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The zoogeographic implications of the prosobranch gastropods of the Moin Formation of Costa Rica

The zoogeographic implications of the prosobranch gastropods of the Moin Formation of Costa Rica

American Malacological Bulletin 10(2): 251-255

The deposits of the Moin Formation are located in and around the town of Puerto Limon, on the Caribbean coast of Costa Rica. The fossils date the formation as being Late Pliocene to early Pleistocene in age. The systematics of its constituent prosobranch gastropods were studied, and comparisons made with Recent and fossil gastropod faunas in the Caribbean area. Seventy-one percent of the taxa are living species and for most, this is their first occurrence in the fossil record. These are primarily Caribbean species, but West African/Mediterranean, Panamic and Indo-Pacific elements are also present. Twenty-one percent of the taxa are endemic to these beds, and 8% are typically Mio-Pliocene species occurring for the last time in the fossil record. A number of species characteristic of the Moin formation have a Holocene distribution in the western Caribbean, extending approximately from the Gulf of Honduras to the northern coast of Colombia, while others have a southern Caribbean distribution, from Costa Rica to across northern South America. These zoogeographic patterns are not well-defined, however, and based on the prosobranch species occurring in the Moin Formation, the existence of specific faunules or other zoogeographic entities in the Southwestern Caribbean area cannot be supported.

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Accession: 009638960

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