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Free Content Structure and Adaptation in Transennella Tantilla (Gould) and Gemma Gemma (Totten) (Bivalvia: Veneridae)

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Transennella tantilla (Gould) occurs on the Pacific Coast of North America, from Alaska to Lower California. Gemma gemma (Totten) is an Atlantic species, occurring from Nova Scotia to Florida, Texas, and the Bahamas. It was found on the west coast of the United States also, from Puget Sound to San Diego, including the shores of San Francisco Bay; originally it was introduced from Chesapeake Bay, at about 1899. A detailed comparative study of the structure, adaptation, and functional morphology of these two species was made in California, during 1967. The juveniles of both species have the capacity to construct byssus threads, which are retained in the adult in T. tantilla. This condition is very uncommon for the Veneridae. The siphons of both species are relatively short and fused along half of their lengths. The anatomy and functioning of the simplified stomachs are described in detail. The stomachs belong to type V, as defined by Purchon, though they are simplified. T. tantilla and G. gemma have brood protection habits. Juveniles were found in both species in February, March, and April.

Document Type: Research Article

Publication date: December 1, 1971

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