Diaulula punctuoalata (d'Orbigny, 1837)

(Figures 2C, 2D, 3D)

Material examined. Argentina, Río Negro: Las Grutas, one specimen, 10m, 2007 (MLP-Ma 14655); Las Grutas, one specimen (MLP-Ma 13528); Caleta Los Hornitos, one specimen, intertidal, 02/2017; San Antonio Este, Punta Villarino, two specimens (MACN 13368); San Matías gulf, SAO campaign, station 117, one specimen (MLP-Ma 14177) .

Description. Length up to 100 mm, body color varies from whitish to yellowish, some specimens presenting two rows of dark spots that extend from the rhinophores to the gill. Dorsal mantle densely covered by thin caryophyllidia. Rhinophoral and branchial sheaths elevated, covered with caryophyllidia. Oral tentacles digitiform. 6-7 bipinnate gill leaves around the anal papilla (Figure 2C). Foot bilabiate; upper lip notched. The radular formula is 24 x 27.0.27. (MLP-Ma 14655). Lateral teeth simple and smooth (Figure 3D).

Geographic distribution and depth range. Argentina, Buenos Aires (37°50´S; 56°11´W) (Carcelles 1950), Nuevo gulf, in the Magellanic Province (Atlantic Ocean), throughout the Pacific Magellanic Province, to Arica, northern Chile, in the Peruvian Province (Pacific Ocean) (Valdés & Muniain 2002). Common in the SMG on rocky bottoms between six and 25 m depth .

Biology. The egg mass in a whitish wavy gelatinous ribbon about 70 mm long, with up to four complete spiral turns (Figure 2D).

Remarks. Magellanic species occasionally found in the Peruvian Province. This species is clearly differentiated from Diaulula hispida by the absence of the crest note (Valdés & Muniain 2002).