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A new species of Dahmsopottekina (Copepoda: Harpacticoida: Huntemanniidae) from the western Mediterranean deep sea

Published online by Cambridge University Press:  14 December 2011

Katerina Sevastou ,
Paulo Henrique Costa Corgosinho  and
Pedro Martínez Arbizu
Katerina Sevastou*
Affiliation:
Hellenic Centre for Marine Research, Institute of Oceanography, PO Box 2214, 71003 Heraklion, Crete, Greece
Paulo Henrique Costa Corgosinho
Affiliation:
Unesco–HidroEX Foundation/Research Department, Rua Tiradentes 325, Centro Frutal-MG, Brazil 8 38200-000
Pedro Martínez Arbizu
Affiliation:
Senckenberg am Meer Wilhelmshaven, Abt. DZMB, Südstrand 44, 26382, Wilhelmshaven, Germany
*
Correspondence should be addressed to: K. Sevastou, Hellenic Centre for Marine Research, Institute of Oceanography, PO Box 2214, 71003 Heraklion, Crete, Greece email: sevastou@hcmr.gr
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Abstract

A new species of the genus Dahmsopottekina is described from the Mediterranean Sea. Dahmsopottekina guilvardi sp. nov. was collected from abyssal habitats at a depth range of 2340–2850 m. Like its congeners, the new species has a vermiform habitus, a highly transformed P1 in both sexes and a plough-like rostrum in the female. Dahmsopottekina guilvardi sp. nov. can be distinguished from its congeneric species by the combination of a fused basis and endopodite in P1 of both sexes and the absence of an endopodite in P2–P4 of the female. Dahmsopottekina guilvardi sp. nov. is the second record of a harpacticoid species after its congener D. peruana in which the basis and endopodite of a leg other than the P5, namely the P1, are fused. Furthermore, the new species is the only one among Dahmsopottekina species with a 1-segmented P1 exopodite in the male. Similar to its congeners, D. guilvardi sp. nov. is strongly sexually dimorphic. This is evident through the morphology of most of the cephalic appendages and the reduction of P2–P6 in the female. The results of the present study support the observation that Dahmsopottekina species are sparsely distributed and highly endemic. Nevertheless, our results do not agree with the statement of considerably larger females as the length variability between females is greater than between the two sexes. Despite the morphological characters of the species commensurate with a burrowing mode of life, its presence in sediment traps suggests that D. guilvardi sp. nov. is an active ‘swimmer’.

Keywords

Dahmsopottekina guilvardi sp. nov.CopepodaHarpacticoidaHuntemanniidaeMediterraneandeep sea
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 5 , August 2012 , pp. 1043 - 1055
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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