Abstract
A new species, Paranaxia keesingi sp. nov., is described based on specimens collected in northern Australia. The new species differs from its only congener, P. serpulifera (Guérin, 1832, in Guérin-Méneville 1829–1837), by several characters including carapace setation, sternal cavities, absence of a subhepatic spine, presence of a sharp spine on the posterodistal angle of the cheliped merus, relatively shorter chelipeds, and longer and more slender ambulatory legs. Morphological separation of the two species is supported by 12s rDNA sequence divergences of 7.4–8.2%. Like P. serpulifera, the newly described species exhibits direct development with females carrying juvenile individuals under the pleon. Both species are sympatric, but Paranaxia keesingi sp. nov. is found in deeper waters than P. serpulifera.
References
Balss, H. (1935) Brachyura of the Hamburg Museum expedition to south-western Australia, 1905. Journal of the Royal Society of Western Australia, 21, 113–151.
Davie, P.J.F., Guinot, D. & Ng, P.K.L. (2015) Anatomy and Functional morphology of Brachyura. In: Castro, P., Davie, P.J.F., Guinot, D., Schram, F.R. & Von Vaupel Klein, J.C. (Eds.), Treatise on Zoology – Anatomy, Taxonomy, Biology. The Crustacea. Brill, Leiden and Boston, pp. 11–163.
http://dx.doi.org/10.1163/9789004190832_004Griffin, D.J.G. (1966) A review of the Australian majid spider crabs (Crustacea, Brachyura). Australian Zoologist, 13, 259–298.
Griffin, D.J.G. & Tranter, H.A. (1986) The Decapoda Brachyura of the Siboga expedition. Part VIII: Majidae. Siboga Expéditie, 39, 1–335.
Guérin-Méneville, F.E. (1829–1837) Crustacés. In: Cuvier, G. (Ed.), Iconographie du Règne animal de G. Cuvier, ou représentation d’après nature de l’une des espèces les plus remarquables et souvent non encore figurées de chaque genre d’animaux Avec une text descriptif mis au courant de la science. Ouvrage pouvant servir d’atlas à tous les traités de zoologie. J.B. Baillière, Paris and London, pp. 9–35.
Haswell, W.A. (1882) Catalogue of the Australian stalk- and sessile-eyed Crustacea. Australian Museum, Sydney, 324 pp.
http://dx.doi.org/10.5962/bhl.title.1948Holthuis, L.B. & Manning, R.B. (1990) Crabs of the subfamily Dorippinae MacLeay, 1838, from the Indo-West Pacific region (Crustacea: Decapoda: Dorippidae). Researches on Crustacea, 3, 1–151.
Jones, D.S. (1990) Annotated checklist of marine decapod Crustacea from Shark Bay, Western Australia. In: Berry, P.B., Bradshaw, S.D. & Wilson, B.R. (Eds.), Research in Shark Bay: Report of the France-Australe Bicentenary Expedition Committee. Western Australian Museum, Perth, pp. 169–208.
Kearse, M., Moir, R., Wilson, A., Stones-Havas, S., Cheung, M., Sturrock, S., Buxton, S., Cooper, A., Markowitz, S., Duran, C., Thierer, T., Ashton, B., Mentjies, P. & Drummond, A. (2012) Geneious Basic: an integrated and extendable desktop software platform for the organization and analysis of sequence data. Bioinformatics, 28 (12), 1647–1649.
http://dx.doi.org/10.1093/bioinformatics/bts199Low, M.E., Ng, P.K. & Evenhuis, N.L. (2013) Names and publication dates of the Brachyura in FÉ Guérin (Guérin-Méneville)(Crustacea: Decapoda). Zootaxa, 3736 (2), 101–127.
http://dx.doi.org/10.11646/zootaxa.3736.2.1Miers, E.J. (1876) Descriptions of some new species of Crustacea, chiefly from New Zealand. The Annals and Magazine of Natural History, Series 4, 17, 218–229.
http://dx.doi.org/10.1080/00222937608681934Miers, E.J. (1879) On the classification of the Maioid Crustacea or Oxyrhyncha, with a synopsis of the families, sub-families and genera. Journal of the Linnean Society of London. Zoology, 14, 634–673.
Miers, E.J. (1884) Crustacea. Report of the Zoological Collections made in the Indo–Pacific Ocean during the voyage of HMS ‘Alert’, 1881–1882 : 178–331, Part 2, 513–575.
Milne Edwards, H. (1834) Histoire naturelle des Crustacés, comprenant l’anatomie, la physiologie et la classification de ces animaux. Vol. 1. Librairie Encyclopédique de Roret, Paris, 468 pp.
Mokady, O., Rozenblatt, S., Graur, D. & Loya, Y. (1994) Coral-host specificity of Red Sea Lithophaga bivalves: interspecific and intraspecific variation in 12S mitochondrial ribosomal RNA. Molecular Marine Biology and Biotechnology, 3, 158–164.
Montgomery, S.K. (1931) Report on the Crustacea Brachyura of the Percy Sladen Trust Expedition to the Abrolhos Islands under the leadership of Professor W.J . DAKIN, D.SC., F.L.S., in 1913; along with other crabs from Western Australia. Linnean Society's Journal, 37, 405–465.
http://dx.doi.org/10.1111/j.1096-3642.1931.tb00470.xMorgan, G.J. (1987) Brooding of juveniles and observations on dispersal of young in the spider crab Paranaxia serpulifera (Guérin)(Decapoda, Brachyura, Majidae) from Western Australia. Records of the Western Australian Museum, 13, 337–343.
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.
Poore, G.C.B. (2004) Marine decapod Crustacea of southern Australia: a guide to identification. CSIRO Publishing, Melbourne, 574 pp.
Rahayu, D.L. & Ng, P.K.L. (2000) Some new and interesting records of spider crabs (Decapoda, Brachyura, Majidae) from Indonesia. Crustaceana, 73, 887–890.
http://dx.doi.org/10.1163/156854000504886Rathbun, M.J. (1897) A revision of the nomenclature of the Brachyura. Proceedings of the Biological Society of Washington, 11, 153–167.
Rathbun, M.J. (1914) Stalk-eyed Crustaceans collected at the Monte Bello Islands. Proceedings of the Zoological Society of London, 84 (3), 653–664.
http://dx.doi.org/10.1111/j.1469-7998.1914.tb07055.xRathbun, M.J. (1924) Results of Dr. E. Mjöberg’s Swedish scientific expeditions to Australia 1910–1913 37. Brachyura, Albuneidae and Porcellanidae. Arkiv för Zoologi, 16, 1–33.
Sakai, T. (1976) Crabs of Japan and the adjacent seas. Kodansha Ltd, Tokyo, 773 pp.
Spamer, E.E. & Bogan, A.E. (1992) General Invertebrates Collection of the Academy of Natural Sciences of Philadelphia. Tryonia, 26, 1–305.
Spamer, E.E. & Bogan, A.E. (1994) Type specimens of Crustacea surviving in the Guérin Collection, Academy of Natural Sciences of Philadelphia. Proceedings of the Academy of Natural Sciences of Philadelphia, 145, 35–46.
Tamura, K., Stecher, G., Peterson, D., Filipski, A. & Kumar, S. (2013) MEGA6: Molecular Evolutionary Genetics Analysis version 6.0. Molecular Biology and Evolution, 30, 2725–2729.
http://dx.doi.org/10.1093/molbev/mst197Tavaré, S. (1986) Some probabilistic and statistical problems in the analysis of DNA sequences. Lectures on Mathematics in the Life Sciences, 17, 57–86.
Teske, P.R., McLay, C.L., Sandoval-Castillo, J., Papadopoulos, I., Newman, B.K., Griffiths, C.L., McQuaid, C.D., Barker, N.P., Borgonie, G. & Beheregaray, L.B. (2009) Tri-locus sequence data reject a Gondwanan origin hypothesis” for the African/South Pacific crab genus Hymenosoma. Molecular Phylogenetics and Evolution, 53, 23–33.
http://dx.doi.org/10.1016/j.ympev.2009.05.031Windsor, A.M. & Felder, D.L. (2014) Molecular phylogenetics and taxonomic reanalysis of the family Mithracidae MacLeay (Decapoda: Brachyura: Majoidea). Invertebrate Systematics, 28, 145–173.
http://dx.doi.org/10.1071/IS13011