Redescription of Terebellides kerguelensis stat. nov. (Polychaeta: Trichobranchidae) from Antarctic and subantarctic waters

Abstract

During the Spanish Antarctic expeditions " Bentart" 1994Bentart" , 1995Bentart" and 2003, a number of trichobranchid (Annelida: Polychaeta) specimens were collected and identiWed initially as Terebellides stroemii kerguelensis McIntosh, 1885, the only known species of the genus widely recognised as valid in Antarctic waters. In the framework of a worldwide revision of the genus Terebellides, a reconsideration of the taxonomic status of this subspecies of the boreal Terebellides stroemii Sars, 1835 is done through the examination of the syntypes of T. s. kerguelensis compared with recent descriptions of the nominal species from Norwegian waters and material from Icelandic waters. Thus, T. s. kerguelensis is regarded as a valid species, T. kerguelensis stat. nov., and redescribed designating a lectotype and paralectotypes. The species is mainly characterised by the presence of an anterior branchial extension (Wfth lobe), lateral lappets in Wve anterior thoracic chaetigers, segmental organs in chaetigers 1, 4 and 5, and Wrst thoracic acicular neurochaetae sharply bent with pointed tips. The biological role of the segmental organs, the presence and disposition of cilia in branchial lamellae and the Wnding of new structures located in dorsal part of thoracic notopodia are discussed.

Distinct or similar? Soft bottom polychaete diversity in Arctic and Antarctic glacial fjords

“…Some of the recent molecular studies demonstrated the presence of bipolar species in some of the benthic invertebrate groups like amphipod crustaceans (Havermans et al, 2013), however, this result should be considered rather an exception from the rule (Brandt et al, 2012). There is a growing number of examples of polychaete species previously considered bipolar or cosmopolitan taxa turning out to be in fact species complexes (Scaps et al, 2000;Bleidorn et al, 2006;Barroso et al, 2010), and detailed taxonomic studies resulted in re-descriptions and changes in their taxonomic status (Parapar & Moreira, 2008). Nevertheless, Witman et al (2004) showed that the factors operating at different spatial scales can be responsible for the diversity patterns.…”

Sphaerodoridae (Annelida: Polychaeta) from the Bellingshausen Sea (Antarctica) with the description of two new species

“…Similarly, other polychaete taxa thought as having a wide distribution and previously reported from the Southern Ocean might actually not be represented there. This is the case of the northern trichobranchid Terebellides stroemii Sars, 1835 which was supposed to be represented at southern latitudes by the subspecies T. stroemii kerguelensis McIntosh, 1885, which recently Parapar and Moreira (2008), after revision of the type material, proposed elevated to the species rank leaving the distribution of T. stroemiilimited to northern latitudes.…”

Morphology and biology ofLaetmonice producta productaGrube (Polychaeta: Aphroditidae) in the Bellingshausen Sea and Antarctic Peninsula (Southern Ocean, Antarctica)

“…Both cruises were carried out onboard the R/V Hespérides during the austral summers of 2002-2003 and 2005-2006 respectively. Some results on polychaetes have been published by Parapar and Moreira (2008), López (2008López ( , 2010López ( , 2011, Parapar et al (2011), and Moreira and Parapar (2011).…”