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Retiolitid graptolite Spinograptus from Poland and its membrane structures

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Kozlowska-Dawidziuk A.

Acta Palaeontologica Polonica

1997

tom 42

nr 3

391-412

Spinograptus reticulolawsoni sp. n., S. latespinosus sp. n., S. cf. latespinosus, and S. sp. are described from borecore samples of the late Wenlock (Colonograptus? praedeubeli Zone), of the Bartoszyce borehole, NE Poland. They represent an early diversification phase of retiolitids, which followed the Cyrtograptus lundgreni Event. Some species display a combination of primitive and advanced characters, implying a mosaic paffern of Spinograptus evolution. Most of the material studied contains continuous peridermal membranes, suggesting that they may have been universally present in the retiolitids. Long (2 mm) siculae found in two species of Spinograplus contrast with short siculae, known for Retiolites and Paraplectograptus.

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1 Acta Palaeontologica Polonica

1 Kozlowska-Dawidziuk A.

1 1997

Wyniki wyszukiwania

Retiolitid graptolite Spinograptus from Poland and its membrane structures