Two Devonian mitrates from South Africa

Ruta, Marcello and Theron, Johannes (1997) Two Devonian mitrates from South Africa. Palaeontology, 40 (1). pp. 201-243. ISSN 0031-0239

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Abstract

The anomalocystitid mitrate Placocystella africana (Gydo and Voorstehoek shales, upper Emsian-lower Eifelian, Bokkeveld Group, Cape Province, South Africa) is redescribed. The internal anatomy of the head, the tail morphology and part of the nervous system are reconstructed for the first time. P. africana belongs to the family Allanicytidiidae, together with four other Silurian and Devonian species from Gondwana. the monophyly of the Allanicytidiidae is supported by cladistic analysis. A second mitrate from the upper Emsian of the Bokkeveld Group, Bokkeveldia oosthuizeni gen. et sp, nov. from the Gydo Shale, is described. The distinctive ventral head skeleton of thi mitrate consists of 22 plates arranged in five transverse rows and is used as a reference to establish plate homologies in the anomalocystitids.

Keywords:Allanicytidiidae, Anomalocystitida, Bokkeveldia, Placocystella, Lower Devonian, South Africa
Subjects:C Biological Sciences > C300 Zoology
F Physical Sciences > F641 Palaeontology
Divisions:College of Science > School of Life Sciences
ID Code:9311
Deposited On:03 May 2013 20:33

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