Rostanga
sponge dorids
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Description
Rostanga is a genus of dorid nudibranchs in the family Discodorididae (some sources still place it in Dorididae). The slugs are small and red to scarlet, and they feed on red encrusting sponges such as Microciona and Ophlitaspongia. The genus includes species from the Atlantic coasts of Europe and North Africa and the Mediterranean (R. rubra), from the eastern Pacific (R. pulchra) and from the Indo-Pacific.
Identification
A small red dorid whose rhinophores have lamellae arranged vertically. The species look very alike externally, so separating them often depends on rhinophore details and on the radula (the outer lateral teeth are bifid). The eggs of R. pulchra are bright red and laid in a coiled ribbon.
Species in this genus (1)
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