Anobothrus Levinsen, 1884

Prostomium anteriorly truncated, trilobed. Buccal tentacles smooth. Prostomial dorsal glandular ridges absent. Branchiae 4 pairs. All branchiae similar, all smooth, none basally flanged. Only last pair of branchiae clearly associated with a specific segment. Paleae on segment 3 present, long. Dorsal crest present, on either segments 8 or 9 or on segment 14. Nuchal (post branchial) hooks on segment 4 absent. Notopodia with one pair elevated, on chaetiger(s) 11–12. Notochaetae both smooth and distally hirsute, present from segment 3. Notochaetae of chaetiger 11 are modified, being shorter and distally hirsute; the notopodia of chaetiger 11 are connected by a ciliated dermal ridge across the dorsum. Neuropodia present, tori of similar length throughout thorax. Segments 3–6 without neurochaetae. Number of pairs of thoracic uncinigers 12. Abdominal notopodial rudiments present. Anal cirri absent.

Description generated from: Hutchings, PA & Johnson, RT, 2003. Australian Ampharetidae (Polychaeta) DELTA database. In Wilson RS, Hutchings PA & Glasby CJ (eds) Polychaetes: Interactive Identification and Information Retrieval. CSIRO Publishing, Melbourne.

Additional references:
Fauchald, K. 1977. The polychaete worms. Definitions and keys to the orders, families and genera. Natural History Museum of Los Angeles County, Science Series 28, 1-188.
Williams, SJ. 1987. Taxonomic Notes on some Ampharetidae (Polychaeta) from Southern California. Bulletin of the Biological Society of Washington 7, 251-258.
Clarke, A.; Johnston, N.M. (2003). Antarctic marine benthic diversity. Oceanography and Marine Biology: an Annual Review 41: 47-114.
Imajima, M., Reuscher, M. G., & Fiege, D. (2013). Ampharetidae (Annelida: Polychaeta) from Japan. Part II: Genera with elevated and modified notopodia. Zootaxa, 3647(1), 137-166.