Benthic hydroids (Cnidaria: Hydrozoa) from Peter I Island (Southern Ocean, Antarctica) |
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Authors: | Álvaro L Peña Cantero |
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Institution: | 1. Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Universidad de Valencia/Fundación General Universidad de Valencia, Apdo. Correos 22085, 46071, Valencia, Spain
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Abstract: | Twenty-three species of benthic hydroids, belonging to eight families and 13 genera, were found in a hydroid collection from
Peter I Island, collected during both the Bentart 2003 and Bentart 2006 Spanish expeditions with BIO Hespérides in 2003 and 2006. Fourteen out of the 23 species constitute new records for Peter I Island, raising the total number of known
species in the area to 30, as also do seven out of the 13 genera. The majority of the species are members of the subclass
Leptothecata; the subclass Anthoathecata being scarcely represented. Sertulariidae is the family with the greatest number
of species in the collection, with eight species (35%), followed by Lafoeidae with five (22%). Symplectoscyphus with four species (17%) and both Antarctoscyphus and Halecium with three (13%), including H. frigidum sp. nov., were the most diverse genera. Twenty species (ca. 77%) are endemic to Antarctic waters, either with a circum-Antarctic
(11 species, ca. 42%) or West Antarctic (9 species, ca. 35%) distribution. Twenty-four (ca. 92%) are restricted to Antarctic
or Antarctic/sub-Antarctic waters; only two species have a wider distribution. Peter I Island hydroid fauna is composed of
typical representatives of the Antarctic benthic hydroid fauna, though it is characterized by the low representation of some
of the most diverse and widespread Antarctic genera (Schizotricha and Staurotheca). |
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