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Deep-sea wood-boring bivalves of Xylophaga (Myoida: Pholadidae) on the Continental Shelf: a new species described

Published online by Cambridge University Press:  22 July 2008

Janet R. Voight
Janet R. Voight*
Affiliation:
Department of Zoology, The Field Museum, 1400 S. Lake Shore Drive, Chicago, IL 60605, USA
*
Correspondence should be addressed to: Janet R. Voight, Department of Zoology, The Field Museum, 1400 S. Lake Shore Drive, Chicago, IL 60605, USA email: [email protected]
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Abstract

Deep-sea organisms are generally considered to be restricted to the great ocean depths, unable to enter shallower habitats except perhaps at the isothermic polar latitudes, due to physiological constraints, or more intense biotic interactions. Wood-boring bivalves of Xylophaga, however, are here shown to be exceptional. A clade, formally recognized by Turner in 2002, united by the derived characters of a complex mesoplax and a truncated excurrent siphon, papillose incurrent siphon with a longitudinal dorsal trough bordered by lappets, and often carrying white or glass-like granules, occurs at significantly shallower and warmer depths than do other species of the genus. Here, description of the new species X. multichela from 106 m depth off the Pacific coast of Guatemala illustrates the characters that unite the clade. Because wood-boring bivalves face intense competition and high levels of predation at depths of 2200 to 3250 m, they may not perceive biotic interactions at shallower depths to be dramatically more intense. In addition, members of this group are hypothesized to tolerate reduced oxygen availability, a requisite if animals are to occur in warm waters.

Keywords

Xylophagainaeon-shore migrationpredationcompetitionhypoxia
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 7 , November 2008 , pp. 1459 - 1464
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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