The southernmost range of the geographic distribution of Erosaria acicularis (Caenogastropoda, Cypraeidae) is extended from north coast of Rio de Janeiro state to the north coat of São Paulo state. This observation is based on living specimen found in Ilha Bela municipality.
Eulimostraca subcarinata, a new eulimid species from Angra dos Reis bay, Rio de Janeiro, is described based on shells. As main characters are the almost straight profile of the spire, the carinate last whorl and the minute size (little more than 2 mm). This is the first record of the genus to the Brazilian coast.
This paper is developed based on descriptive studies published elsewhere. It aims to analyze the morphological data on a set of littorinoidans and rissooideans looking for the understanding their phylogeny and their relationships with remaining Caenogastropoda taxa. The examined set of species is relatively small, but considered sufficient for above mentioned analysis. The phylogenetic study revealed the monophyly of the Rissooidea, being the littorinoideans a paraphyletic arrangement of basal branches. A total of 44 morphological characters (59 states) is analyzed. Its analysis resulted in the following cladogram: (Littorina flava (Annularia sp. (Amphithalamus glabrus (Potamolithus ribeirensis (P. karsticus – P. troglobius))))). A set of 14 morphological synapomorphies supports this monophyly.
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