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— Individual linear growth in 26 specimens of Anodonta beringiana is studied by measuring the successive annual rings on the surface of the shells. It is shown that the growth of mollusks is well described by the von Bertalanffy growth equation. The coefficients of this equation do not significantly differ between individuals, averaging k = 0.062 ± 0.011 year–1 and L∞ = 155.8 ± 19.5 mm. Species lifespan,...
Se estudia el contenido malacológico de 3 “terrazas marinas” (TM) que afloran a lo largo de 250 km en la provincia de Santa Cruz. Se han identificado 49 moluscos (33 Gastropoda y 16 Bivalvia) y los primeros registros cuaternarios de Ataxocerithium pullum, Crepidula protea, C. aculeata, Adelomelon ferrusacii, Brachidontes rodriguezi, Aequipecten tehuelchus, Ostrea tehuelcha y Solen tehuelchus. Las...
The Menderes Metamorphic Massif is located between the Izmir-Ankara zone to the north, and theLycianinappes and Bey Daglari platform to the south in the western part of Turkey. The massif consists of core rocks of Precambrian to Cambrian gneisses, schists, metagranites, and cover rocks of Paleozoic micaschists and marbles, Mesozoic thick bedded platform-type metacarbonates, and Lower Tertiary pelagic...
The Lower Devonian genus VlastaBarrande, 1881 (Vlastinae, Antipleuridae) represents the oldest known bivalve with a sinistrally twisted shell, that relates to a shallow endobyssate mode of life in unstable biodetrital sediment. Detailed study shows that the shells lacked the gapes described by Barrande in the last century. The subfamily Vlastinae, originally established for Lower Paleozoic Bivalvia...
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