Morphology and micro structure of oligo lamellar teeth in paleozoic echinoids 2. givetian middle devonian stage of evolution of oligo lamellar teeth

Jesionek-Szymanska, W.

Acta Palaeontologica Polonica 27(1-4): 195-211


ISSN/ISBN: 0567-7920
Accession: 005932691

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Oligolamellar echinoid teeth, primitive in general morphology, are represented in the Givetian of the Skaly beds (Poland) by a few types differing mainly in fine details of their adaxial surfaces which may be smooth, ledged or denticulate. These characters reflect the adaptation to particular feeding habits. A new kind of Givetian echinoid teeth, closely related to the oligolamellar one is described. In some characters such as greater number of lamellae which also are thinner, they seem to be intermediate between oligolamellar and another group of Givetian echinoid teeth, for which the name multilamellar is proposed.