A new species of Sabellacheres M. Sars, 1862 (Copepoda: Gastrodelphyidae) from a deep-water benthic polychaete in Antarctic waters, with a key to the species of the genus
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Specimens of a deep-living sabellid polychaete of the genus Perkinsiana Knight-Jones dredged in Antarctic waters were found to be parasitised by an undescribed species of the cyclopoid copepod genus Sabellacheres M. Sars, 1862. Specimens of both sexes were studied using light microscopy and SEM, and compared with its congeners. The new species, Sabellacheres antarcticus n. sp., can be distinguished from its congeners by the shape and proportions of the body and brood-pouch, its 4-segmented antennae, the shape and length of the distal process of the second antennular segment, the position of leg 3, and the structure of the male maxilliped. This is only the second record of a species of this genus from the southern hemisphere. The new species was found on a single host species, as is typical for most species of Sabellacheres. A key for the identification of both sexes of the species of Sabellacheres is included.
The copepod specimens examined were kindly made available to us by Brigitte Hilbig (Senckenberg Institute, Frankfurt), head of the Southern Ocean Annelid Project (SOAP), and James Blake (ENRS Marine and Coastal Center, Woods Hole). Mariana Tovar (Geomare, Mexico) and Beatríz Yáñez (ICMyL-UNAM, Mazatlán) encouraged this study; they sorted these specimens during their investigations on sabellid worms and are describing the new species of Perkinsiana, the host of our new species. Araceli Adabache and Marcelo Silva-Briano kindly processed the specimens for SEM and guided our examination of this material at the Universidad Autónoma de Aguascalientes, Mexico. We also thank Linda Ward for registering the type-specimens at the National Museum of Natural History, Smithsonian Institution, Washington, DC.
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