Additional gastropod records from the continental shelf off Jalisco and Colima, Mexico

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

Soft-bottom decapod and stomatopod crustaceans of the continental shelf off Jalisco and Colima, Mexico

A systematic list of decapod and stomatopod crustaceans of the soft bottoms of the continental shelf off Jalisco and Colima, Mexico, is presented. The specimens were obtained as part of an integral study on the biodiversity and fisheries potential of the marine resources of the eastern tropical Pacific region. Eighty-four shrimp trawls were done at seven localities, with four stations within each locality, at 20, 40, 60 and 80 m depth. The sampling schedule was reapeated three times during one annual cycle (from May 1995 to March 1996) in order to include seasonal changes of the fauna. A total of 60 species is 13.7% of the total reported for the region between Banderas Bay and Guatemala (457 species). Some zoogeographic and biodiversity aspects are discussed that confirm previous results for the region. The extension of geographic ranges for two species is reported