The genus Placodus : systematics, morphology, paleobiogeography, and paleobiology

Title Variants

Alternative: The genus Placodus

Related Titles

Series: Fieldiana, Geology, new ser., no. 31

Series: Publication (Field Museum of Natural History), 1472

By

Rieppel, Olivier

Type

Book

Material

Published material

Publication info

Chicago, Ill, Field Museum of Natural History, 1995

Notes

"Accepted April 21, 1995. Published December 29, 1995."

Placodus gigas Agassiz, 1833, from the Muschelkalk of the Germanic Triassic, is recognized as the only valid species of its genus. Placodus gracilis Jurcsak, 1976 (pending a revision of the original material), and Placodus impressus Agassiz, 1833, are considered nomina dubia. An amended diagnosis based on homologies (synapomorphies) is provided for the genus Placodus and its only known species. The skeletal structure of Placodus is described, and the phylogenetic interrelationships of the genus are discussed. Placodonts originated along the northern coast of the Tethys, and early during their phylogeny split into two lineages, the Placodontoidea and Cyamodontoidea. Placodus immigrated into the Muschelkalk Basin through an eastern seaway (possibly the Silesian-Moravian Gate) during early Anisian time.

Abstract also in German.

Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-).

Subjects

Placodus

Call Number

QE1 .F4 n.s., no.31

Language

English

Identifiers

DOI: https://doi.org/10.5962/bhl.title.3301
OCLC: 34136981
Wikidata: https://www.wikidata.org/entity/Q51482810