Abstract
This study reports the first record of 17 species of gastropods collected on the continental shelf off Jalisco and Colima, Mexico, in August 1988. Samples were taken with a Van Veen grab and net trawls at depths between 40 and 98 m. Substrates consisted of medium sand, sandy silt and silty clay. Previous range distributions of eight species (Cosmiconcha rehderi, Cyclostremiscus planospira, Knefastia howelli, Kurtzia elenensis, Leptadrillia fìrmichorda, Mirachelus galapagensis, Nassarina perata and Phos fusoides) included localities between Guerrero, Mexico, and Ecuador. Previous records of the other nine species (Parvanachis albodonosa, Atilliosa carmen, Knefastia walkeri, Kylix paziana, Mitrella dorma, M. xenia, Strombina solidula, Sulcoretusa paziana and Turritela anactor) included localities in the Gulf of California, Sinaloa and Nayarit, Mexico. These species belong to two subclasses, four orders, eight families and fifteen genera of gastropods. Information on abundance, distribution with respect to depth and type of substratum and range distribution is also provided.
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