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A new dromiid crab (Crustacea, Brachyura, Dromioidea) from the Upper Eocene of Huesca (Aragón, northern Spain)



A new genus and species of brachyuran crab from the Upper Eocene (Priabonian) strata in Basa Valley (Huesca, northern Spain) assignable to the superfamily Dromioidea, Basadromia longifrons n. gen., n. sp., adds to current knowledge of the morphological diversity and geographical-stratigraphical distribution of the superfamily. The main characters of the new form, such as the orbitofrontal construction with two median teeth and an rostral tooth situated in a lower plane, two minor frontal (inner orbital) teeth, well-marked cervical and branchial grooves, general carapace outline, and the shape and distribution of dorsal regions, confirm placement in Dromioidea. Unique features, such as the four conspicuous frontal teeth, lateral margins of carapace with small, subtle spines, the reduced length of the posterior margin, disposition of dorsal grooves, and peculiar shape and distribution of the dorsal regions (mainly protogastric and epibranchial), warrants the erection of a new genus and new species. In the absence of ventral features the new taxon is tentatively assigned to the family Dromiidae after detailed comparison with both fossil and extant members.



Crustacea, Decapoda, Dromiidae, Basadromia longifrons, new taxon

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Artal, P., Van Bakel, B.W.M., Fraaije, R.H.B. & Jagt, J.W.M. (2013) New retroplumid crabs (Crustacea, Brachyura, Retroplumidae Gill, 1894) from the Eocene of Huesca (Aragón, Spain). Zootaxa, 3652 (3), 343–352.

Barnolas, A. (1973) Dromilites vicensis n. sp. nuevo braquiuro del Eoceno marino de Cataluña. Instituto de Investigaciones Geológicas, 28, 5–13.

Beschin, C., Busulini, A., De Angeli, A. & Tessier, G. (2007) I decapodi dell’Eocene inferiore di Contrada Gecchelina (Vicenza, Italia settentrionale) (Anomura e Brachyura). Museo di Archeologia e Scienze Naturale “G. Zanna-to”, Montecchio Maggiore, Vicenza, 76 pp.

Beschin, C., De Angeli, A., Checchi, A. & Zarantonello, G. (2012) Crostacei del giacimento eocenico di Grola presso Spagnago di Cornedo Vicentino (Vicenza, Italia settentrionale) (Decapo-da, Stomatopoda, Isopoda). Museo di Archeologia e Scienze Naturale “G. Zanna-to”, Montecchio Maggiore, Vicenza, 100 pp.

Canudo, J.I. & Molina, E. (1988) Biocronología con foraminíferos planctónicos de la secuencia deposicional de Jaca (Pirineo aragonés): Eoceno medio y superior. Actas II Congreso Geológico de España, 273–276.

Canudo, J.I., Malagón, J., Meléndez, A., Millán, H., Molina, E. & Navarro, J.J. (1991) Las secuencias deposicionales del Eoceno medio y superior de las Sierras exteriores (Prepirineo meridional aragonés). Geogaceta, 9, 81–84.

Collins, J.S.H. (2002) A taxonomic review of British decapod Crustacea. Bulletin of the Mizunami Fossil Museum, 29, 81–92.

Collins, J.S.H. & Jakobsen, S.L. (2004) New crabs (Crustacea, Decapoda) from the Eocene (Ypresian/Lutetian) Lillebælt Clay Formation of Jutland, Denmark. Bulletin of the Mizunami Fossil Museum, 30 (2003), 63–96.

Förster, R. & Mundlos, R. (1982) Krebse aus dem Alttertiär von Helmstedt and Handorf (Niedersachsen). Palaeontographica, A179, 148–184.

Guinot, D. & Tavares, M. (2003) A new subfamilial arrangement for the Dromiidae de Haan, 1833, with diagnoses and descriptions of new genera and species (Crustacea, Decapoda, Brachyura). Zoosystema, 25 (1), 43–129.

Guinot, D., Tavares, M. & Castro, P. (2013) Significance of sexual openings and supplementary structures on the phylogeny of brachyuran crabs (Crustacea, Decapoda, Brachyura), with new nomina for higher-ranked podotreme taxa. Zootaxa, 3665 (1), 1–414.

Karasawa, H., Schweitzer, C.E. & Feldmann, R.M. (2011) Phylogenetic analysis and revised classification of podotrematous brachyurans (Decapoda) including extinct and extant families. Journal of Crustacean Biology, 31 (3), 523–565.

McLay, C.L. (1993) Crustacea Decapoda: The sponge crabs (Dromiidae) of New Caledonia and the Philippines with a review of the genera. In: Crosnier, A. (Ed.), Résultats des Campagnes MUSORSTOM. Vol. 10. Mémoires du Muséum national d’Histoire naturelle, 156, 111–251. [Paris]

McLay, C.L. (2001a) The Dromiidae of French Polynesia and a new collection of crabs (Crustacea, Decapoda, Brachyura) from the Marquesas Islands. Zoosystema, 23 (1), 77–100.

McLay, C.L. (2001b) Dynomenidae and Dromiidae (Decapoda, Brachyura) from Guam, Philippine Islands, Tonga and Samoa. Zoosystema, 23 (4), 807–856.

McLay, C.L. & Ng, P.K.L. (2007) Revision of the Indo-West Pacific sponge crabs of the genus Petalomera Stimpson, 1858 (Decapoda: Brachyura: Dromiidae). The Raffles Bulletin of Zoology, 55 (1), 119–132.

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.

Ossó, À., Domínguez, J.L. & Artal, P. (2014) Pyreneplax basaensis new genus, new species (Decapoda, Brachyura, Vultocinidae) from the Priabonian (Late Eocene) of the Pyrenees of Huesca (Aragón, Spain), and remarks on the genus Lobonotus A. Milne-Edwards, 1863. Treballs Museu Geologia Barcelona, 20, 33–43.

Puigdefábregas, C. (1975) La sedimentación molásica en la Cuenca de Jaca. Monografías del Instituto de Estudios Pirenaicos. Número extraordinario de la revista Pirineos, 104, 1–188.

Quayle, W.J. & Collins, J.S.H. (1981) New Eocene crabs from the Hampshire Basin. Palaeontology, 24, 733–758.

Schweitzer, C.E., Feldmann, R.M., Garassino, A., Karasawa, H. & Schweigert, G. (2010) Systematic list of fossil decapod crustacean species. Crustaceana Monographs, 10, 1–222.

Schweitzer, C.E. & Feldmann, R.M. (2010) Sphaerodromiidae (Brachyura: Dromiacea: Dromioidea) in the fossil record. Journal of Crustacean Biology, 30 (3), 417–429.

Schweitzer, C.E., Feldmann, R.M. & Karasawa, H. (2012) Part R, Revised, Volume 1, Chapter 8M: Systematic decriptions: Infraorder Brachyura, Section Dromiacea. Treatise Online, 51, 1–43.

Van Bakel, B.W.M., Artal, P., Fraaije, R.H.B. & Jagt, J.W.M. (2009) A new Early Oligocene crab (Decapoda, Brachyura, Dromiacea) from northwest Belgium, with comments on its palaeobiology. Geologica Belgica, 12, 45–57.

Via, L. (1959) Decápodos fósiles del Eoceno español. Boletín del Instituto Geológico y Minero de España, 70, 331–402.

Via, L. (1969) Crustáceos decápodos del Eoceno español. Pirineos, 91–94, 1–469.



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