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Kerguelenica Petrescui (Crustacea: Cumacea), a New Species from Australian Waters

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Abstract Kerguelenica is a genus that was originally described on the basis of female specimens collected off the coast of the Kerguelen Islands by M. Ledoyer in 1977. At the time, Kerguelenica was recognized as a problematic genus in that the family placement was unclear due to the lack of male specimens, and Ledoyer (1977) placed the genus in Pseudocumatidae with some unease. We describe a new species of Kerguelenica from specimens collected from the continental slope of Australia and Tasmania, from depths of 1000-1800 m. The adult male and ovigerous female are fully described and figured. The new species can be distinguished from the only other species in the genus, K. platycephala, by several characters. The new species has an ocular lobe, lacks a pair of dorsal protuberances on the carapace, in maxilliped 3 the ischium is present and the merus is very broad but the carpus is less broad than the merus, the basis of pereiopod 3 is slightly shorter than twice the length of the other articles together, and the telson is more than half the uropod peduncle length. In comparison, K. platycephala has no ocular lobe, bears a pair of dorsal protuberances on the carapace, maxilliped 3 is without an ischium and both the merus and carpus are broad, the basis of pereiopod 3 is 1.5× the other articles together, and the telson is half the length of the uropod peduncles. In other respects, the two species are quite similar in appearance. However, the description of the new species and especially the adult male do not resolve the issue of the family affinity of the genus.

Affiliations: 1: a (SG, corresponding author) University of Alaska, Anchorage, 3211 Providence Dr., Biological Sciences, Anchorage, Alaska 99508, U.S.A. ; 2: b (AM) Department of Zoology, Martin Ryan Marine Science Institute, National University of Ireland, Galway (SG: sarah.gerken@uaa.alaska.edu, AM: Alison.McCarthy@NUIGALWAY.IE)

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1. Băcescu M. 1992 "Cumacea II (Fam. Nannastacidae, Diastylidae, Pseudocumatidae, Gynodiastylidae et Ceratocumatidae)." In, H.-E. Gruner and L. B. Holthuis, (eds.), Crustaceorum Catalogus, Pars 8. SPB Academic Publishing The Hague, 175-468 pp
2. Coleman C. O. 2003 "Digital Inking. How to make perfect line drawings on computers." Organisms, Diversity and Evolution 3, Electronic Supplement Vol 14 1 14
3. Corbera J. 2000 "Systematics and distribution of cumaceans collected during BENTART-95 cruise around South Shetland Islands (Antarctica)." Scientia Marina Vol 64 9 28
4. Ledoyer M. 1977 "Cumacs (Crustacea) del Iles Kerguelen recueillis par le N. O. La Japonaise en 1972 et 1974 et par le M. S. Marion-Dufresne en 1974." Comite National Franais des Recherches Antarctiques Vol 42 193 213
5. Poore G. C B. , Just J. , Cohen B. F. 1994 "Composition and diversity of Crustacea Isopoda of the southeastern Australian continental slope." Deep-Sea Research I, Vol 41 677 693
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/content/journals/10.1651/07-2916r.1
2008-01-01
2016-12-07

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