Alkmaria Horst, 1919

Prostomium anteriorly truncated, trilobed. Buccal tentacles smooth. Oral membrane short, smooth and folded. Prostomial dorsal glandular ridges absent. Branchiae 3 pairs. All branchiae similar, all smooth, none basally flanged. Branchiae in two groups inserted mid-dorsally, connected basally, the 3 branchiae of each group arranged in a triangle and connected at the bases. Paleae on segment 3 absent. Dorsal crest absent. Nuchal (post branchial) hooks on segment 4 absent. Notopodia all similar. Notochaetae present from segment 4. Neuropodia present, tori of similar length throughout thorax. Segments 3–6 without neurochaetae. Number of pairs of thoracic uncinigers 13. Abdominal notopodial rudiments absent. 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.;
Holthe, T. 1986. Polychaeta Terebellomorpha from the northern Norwegian Sea and the Polar Sea, with descriptions of Mugga bathyalis sp.n. and Ymerana pteropoda gen. and sp.n. Sarsia 71, 227-234.;
Holthe, T. 1986. Polychaeta Terebellomorpha. Norwegian University Press, Norway.