Genus Euborlasia Vaillant, 1890

Type species: Euborlasia elizabethae (McIntosh, 1874) .

Diagnosis. Lineidae with pair of horizontal lateral cephalic slits; dark-colored, bulky body mottled with dark or pale dots and anterior tip paler; caudal cirrus absent; thick cutis separated from outer longitudinal muscle layer of body by thick layer of connective tissue; body wall musculature with diagonal musculature between outer longitudinal and middle circular muscle layers; nerve plexus wedged between two layers of diagonal musculature of body wall; proboscis with outer circular, diagonal, inner longitudinal, and inner circular muscle layers, with 0–2 muscle crosses (modified heterotype sensu Chernyshev 2015); vascular plexus present around foregut; neurocord and neurocord cells absent.

Remarks. Proboscis of Euborlasia gotoensis and E. proteres has outer longitudinal musculature, therefore these two species should be excluded from the genus Euborlasia . Euborlasia obscura (Friedrich, 1958) should also be excluded from the genus because it is distinguished by a caudal cirrus and a uniform body coloration (Friedrich 1958).