Nemausa cornuta ( Saussure, 1857 )

Carmona-Suárez, Carlos & Poupin, Joseph, 2016, Majoidea crabs from Guadeloupe Island, with a documented list of species for the Lesser Antilles (Crustacea, Decapoda, Brachyura, Majoidea), Zoosystema 38 (3), pp. 353-387 : 374-375

Nemausa cornuta ( Saussure, 1857)

( Fig. 8A, B )

Mithrax cornutus Saussure, 1857: 501 (Antilles) . — A. Milne-Edwards 1873-1880: 97 ( Martinique). — Wagner 1990: 6 (St Martin, Montserrat, Dominica, Martinique, Barbados, Grenadines, Tobago). — Paulmier 1993: 24 ( Martinique). — Poupin 1994: 41 ( Guadeloupe). — Gervain et al. 2002: 24 ( Guadeloupe).

Nemausa rostrata A. Milne-Edwards, 1875: 81 ( Martinique) ; 1880: 2 (St Croix, St John/Norman-Flanagan Passage, Montserrat, Grenadines).

Mithrax (Mithrax) cornutus – Rathbun 1925: 386 ( Dominica, Martinique).

Nemausa cornutus – Carré 2005: 23 ( Martinique). — Lira et al. 2013: table 1 (Margarita).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS 2012, 1♂ MNHN-IU-2013-4433 (lot JL1046-1, first identification as N. acuticornis ), st. GR 33, 9 m ; 2♂ MNHN-IU-2013-4959 (lot JL1402-3, first identification as N. acuticornis ), st. GB 30, 16 m;

1♂ juv. MNHN-IU-2013-14667 (lot JL150-2; first identification as N. acuticornis ), st. GM01, 1 m; 1 juv. MNHN-IU-2013-6787 (lot JL1453, first identification as Gen. sp.; N.? cornuta or juvenile of N. acuticornis ), st. GD 64, 60 m.

DIAGNOSIS. — Rostral horns longer that in N. acuticornis . Lateral spines of carapace long, bi or tri-fid. Carpus of cheliped spinous; row of spines above palm (see remarks).

HABITAT. — Found mainly on calcareous bottom, occasionally sand or mud. Collected 3-60 m, reported 1-1077 m.

DISTRIBUTION. — Western Atlantic. Bermuda, South Florida, Cuba, Jamaica, Haiti, Puerto Rico, Panamá, Colombia, Venezuela, Brazil. Lesser Antilles VI (St Croix, St John, Norman), ICA (St Martin, Montserrat, Guadeloupe, Dominica, Martinique, Grenadines, Barbados, Tobago), IOV (Margarita).

REMARKS

The type locality is Antilles, without precision (but perhaps Martinique) and the type in the Geneva Museum. KARUB- ENTHOS 2012 specimens assigned herein to Nemausa cornuta had been pre-identified as Nemausa acuticornis ( Stimpson, 1871) during the workshop in Besse-et-Saint- Anastaise. However, during the final writing of this work the examination of typical specimens of N. acuticornis from Martinique (rostral horns shorter, lateral spines of carapace shorter not bi or tri-fid, no spines on upper surface of palm; see Fig. 8C ) indicates that the specimens from KARUBENTHOS 2012 are probably N. cornuta instead. The distinction between N. acuticornis and N. cornuta is difficult as there is considerable morphological variation. Wagner (1990) considers that they are synonyms but this conclusion is not supported by Felder et al. (2009) and Windsor & Felder (2014). Because of these variations, the juvenile illustrated herein on figure 8B is attributed with hesitation to N.? cornuta as it could also be a juvenile of N. acuticornis with abnormal long rostral horns.

Omalacantha antillensis ( Rathbun, 1920) ( Fig. 8D )

Microphrys antillensis Rathbun, 1920: 24 (type locality: off Montego Bay Point, Jamaica).

Microphrys platysoma – Lira et al. 2013: table 1 (Los Roques; see remarks).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS 2012, 1♀ MNHN-IU-2013-4611 (lot JL1067-6), st. GB 20, 16 m ; 1 ♀ MNHN-IU-2013-4981 (lot JL1256-3), st. GB 24, 10 m; 2 ♂, 2 ♀ MNHN-IU-2013-4529 (lot JL1425-8), st. GB 32, 4 m; 1♀ MNHN- IU-2013-5073, st. GB 35, 2 m ; 1 ♂ MNHN-IU-2013-4420 (lot JL1499-7), st. GB 36, 16 m.

DIAGNOSIS. — Two processes on antero-lateral wall of carapace, the oblong branchial process not rimmed nor sharply defined. Three branchial spines about lateral angle. No lobe on margin of basal antennal segment behind antero-external spine. Four equally large, tubercles on intestinal region.

HABITAT. — On sand, rubble and shell bottoms, between algae. Collected 2-16 m, reported 1- 38 m.

DISTRIBUTION. — Western Atlantic. North Carolina, Bahamas, Cuba, Jamaica, Puerto Rico Gulf of Mexico, Colombia, Venezuela, Brazil. Lesser Antilles ICA (Guadeloupe), IOV (?Los Roques).

REMARKS

First report for Guadeloupe. The species is perhaps also in Lesser Antilles (IOV) from Lira et al. (2013) reported under M. platysoma ( Stimpson, 1860) . According to Rathbun (1925: 489) Microphrys platysoma is the eastern Pacific analogous of M. antillensis Rathbun, 1920 and its presence in the Atlantic is therefore doubtful. The genus Omalacantha Streets (1871) has been resurrected by Windsor & Felder (2014) for four species, including two in this contribution, O. antillensis and O. bicornuta .

Omalacantha bicornuta ( Latreille, 1825) ( Fig. 8E )

Pisa bicornuta Latreille, 1825 ( 1825 -1828): 141 (type locality: ‘Nouvelle Hollande’, erroneous; probably ‘Antilles’ instead).

Pericera bicorna – H. Milne Edwards 1834 -1840: 337 (Antilles).

Pericera bicornis Saussure, 1857: 501 (Antilles) .

Pisa galibica Desbonne , in Desbonne & Schramm, 1867: 18 ( Guadeloupe).

Pisa purpurea Desbonne , in Desbonne & Schramm, 1867: 18 ( Guadeloupe).

Microphyrus bicornutus – A. Milne-Edwards 1873-1880: 61 (Antilles; synonymy). — Rathbun 1924b:21 ( Curaçao); 1925: 489 ( St Thomas, St Eustatius, Barbados, Trinidad, Curaçao). — Rodríguez 1980: 293 (Los Roques, Margarita, Cubagua). — Scelzo & Varela 1988: 37 (Blanquilla). — García et al. 1998: table 1 (Isla de Aves ). — Hernández et al 1999: table 2 (Margarita). — Marcano & Bolaños 2001: 80 (Cubagua). — Lira 2004: table 1 ( Tortuga). — Tagliafico et al. 2005: table 1 (Los Frailes near Margarita). — Hernández-Ávila et al. 2007: table 1, (Cubagua). — Lira et al. 2013: table 1 (Isla de Aves, Margarita, Cubagua, Los Roques , Tortuga, Islote Lobos-Los Frailes/Margarita, Blanquilla).

MATERIAL EXAMINED. — Guadeloupe. KARUBENTHOS 2012, 1 ♂ MNHN-IU-2013-4178, st. GB01, 6 m ; 4 ♂, 6 ♀ MNHN- IU-2013-5913 (lot JL563), st. GB09, 6 m ; 1♂ MNHN-IU-2013-4765 (lot JL1072-3), st. GB 21, 8 m; 2 ♂, 1 ♀ MNHN-IU-2013-4538 (lot JL1364-2), st. GB 29, 2 m; 2 ♀ MNHN-IU-2013-4445 (lot JL1425-4), 1♀ MNHN-IU-2013-4458 (lot JL1425-7), st. GB 32, 4 m; 3♂ MNHN-IU-2013-6798 (lot JL1128-2), st. GD 41, 2 m; 1♀ ov., 2 ♀ juv. MNHN-IU-2013-5964 (lot JL40-1), st. GM01, 1 m; 1♂, 3 ♀ ov. MNHN-IU-2013-5961 (lot JL36-1), st. GM02, 1 m; 1♀ MNHN-IU-2013-4259 (lot JL252-1), st. GM06, 1 m; 1 ♂ MNHN-IU-2013-5946 (lot JL355-1), st. GM07, 1 m; 1 ♂, 1 ♀ MNHN-IU-2013-6788 (lot JL396-1), st. GM08, 1 m; 3 ♂, 1 ♀ MNHN-IU-2013-4960 (lot JL470-1), 1 sp. MNHN-IU-2013-4217 (lot JL489-1), st. GM09, 1 m; 4 ♂ MNHN-IU-2013-6609 (lot JL548- 1), 1 ♂ MNHN-IU-2013-6622 (lot JL548-2), 1 ♂, 2 ♀ MNHN- IU-2013-6616 (lot JL560-1), 1 sp. MNHN-IU-2013-6620 (lot JL570), st. GM 10, 1 m ; 1♂ MNHN-IU-2013-6614 (lot JL688-1), st. GM 11, 1 m; 1 ♂ MNHN-IU-2013-5943 (lot JL675), st. GM 14, 1 m; 9 ♂, 3 ♀ MNHN-IU-2013-6606 (lot JL784), st. GM 17, 1 m; 1 ♂ MNHN-IU-2013-4818 (lot JL1322), st. GM 31, 2 m; 2♂, 6 ♀ MNHN-IU-2013-4269 (lot JL1419-1), st. GM 34, 1 m; 1♀ MNHN-IU-2013-4957 (lot JL1434-2), st. GR 49, 15 m; 1 ♂ MNHN-IU-2013-4534 (lot JL1400-4), st. GR 50, 4 m; 1 ♀ MNHN- IU-2013-6756 (lot JL1282), st. GS 30, 2 m.

DIAGNOSIS. — Carapace tuberculate. A marginal spine at branchial angle. A tubercle on margin of basal antennal segment behind antero-external spine. Claws spotted.

HABITAT. — On rocky shores, Thalassia , Rhizophora mangle roots and corals. Collected 1-15 m, reported 1- 70 m.

DISTRIBUTION. — Western Atlantic. Bermuda, North Carolina , Florida , Gulf of Mexico , Panamá, Colombia, Venezuela, Brazil. Lesser AntillesVI (St Thomas), ICA ( St Martin *, St Eustatius , Guadeloupe , Martinique , Isla de Aves, Barbados,Trinidad), IOV ( Los Frailes , Margarita , Cubagua , Blanquilla , Tortuga, Los Roques, Curaçao). * St Martin from unpublished fieldwork ( UF31864 , 9.IV.2012; UF32014-32017, 16.IV.2012; UF32363-32373, 20.IV.2012, coll. & photos A. Anker / G. Paulay) .

REMARK

A. Milne-Edwards (1873-1880) indicates that the species is very common in Lesser Antilles and give full synonymy for older references in the region. On the field the spotted claw is a good mean to recognize quickly this species.

Figures

FIG. 8. — Mithracidae (Windsor & Felder, 2014): A, Nemausa cornuta (Saussure, 1857), 1♂ MNHN-IU-2013-4433, st. GR33, 9 m; B, Nemausa?cornuta, 1 juv. MNHN-IU-2013-6787, st. GD64, 60 m; C, Nemausa acuticornis (Stimpson, 1871), Martinique, 1♂ coll. R. Ferry, n°52 BIOSPHERES Fort de France, XI.2015; D, Omalacantha antillensis (Rathbun, 1920), 1♂ MNHN-IU-2013-4420 (lot JL1499-7), st. GB36, 16 m; E, Omalacantha bicornuta (Latreille, 1825), 1 ♂ MNHN- IU-2013-6622, st. GM10, 1 m; F, Pitho aculeata (Gibbes, 1850), 1 ♀ MNHN-IU-2013-6731, st. GB29, 2 m; G, Pitho?laevigata (or P. lherminieri [Desbonne, in Desbonne & Schramm,1867]),1 ♂ MNHN-IU-2013-4760, st.GM06,1 m;H, Pitho lherminieri, 1♂ MNHN-IU-2013-4536, st.GR50,4 m; I, Pitho mirabilis (Herbst,1794), 1 ♀ juv.MNHN-IU-2013-5949, st. GB36,16 m; J, Teleophrys ruber (Stimpson, 1871), 1 ♂ no MNHN (lot JL125), st. GR03, 6 m; K, Thoe puella Stimpson,1860,1 ♂ MNHN-IU-2013-4256 (lot JL489-5), st. GM09, 1 m. Majidae Samouelle, 1819: L, Temnonotus granulosus A. Milne-Edwards, 1875, 1 ♀ MNHN-IU-2013-4422, no station number,coll. D. Lamy,trap 300 m; M, Thersandrus compressus (Desbonne,in Desbonne & Schramm,1867), 1♀ juv.MNHN-IU-2013-5915, st.GR14,27 m.