Lyratoherpia Salvini-Plawen, 1978
 

Type species. -- Lyratoherpia carinata Salvini-Plawen, 1978, original designation.
 

Distribution. -- Ross Sea, South Shetland Islands (L. carinata ), off southwest Africa (undescribed species), and West European Basin (L. incali) from 800 m in southern oceans to >2,000 m in the northeast Atlantic.

Elongate, anteriormost end pointed, posterior end fingerlike above a rounded ventral lobe in mature individuals; with two types of solid upright epidermal spicules; cuticle and epidermis thin; radula monostichous, each tooth with four curved denticles, the inner pair fused at tips, the lateral pair swung outwards; paired ventral tubular salivary glands short, sharing single duct; midgut sacculate; with paired seminal vesicles and seminal receptacles; paired lower gametoducts narrow with single gametopore; with a single group of copulatory spicules within a voluminous copulatory spicule gland; with acidophilic mantle cavity glands; mantle cavity shallow, respiratory folds lacking.

From Ophelia 51 (1): 1-28 (1999).