Decapoda - Brachyura - Mithracidae - Nemausa

Nemausa cornuta (de Saussure, 1857)

World Distribution
Poupin (1994, Etudes & Thèses) - Western Atlantic. Bermudas, Bahamas, Florida, Gulf Mexico, Carribean Sea (Panama, Colombia), Cuba, Jamaica, Haiti, Puerto Rico, Lesser Antilles (Montserrat, Guadeloupe, Dominica, Martinique, Grenadines, Barbados), Brazil (off Bahia). 20-458 m, 170-250 m around Guadeloupe.
Felder et al. (2009) - <1-1077 m. Ber, S Fla, Cuba, S Antil, Brazil

Environnement : Marine - Substrat/Association : Hard bottom (rock and rubbles)

Vertical range : Shallow to deep-waters (e.g. 10-190 m) - Min-Max observed: 1-1077 m

Lesser Antilles data
Distribution: WA. Bermudas, southern Florida, Cuba, Brazil. Lesser Antilles, VGI (St Croix, St John, Norman), ICA (St Martin, Montserrat, Guadeloupe, Dominica, Martinique, St Vincent, Barbados, Tobago), IOV (Margarita). <1-1077 m.
Mithrax cornutus Saussure, 1857: 501, 'Antilles'. - A. Milne-Edwards, 1873-1880: 97, pl. 22, Martinique [Le Muséum possède deux exemplaires de cette espèce, recueillis à la Martinique par M. Bellenger, en 1859]. - Wagner, 1990: 6, fig. 1-4, Dominica, Martinique, Tobago; also from literature Barbados, Montserrat, St Martin/Maarten, St Vincent (Grenadines). - Paulmier, 1993: 24, Martinique [R/V Polka, trap, 400 m]. - Poupin, 1994: 41, Guadeloupe [R/V Polka, 170-450 m, det. M. Tavares (MNHN)]. - Gervain et al., 2002: 24, Guadeloupe [R/V Polka, trap 215-235 m].
Nemausa rostrata A. Milne-Edwards, 1875: 81, pl. 17, fig. 4, Martinique [le Muséum de Paris possède un exemplaire provenant de la Martinique]. - A. Milne-Edwards, 1880a: 2, St Croix, St John, Norman (Flanagan Passage), Montserrat, Grenadines [R/V Blake, 27-163 brasses] - Accepted as Nemausa cornuta (Saussure, 1857) in WoRMS (2016).
Mithrax (Mithrax) cornutus - Rathbun, 1925: 386, pl. 137, fig. 3-4, pl. 256, Dominica, Martinique.
Nemausa cornutus - Carré, 2005: 23, Martinique. - Lira et al., 2013: Tab. 1, Margarita.
Nemausa cornuta - Carmona-Suárez & Poupin, 2016: 374, Guadeloupe, Karubenthos 2012, 1 male MNHN-IU-2013-4433 (lot JL1046-1, first identification as N. acuticornis), st. GR33, 9 m; 2 males MNHN-IU-2013-4959 (lot JL1402-3, first identification as N. acuticornis), st. GB30, 16 m; 1 male 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. GD64, 60 m. - Poupin & Corbari, 2016: in press, Guadeloupe, Karubenthos II 2015, st. DW4590, 21 June 2015, 15°57.32'N, 61°28'W, 135-83 m, MNHN-IU-2013-18997; st. DW4545, 14 June 2015, 16°30.17'N, 61°31.41'W, 82-60 m, MNHN-IU-2013-18944 [Check number, no visible on photo].
Nemausa cornuta - Martinique, groupe BIOSPHERES, novembre 2015, coll. R. Ferry & coll.
Comment: This species have great morphological variations, especially for length of the rostrum (Wagner, 1990). Its depth range around Guadeloupe is 60-450 m. It is related to N. acuticornis (see under that species).

Nemausa cornuta — Parasram et al., 2023 (Zootaxa): 26, Barbados

French Guiana and surroundings areas: Guiana, Suriname, Brazil (Amapà)
Nemausa cornuta – Barreto et al., 1993: tab. 1, Brazil Amapá. — Melo, 1996: 242, Brazil Amapá. — Melo, 1998: 466, Brazil Amapá. — Silva et al., 2002: 102, tab. 3, ?Brazil Amapá [Programa Revizee/Norte]. — Coelho et al., 2008: 23, Brazil Amapá [from Gomes Corrêa & Silva Brum (1980)]. — Alves et al., 2012, tab. 1, Brazil Amapá.
Distribution/Habitat – WA; Marine; 1–1077 m.

Comment(s) on data
According to modern synonymy, it seems that the Nemausa rostrata A. Milne-Edwards, 1881 is a juvenile and synonym of Mithrax cornuta. It is amazing that this single species has been reported under two separate genera by A. Milne-Edwards (1881) but this is still plausible if great morphological variation with size/sex in the Majidae is considered.
Wagner (1990) list Mithrax acuticornis Stimpson as a junior synonym of N. cornuta (Saussure), a decision not followed by Felder et al. (2009, note n°308 - While we adopt many of the synonymies suggested by Wagner (1990), we defer on treatment of Nemausa acuticornis as a junior synonym of N. cornutus, pending more thorough comparative study).

References : PDF list, 214 pp (1.4 Mo)

This species in Worms Database