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First records and range extensions for two Acesta clam species (Bivalvia: Limidae) in the Gulf of California, Mexico

Published online by Cambridge University Press:  17 June 2014

Kristine R. Walz ,
David A. Clague ,
James P. Barry  and
Robert C. Vrijenhoek
Kristine R. Walz*
Affiliation:
Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, California 95039, USA
David A. Clague
Affiliation:
Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, California 95039, USA
James P. Barry
Affiliation:
Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, California 95039, USA
Robert C. Vrijenhoek
Affiliation:
Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, California 95039, USA
*
Correspondence should be addressed to: K.R. Walz, Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039 email: kwalz@mbari.org
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Abstract

Two species of limid clams, Acesta sphoni and Acesta mori, were observed and sampled from seven localities in the Gulf of California, Mexico. The two species are known to occur on seamounts and escarpments along the north-eastern Pacific margin of the United States. This report provides the first records of each species in the Gulf of California and the greatest depth records for both species. Though they occasionally overlap geographically, the two species are clearly stratified by depth, with A. sphoni occupying shallower and warmer, hypoxic waters, and A. mori occupying deeper and colder, oxic waters. The species are easily distinguished morphologically. The shells of A. mori have very fine radial ribbing for a smooth appearance and are more rounded and inflated, whereas those of A. sphoni are narrower and more elongate with 31 to 77 strong radial ribs. The largest individuals sampled were A. sphoni. For each species, DNA analyses revealed arrays of mitochondrial haplotypes similar to those found previously at north-eastern Pacific localities along the California, Oregon and Washington margins, providing no evidence for geographical subdivision throughout this newly extended range.

Keywords

AcestaLimidaeGulf of Californiadeep-sea clamrange extensionfirst record
Type
Research Article
Information
Marine Biodiversity Records , Volume 7 , 2014 , e60
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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