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On the structure of gillpalp system in Solemya relum, character of feeding of the Solemyidae and their status in the system of Protobranchia (Bivalvia)

On the structure of gillpalp system in Solemya relum, character of feeding of the Solemyidae and their status in the system of Protobranchia (Bivalvia)

Zoologicheskii Zhurnal, 626: 830-839

S. velum Say (Solemyidae, Protobranchia) occurs in shallow waters of the Atlantic coast of the USA and is a seston phage-filtrator feeding on the organic matter of the water entering the burrow. Its gills are of protobranchial type but much larger than in representatives of the other families of the Protobranchia, consist of a greater number of gill leaflets unfolded dorsoventrally and occupying, as a whole, a major part of the intramantle cavity. The labial palps are greatly reduced and only capable to direct the food material settled from water and directed to them by the gills to the mouth opening, like in all true seston phagers of the Bivalvia. The bends of U-like burrow replace siphons absent in S. velum. A similar structure of the gill-palp system, way of life and character of feeding are characteristic of all other Solemyidae. The only species with the completely reduced intestine, S. reidi began to feed on the molecular organic matter dissolved in water. The gill-palp mechanisms of the Autobranchia could have evolved from the gill-palp system of the early Paleozoic ancestors of the contemporary Solemyidae.

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Accession: 021491636

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