First species of the genus Plaxiphora Gray, 1847 (Mollusca: Polyplacophora) from the Paleocene of Europe

Author:

Sirenko B.I.1,Dell’Angelo B.2

Affiliation:

1. Zoological Institute, Russian Academy of Sciences, Universitetskaya Emb. 1, 199034 Saint Petersburg, Russia

2. Via Briscata 16/6, 16154 Genova, Italy

Abstract

The first species of the genus Plaxiphora from the Paleocene of Ukraine is described. The characteristic features of Plaxiphora luzanovkae sp. nov. are the strongly increasing size of tegmentum granules toward the edge of the valve, a large number of micraesthetes on these granules, and a random arrangement of the granules. Since the predominant occurrence of the species of the genus is in the Southern Hemisphere, with almost half found in New Zealand and Australia, it is likely that the first species of the genus originated during the final disintegration of Gondwana.

Publisher

Zoological Institute of the Russian Academy of Sciences

Reference13 articles.

1. Barron E.J., Harrison C.G.A., Sloan J.L. and Hay W.W. 1981. Paleogeography, 180 million years ago to the present. Eclogae Geologicae Helvetiae, 74(2): 443–470.

2. Beu A.G. and Maxwell P.A. 1990. Cenozoic Mollusca of New Zealand (drawings by R.C. Brazier). New Zealand Geological Survey Paleontological Bulletin, 58: 1–518.

3. Cotton B.C. and Godfrey F.K. 1940. The Molluscs of South Australia. Part II. Scaphopoda, Cephalopoda, Aplacophora and Crepipoda. In: British Science Guild, South Australian Branch Handbook of the Flora and Fauna of South Australia. Frank Trigg, Adelaide: 317–600.

4. Gray J.E. 1847. A list of the genera of recent Mollusca, their synonymy and types. Proceedings of the Zoological Society of London, 15: 129–206. https://doi.org/10.1111/j.1469-7998.1847.tb00164.x

5. Kaas P. and Van Belle R.A. 1994. Monograph of living chitons (Mollusca: Polyplacophora). Volume 5. Ischnochitonidae: Ischnochitoninae (concluded), Callistoplacinae; Mopaliidae. Additions to Volumes 1–4. E.J. Brill, Leiden, 402 p. https://doi.org/10.1163/9789004431713

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