Discovery of the micromorphic brachiopod Lambdarina from the Lower Carboniferous of Long’an, Guangxi, with remarks on the evolutionary history of the superfamily Lambdarinoidea
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Abstract:
A species of the superfamily Lambdarinoidea (Brachiopoda), namely Lambdarina cf. sinensis, from the Tournaisian of Long’an, Guangxi is described herein. The evolutionary history of this micromorphic rhynchonellid group is discussed based on their geologic and palaeogeographic distribution from the reported fossil records. The early lambdarinoids seem to appear first in central Europe during the Famennian and then migrated to the South China Plate where they experienced a biodiversification during the Tournaisian. The late Tournaisian and Visean witnessed the dispersal of succeeding lambdarinoid taxa to Europe of the western Paleo-Tethys Ocean and Australia on the northeastern margin of the Gondwana. Two evolutionary lineages are proposed here according to shell outlines and development of median ridge-like folds on the ventral valve. The lambdarinoids are supposed to favor warm and low-energic habitats at low latitude.
