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Corpus Systématique Animale

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Prodissoconch morphology is environmentally modified in the brooding bivalve Lasaea subviridis

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Springer (journals)
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  • D. Ó Foighil
  • Department of Biology, University of Victoria, P.O. Box 1700, V8W 2Y2, Victoria, British Columbia, Canada

Embryonic shell sculpture of intertidal and laboratory brooded individuals of the direct developer Lasaea subviridis was studied using scanning electron microscopy. Intertidally brooded individuals develop a distinct prodissoconch I (PI) and prodissoconch II (PII) of unusual morphologies. The PI is relatively small (50–100 ?m in length), oval in outline, lacks a radial sculpture and is restricted to the initial pitted zone of the prejuvenile shell. A larger PII is formed (510–680 ?m in length) and it is dominated by pronouced commarginal striae but also includes a belt of radial ridges extending from the PI/PII boundary. Laboratory brooded individuals kept constantly submerged do not develop the pronounced commarginal striae characteristic of PII. This implies that PII formation in L. subviridis is not a direct result of the brooding habit, and can be modified by environmental factors, which possibly include low-tide exposure. There is no single feature of external prodissoconch morphology that unambiguously indicates a direct development mode combined with mantle cavity brood protection. General guidelines are presented to help recognize this developmental mode, based on prodissoconch morphology. In comparing prodissoconch morphologies of brooding bivalves, the habitats as well as the phylogenies of species should be considered, especially in comparisons of intertidal and subtidal species.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - invertebres
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Ecology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - marine & freshwater biology
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Marine Biology

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  • Mollusques
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