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Type: Article
Published: 2020-07-13
Page range: 531–545
Abstract views: 57
PDF downloaded: 39

A new crab of the genus Nanoplax from the Gulf of Mexico, and assignment of Micropanope pusilla to a new genus (Crustacea, Brachyura, Pseudorhombilidae)

Department of Biology and Laboratory for Crustacean Research, University of Louisiana at Lafayette, P.O. Box 42451, Lafayette, Louisiana 70504–2451, USA.
Crustacea Pseudorhombilidae Gulf of Mexico Nanoplax new species generic revision


Nanoplax thomai n. sp. is described from the Gulf of Mexico, representing the second species of the genus. The description is based upon a number of specimens previously misidentified as Micropanope truncatifrons Rathbun, 1898, including one so represented in recent molecular phylogenetic analyses. As restricted, Micropanope truncatifrons remains known with certainty from only the limited type series, which does not include a mature male, and sequence quality tissues are not available for molecular phylogenetic analyses. Its generic placement remains questionable following morphological study of its type materials and comparisons to specimens representing other present and former members of Micropanope Stimpson, 1871. Those comparisons underscore that morphological and molecular distinctions warrant assignment of Micropanope pusilla A. Milne-Edwards, 1880 to a new genus, herein designated as Pseudopanopeus n. gen.



  1. Abele, L.G. & Kim, W. (1986) An illustrated guide to the marine decapod crustaceans of Florida. State of Florida, Department of Environmental Regulation, Technical Series, Vol. 8, No. 1, parts 1 & 2, 1–760.

    Felder, D.L., Álvarez, F., Goy, J.W. & Lemaitre, R. (2009) Chapter 59: Decapoda (Crustacea) of the Gulf of Mexico, with comments on the Amphionidacea. In: D.L. Felder & D.K. Camp (eds), Gulf of Mexico Origin, Waters, and Biota. Volume 1, Biodiversity. Texas A&M University Press, College Station. pp. 1019–1104.

    Garth, J.S. (1978) Marine biological investigations in the Bahamas. 19. Decapoda Brachyura. Sarsia, 63, 317–333.

    Guinot, D. (1967) Recherches préliminaries sur les groupements naturels chez les crustacés décapods brachyoures. II. Les anciens genres Micropanope Stimpson et Medaeus Dana. Bulletin du Muséum National d’Histoire Naturelle, Paris, Série 2, 39, 345–374.

    Guinot, D. (1971) Recherches préliminaries sur les groupements naturels chez les crustacés décapods brachyoures. VIII. Syntheses et Bibliographie. Bulletin du Muséum National d’Histoire Naturelle, Paris, Série 2, 42, 1063–1090.

    Hendrickx, M.E. (1995) Restitution de Pseudorhombila xanthiformis Garth, 1940, pour Nanoplax garthi Guinot, 1969 (Decapoda, Goneplacidae). Crustaceana, 68 (1), 12–20.

    Hendrickx, M.E. (1998) A new genus and species of “goneplacid-like brachyuran crab (Crustacea: Decapoda) from the Gulf of California, Mexico, and a proposal for use of the family Pseudorhombilidae Alcock, 1900. Proceedings of the Biological Society of Washington, 111 (3), 634–644.

    Lemaitre, R. (1984) Decapod crustaceans from Cay Sal Bank, Bahamas, with notes on their zoogeographic affinities. Journal of Crustacean Biology, 4, 425–447.

    Martin, J.W. & Abele, L.G. (1986) Notes on male pleopod morphology in the brachyuran crab family Panopeidae Ortmann, 1893, sensu Guinot (1978) (Decapoda). Crustaceana, 50, 182–198.

    Melo, G.A.S. de (1996) Manual de Identificação dos Brachyura (Cananguejos e Siris) do Litoral Brasileiro. Plêiade/FAPESP, São Paulo, 295 pp.

    Milne-Edwards, A. (1873–1881) Études sur les Xiphosures et les Crustacés de la Région Mexicaine, Mission Scientifique au Mexique et dans l’Amerique centrale. Recherches Zoologiques a l’Histoire de la Faune de l’Amerique Centrale et du Mexique, Paris, Part 5, 1–368, 61 pls.

    Milne-Edwards, A. & Bouvier, E.L. (1923) Reports on the results of dredging under the supervision of Alexander Agassiz in the Gulf of Mexico (1877–78) in the Caribbean Sea (1878–79), and along the Atlantic coast of the United States (1880), by the U.S. Coast Survey steamer “Blake., Lieut.-Com. C.D. Sigsbee, U.S.N., and Commander J.R. Bartlett, U.S.N., commanding. XLVII. Les Porcellanides et des Brachyures. Memoirs of the Museum of Comparative Zoölogy at Harvard College, 47, 283–395, 12 pls.

    Ng, P.K.L, Guinot, D. & Davie, P.J.F. (2008) Systema brachyurorum. Part I. An annotated checklist of extant brachyuran crabs of the world. The Raffles Bulletin of Zoology, 17, 1–286.

    Poupin, J. (2018) Les Crustacés décapodes de Petites Antilles. Avec de nouvelles observations pour Saint-Martin, la Guadeloupe et las Martinique. Publications Scientifiques du Muséum national d’Histoire naturelle (Patrimoines naturels 77), Paris, 264 pp.

    Powers, L.W. (1977) A catalogue and bibliography to the crabs (Brachyura) of the Gulf of Mexico. Contributions in Marine Science, 20(supplement), 1–190.

    Rathbun, M.J. (1898) The Brachyura of the biological expedition to the Florida Keys and the Bahamas in 1893. Bulletin from the Laboratories of Natural History of the State University of Iowa, 4, 250–294, 9 pls.

    Rathbun, M.J. (1899) Jamaica Crustacea. Journal of the Institute of Jamaica, 2 (6), 628–629.

    Rathbun, M.J. (1901) The Brachyura and Macrura of Porto Rico. Bulletin of the United States Fish Commission for 1900, 20 (2), 1–127, 129–137, 2 colored pls.

    Rathbun, M.J. (1930) The cancroid crabs of America of the families Euryalidae, Portunidae, Atelecyclidae, Cancridae and Xanthidae. Bulletin of the U.S. National Museum, 152, i–xvi + 1–609.

    Rathbun, M.J. (1933) Brachyuran crabs of Porto Rico and the Virgin Islands. In Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences, 15 (1), 1–121.

    Smith, S.I. (1870) Notes on American Crustacea, No. 1, Ocypodoidea. Transactions of the Connecticut Academy of Arts and Sciences, 2(1), 113–176, pls 2–5.

    Soto, L.A. (1986) Deep-water brachyuran crabs of the Straits of Florida (Crustacea, Decapoda). Anales del Instituto Ciencias del Mar y Limnologia, Universidad Nacional Autónoma de México, 13, 1–68.

    Thoma, B.P. & Felder, D.L. (2012) Redescription of Hexapanopeus lobipes (A. Milne-Edwards, 1880), with reassignment to Milnepanopeus n. gen. (Crustacea: Decapoda: Panopeidae). Journal of Crustacean Biology, 32 (1), 141–152.

    Thoma, B.P. & Felder, D.L. (2020) A new genus and species of xanthoid crab (Decapoda: Brachyura) from offshore hard bank habitats in the Gulf of Mexico. Zootaxa, 4731 (3), 403–413.

    Wass, M.L. (1955) The decapod crustaceans of Alligator Harbor and adjacent inshore areas of northwestern Florida. The Quarterly Journal of the Florida Academy of Sciences, 18, 129–176.

    Williams, A.B. (1965) Marine decapod crustaceans of the Carolinas. Fishery Bulletin, U.S., 65, i–xi + 1–298.

    Williams, A.B. (1978) Transfer to Pseudomedaeus of the xanthid crab Micropanope distinctus (Rathbun). Proceedings of the Biological Society of Washington, 91, 546–557.