GENUS ALDISA BERGH, 1878

Aldisa Bergh, 1878b: XXXVIII. Type species: Doris zetlandica Alder & Hancock, 1854, by monotypy.

Diagnosis

Dorsum covered with simple tubercles, stiffened by integumentary spicules, which do not protrude from the dorsal surface. Anterior border of the foot grooved, but not notched. Head with two lateral prolongations. Labial armature lacking rodlets. Radula composed of very thin and elongate teeth, which have a triangular base and denticles on the apex and outer edge. Reproductive system with a tubular, granular and simple prostate. Penis armed with hooks. Vestibular or accessory glands absent.

Remarks

Bergh (1878b) described the genus Aldisa based on Doris zetlandica Alder & Hancock, 1854, and defined using radular characters. The radula of Aldisa was described as having erect teeth, staff-shaped, with a serrated external edge.

Since the original description several species have been assigned to this genus, later reviewed by Millen & Gosliner (1985). All of them share the presence of very elongate radular teeth, with a wide, triangular base, and denticles on the outer edge and the cusp.