New records of scaphopods from the coasts of Jalisco and Colima, Mexico

Abstract

The distribution of two species of scaphopods is extended south to the coast of Jalisco and Colima, México. Samples were taken with a Van Veen grab at depths between 41 and 75 m in medium sand, sandy silt and silty clay substrates. These species are: 1) Dentalium neohexagonum Sharp and Pilsbry, 1897, previously
reported from Monterey Bay, California to Tiburón Island in the Gulf of California at depths of 7-256 m; it was collected in Jalisco at 72-75 m in sandy silt and silty clay; 2) Gadila fusiformis Pilsbry and Sharp,
1898, recorded in Monterey, California, in San Carlos, Sonora and in Cabo San Lucas and the Gulf of California at depths of 7-365 m; it was collected in Colima and Jalisco, at 41 and 73 m in medium sand and silty clay substrata, respectively. The vertical distribution of another scaphopod species is also extended: Cadulus albicomatus Dall, 1890, previously registered between 733 and 3-050 m, it was collected in three localities at depths of 41, 48 and 73 m. The abundance and the frequency of occurrence of these species in the sampling stations is presented.