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Sympagohydra tuuli gen. nov. and sp. nov. (Cnidaria: Hydrozoa) a cool hydroid from the Arctic sea ice

Published online by Cambridge University Press:  08 September 2008

S. Piraino ,
B.A. Bluhm ,
R. Gradinger  and
F. Boero
S. Piraino*
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università degli Studi del Salento, 73100 Lecce, Italy
B.A. Bluhm
Affiliation:
School of Fisheries and Ocean Sciences, Institute of Marine Science, University of Alaska Fairbanks, Fairbanks AK 99775, USA
R. Gradinger
Affiliation:
School of Fisheries and Ocean Sciences, Institute of Marine Science, University of Alaska Fairbanks, Fairbanks AK 99775, USA
F. Boero
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università degli Studi del Salento, 73100 Lecce, Italy
*
Correspondence should be addressed to: S. Piraino, Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università degli Studi del Salento, 73100 Lecce, Italy email: stefano.piraino@unile.it
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Abstract

A new interstitial hydroid, Sympagohydra tuuli, has been collected from the three-dimensional brine channel system of the coastal fast ice off Barrow, Alaska (71°N 156ºW) in 2003 to 2006. This is the first cnidarian species described from the sea ice interstitial habitat. A morphological and systematic account of the new species is provided here. The hydroid stage is represented by solitary naked polyps, which become almost spherical under contraction. Body length can vary from 200 µm to >1 mm according to the degree of relaxation. The aboral side is extensible into a tubular foot-like projection made by epidermal tissue only, a typical feature of representatives of Protohydridae, order Capitata. However, in contrast to the other two known Protohydridae species, S. tuuli is characterized by three to four solid filiform tentacles, armed with microbasic mastigophore and desmoneme cnidocysts, and located at the base of a short hypostome bearing stenoteles. A small number of mastigophores are also scattered along the body column. Due to its unique combination of features, this taxon is designated here as a new species, and the new genus Sympagohydra is established as a new member of the class Hydroidomedusa, subclass Anthomedusae, order Capitata, family Protohydridae, to accommodate S. tuuli.

Keywords

sympagic faunainterstitial faunaArctic sea iceCnidariaHydrozoaProtohydridaeSympagohydra tuulinew speciesnew genus
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Special Issue 8: Hydrozoans , December 2008 , pp. 1637 - 1641
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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