241605 c).

FIGURE 7. Overall dorsal view of species of Camatopsis. A, C. africana, Madagascar: holotype male 5.7 × 6.9 mm (MNHN- IU- 2010 - 1574); B, C. africana n. sp., Mozambique Channel: paratype female 9.4 × 11.0 mm (MNHN-IU- 2008 - 10288); C, C. thula n. sp., Taiwan: holotype male 8.9 × 9.3 mm (ZRC 1999.0662); D, C. thula n. sp., Taiwan: paratype female 7.1 × 7.6 mm (ZRC 2009.0348), E, C. thula n. sp., Taiwan: male 9.0 × 10.5 mm (ZRC 2009.347); F, C. thula n. sp., Taiwan: female 7.3 × 8.2 mm (ZRC 2009.348); G, C. valida n. sp., Fiji: holotype male 3.6 × 4.9 mm (MNHN-IU- 2013 - 9067); H, C. valida n. sp., Fiji: paratype female 3.5 × 4.3 mm (MNHN-IU- 2013 - 9467).

FIGURE 23. Frontal view of cephalothorax of species of Camatopsis and Chasmocarcinops. A, Camatopsis rubida, Andaman Sea: male 4.2 × 4.5 mm (ZMUC CRU 20539); B, Camatopsis rubida, Australia: male 8.3 × 8.5 mm (NMV J 54591); C, Camatopsis africana n. sp., Madagascar: holotype male 5.7 × 6.9 mm (MNHN-IU- 2010 - 1574); D, Camatopsis leptomerus n. sp., Philippines: holotype male 10.5 × 11.3 mm (NMCR); E, Camatopsis leptomerus n. sp., Philippines: paratype female 3.4 × 4.0 mm (ZRC 2015.159); F, Camatopsis minor n. sp., Indonesia: holotype male 3.6 × 4.3 mm (NNM-ZMA); G, Camatopsis thula n. sp., Taiwan: holotype male 8.9 × 9.3 mm (ZRC 1999.0662); H, Camatopsis valida n. sp., Fiji: holotype male 3.6 × 4.9 mm (MNHN-IU- 2013 - 9067); I, Chasmocarcinops gelasimoides, Andaman Sea: male 8.8 × 9.5 mm (PMBC 16849); J, Chasmocarcinops gelasimoides, Singapore: male 9.5 × 10.3 mm (ZRC 2000.1341).

FIGURE 30. Third maxilliped of species of Camatopsis and Chasmocarcinops. A, Camatopsis rubida, Australia: male 8.3 × 8.5 mm (NMV J 54591); B, Camatopsis africana n. sp., Madagascar: holotype male 5.7 × 6.9 mm (MNHN-IU- 2010 - 1574); C, Camatopsis leptomerus n. sp., Philippines: holotype male 10.5 × 11.3 mm (NMCR); D, Camatopsis thula n. sp., Taiwan: holotype male 8.9 × 9.3 mm (ZRC 1999.0662); E, Chasmocarcinops gelasimoides, Andaman Sea: male 8.8 × 9.5 mm (PMBC 16849); F, Chasmocarcinops gelasimoides, Singapore: male 9.5 × 10.3 mm (ZRC 2000.1341).

FIGURE 38. Chelae of species of Camatopsis. A, B, C. rubida, Australia: male 10.0 × 10.3 mm (NMV J 54592); C, D, C. rubida, Australia: male 10.0 × 10.3 mm (NMV J 54592); E, F, C. rubida, Indonesia: male 9.1 × 9.8 mm (NNM-ZMA 241605 c); G, H, C. africana n. sp., Madagascar: holotype male 5.7 × 6.9 mm (MNHN-IU- 2010 - 1574); I, J, C. africana n. sp., Madagascar: paratype male 8.3 × 9.8 mm (MNHN-IU- 2008 - 10286).

FIGURE 51. Anterior thoracic sternum and male pleon of species of Camatopsis and Chasmocarcinops. A, Camatopsis rubida, Australia: male 8.3 × 8.5 mm (NMV J 54591); B, Camatopsis africana n. sp., Madagascar: holotype male 5.7 × 6.9 mm (MNHN-IU- 2010 - 1574); C, Camatopsis leptomerus n. sp., Philippines: holotype male 10.5 × 11.3 mm (NMCR); D, Camatopsis thula n. sp., Taiwan: holotype male 8.9 × 9.3 mm (ZRC 1999.0662); E, Camatopsis valida n. sp., Fiji: holotype male 3.6 × 4.9 mm (MNHN-IU- 2013 - 9067); F, Chasmocarcinops gelasimoides, Singapore: male 9.5 × 10.3 mm (ZRC 2000.1341).

FIGURE 67. Gonopods of species of Camatopsis. A ‒ C, C. rubida, Andaman Sea: male 4.2 × 4.5 mm (ZMUC CRU 20539); D ‒ F, C. rubida, Australia: male 8.3 × 8.5 mm (NMV J 54591); G ‒ I, C. africana n. sp., Mozambique Channel: holotype male 6.8 × 7.7 mm (MNHN-IU- 2010 - 1500); J ‒ L, C. leptomerus n. sp., Philippines: holotype male 10.5 × 11.3 mm (NMCR); M ‒ O, C. thula n. sp., Taiwan: holotype male 8.9 × 9.3 mm (ZRC 1999.0662). A, B, D, E, G, H, J, K, M, N, ventral view of left G 1; F, dorsal view of left G 1; C, I, L, O, left G 2. Scales: A, C, D, G, I, J, L, M, O = 0.5 mm; B, E, F, H, K, N = 0.1 mm.

FIGURE 86. Female thoracic sternum and pleon of species of Camatopsis and Chasmocarcinops. A, Camatopsis rubida, Australia: female 6.0 × 7.0 mm (NMV J 61082); B, Camatopsis africana n. sp., Mozambique Channel: paratype female 9.4 × 11.0 mm (MNHN-IU- 2008 - 10288); C, Camatopsis leptomerus n. sp., Philippines: paratype female 12.7 × 13.2 mm (ZRC 2015.170); D, Camatopsis thula n. sp., Taiwan: paratype female 7.1 × 7.6 mm (ZRC 2009.0348); E, Camatopsis minor n. sp., Indonesia: paratype female 4.0 × 4.9 mm (NNM-ZMA); F, Chasmocarcinops gelasimoides, Singapore: female 9.3 × 10.6 mm (ZRC 2013.1411).

FIGURE 90. Vulvae of species of Camatopsis and Chasmocarcinops. A, Camatopsis rubida, Australia: female 6.0 × 7.0 mm (NMV J 61082); B, Camatopsis africana n. sp., Mozambique Channel: paratype female 9.4 × 11.0 mm (MNHN-IU- 2008 - 10288); C, Camatopsis leptomerus n. sp., Philippines: paratype female 12.7 × 13.2 mm (ZRC 2015.170); D, Camatopsis thula n. sp., Taiwan: paratype female 7.1 × 7.6 mm (ZRC 2009.0348); E, Camatopsis valida n. sp., Fiji: paratype female 3.5 × 4.3 mm (MNHN-IU- 2013 - 9467); F, Chasmocarcinops gelasimoides, Singapore: female 9.3 × 10.6 mm (ZRC 2013.1411).

FIGURE 100. Chasmocarcinus and Camatopsis. A, B, Chasmocarcinus longipes, Taboga, Panama: male (not examined) [A. Anker]; C, Camatopsis africana n. sp., Madagascar: paratype female 8.3 × 9.8 mm (MNHN-IU- 2008 - 10286) [T. - Y. Chan]; D, Camatopsis africana n. sp., Madagascar: paratype female 5.6 × 6.2 mm (MNHN-IU- 2008 - 10287) [T. - Y. Chan]; E, Camatopsis leptomerus n. sp., Philippines: male 5.2 × 4.5 mm (ZRC 2015.129) [P. K. L. Ng]; F, Camatopsis leptomerus n. sp., Vanuatu: female 7.2 × 7.9 mm (ZRC 2015.173) [J. C. Mendoza]; G, Camatopsis leptomerus n. sp., Vanuatu: female 9.5 × 10.1 mm (ZRC 2015.168) [T. - Y. Chan]; H, Camatopsis thula n. sp., Taiwan: paratype male 10.2 × 11.1 mm (ZRC 2001.2215) [T. - Y. Chan].