Studies on the morphology and anatomy of the Antarctic nudibranch genera Pseudotritonia Thiele, 1912 and Telarma Odhner, 1934 with a discussion of the family Gharcotiidae Odhner, 1926 (Nudibranchia: Opisthobranchia)

The external morphology and anatomy of the Antarctic nudibranchs Pseudotritonia quadrangularis Thiele, 1912, P. gracilidens Odhner, 1944 and Telarma antarctica Odhner, 1934 are redescribed. Both genera, which were only known by two or one specimen, do not possess a cnidosac, but there is a terminal swelling at the termination of the digestive glandular ramifications in P. gracilidens. This sac is composed of cells with a large vacuole. A glandular stripe on the right side of the body above the genital openings, nephroproct and anal papilla is considered to be a synapomorphy for both genera. The validity of the family Charcotiidae and the affinities to the aeolid genus Notaeolidia Eliot, 1905 and taxa of the Arminacea are discussed.