Anobothrus Levinsen 1844

Dataset
A new species of Anobothrus (Polychaeta, Ampharetidae) from the Weddell Sea (Antarctica), with notes on habitat characteristics and an updated key to the genus: Rank
GENUS

Classification

kingdom
Animalia: phylum
Annelida: class
Polychaeta: order
Terebellida: family
Ampharetidae: genus
Anobothrus

diagnosis

Generic diagnosis (after Alalykina & Polyakova (2020), Bonifácio et al. (2015), Imajima et al. (2013), Jirkov (2009) and Reuscher et al. (2009 )) Prostomium trilobed, Ampharete - type (Jirkov 2009), without glandular ridges. Buccal tentacles smooth or papillose. Segments 2 and 3 can be fused; notochaetae on either segment 2 or 3 reduced, or developed in both segments. Three or four pairs of smooth or papillose branchiae; three pairs arising from segments 2 – 4 arranged in a transverse row, with or without a gap; fourth pair, if present, behind this row and originating from segment 5. A pair of median nephridial papillae, if present, behind branchiae. Chaetae on segment 2 present and developed as paleae, or absent. Notopodia and notochaetae on segment 3 may be reduced or present. 16 – 17 thoracic segments, 14 – 16 thoracic chaetigers, and 11 or 12 thoracic uncinigers starting at segment 6. Notopodial cirri present or absent. Circular glandular band on thoracic unciniger 1, 2 or 3. Fourth-, fifth- or sixth-to-last thoracic unciniger with one, two or three modifications: elevated notopodia, a more or less pronounced glandular ridge between notopodia, and modified notochaetae. Subsequent thoracic uncinigers without modification but prolongated. One or two intermediate segments. Abdominal rudimentary notopodia absent. Pygidium with anus terminal, with or without numerous papillae, or with or without anal cirri.

discussion

Remarks This generic diagnosis combines diagnoses proposed by Alalykina & Polyakova (2020), Bonifácio et al. (2015), Imajima et al. (2013), Jirkov (2009) and Reuscher et al. (2009), and follows the terminology of counts used by Imajima et al. (2012, 2013) and Reuscher et al. (2009). Ampharetidae are usually known for a constant number of thoracic chaetigers and uncinigers for adult individuals (Reuscher et al. 2009; Stiller et al. 2020 for exclusion of Melinnidae).

type_taxon

Type species Ampharete gracilis Malmgren, 1866.

Name

Synonyms: Melythasides Desbruyeres 1978
Homonyms: Anobothrus Levinsen 1844; Anobothrus Levinsen 1844