Nudibranchia (Mollusca: Gastropoda) from San Matías Gulf, Northern Argentine Patagonia Author Cetra, Nicolás Escuela Superior de Ciencias Marinas (ESCiMar), San Martín 247, San Antonio Oeste, Río Negro, Argentina. Author Roche, Andrea Escuela Superior de Ciencias Marinas (ESCiMar), San Martín 247, San Antonio Oeste, Río Negro, Argentina. & Centro de Investigación y Transferencia Tecnológica en Recursos Marinos Almirante Storni (CIMAS), Güemes 1030, San Antonio Oeste, Río Negro, Argentina. text Zootaxa 2023 2023-02-22 5244 5 455 473 http://dx.doi.org/10.11646/zootaxa.5244.5.3 journal article 10.11646/zootaxa.5244.5.3 1175-5326 21F87739-7A95-4A6C-8887-A8E22A40120A Diaulula hispida (d'Orbigny, 1834) Material examined . Argentina , San Matías gulf, Caleta Los Hornitos , BENTOS 2008, two specimens , 65 m (ESCM-Ma-22) . Description . Length up to 80 mm , body whitish with brown dots, or body completely brown to dark brown. Undulating dorsal ridge. Mantle covered by very thin caryophyllidia, forming a collar at the base of the rhinophores. 6-7 tripinnate gill leaves surround the anal papilla. Oral tentacles digitiform. Foot bilabiate, with upper lip notched. The radular formula is 24 x 32.0.32. The lateral teeth are simple and smooth. Geographic distribution and depth range . Argentina , from Comodoro Rivadavia, Chubut to central Chile in Valparaiso , Chile ( Schrödl 1996 , 1997a , 2000, 2003). Found at 65 m depth. Remarks . According to Valdés & Gosliner (2001) D. hispida is characterized by a notum ridge, common to the members of the genus Atagema Gray, J.E. 1850 (= Trippa see Marcus 1959 ). On the contrary, Marcus (1959) considered that this species fits better within the genus Diaulula , due to morphological differences in the mouth of Trippa species. Until more information is available, D. hispida should be maintained in Diaulula ( Schrödl 2003 ) .