New species of Architectonicidae (Gastropoda Heterobranchia) from northeastern Brazil

Solatisonax rudigerbieleri n. sp., Solatisonax cabrali n. sp., Psilaxis clertoni n. sp., Pseudotorinia jonasi n. sp. and Heliacus willianseverii n. sp. are described for the continental shelf and slope off northeastern Brazil. The genera Pseudotorinia and Solatisonax are cited for the first time for the South Atlantic. Comparisons are made with other known species of the western Atlantic and the Pacific. Heliacus and Psilaxis have previously been recorded for northern and northeastern Brazil, including oceanic islands off the northeastern region. The species described here are considered endemic to northeastern Brazil.