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The AAPG/Datapages Combined Publications Database

New Orleans Geological Society

Abstract


Geology and Hydrogeology of Northeastern Yucatan, 1978
Pages 113-133

Recent Marine Molluscs from Northeastern Quintana Roo, Mexico1

Allan A. Ekdale

ABSTRACT

A benthic survey along the northeastern coast of Quintana Roo, Mexico, yielded 316 species of shallow-marine molluscs. R-mode cluster analysis defined three primary assemblages of molluscs based on their relative abundances in quantitative samples collected with a diveroperated suction dredge. The assemblages represent organisms living in environments of (a) restricted circulation, (b) open marine circulation and (c) swift currents. An intertidal assemblage is outlined from miscellaneous collections and direct observations of molluscs along the rocky shore.

Almost all live molluscs collected were accompanied by dead shells of their species in the same sample. Worn shells are uncommon, and counts of disarticulated bivalves reveal nearly equal left-rignt distributions in the samples. Long-range transport of shells by waves and currents and mixing of faunal assemblages after death is considered to be insignificant.


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