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Late Triassic thalamid sponges from Nevada

Published online by Cambridge University Press:  14 July 2015

Baba Senowbari-Daryan  and
George D. Stanley Jr.
Baba Senowbari-Daryan
Affiliation:
Institute of Paleontology, University of Erlangen, D-8520 Erlangen, Germany
George D. Stanley Jr.
Affiliation:
Department of Geology, University of Montana, Missoula 59812
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Abstract

A study of Upper Triassic (Norian) thalamid sponges (“sphinctozoans”) from the Pilot Mountains, Garfield Hills, and East Range, Nevada, reveals an abundance of calcified sponges of the suborder Porata Seilacher. Two new species, Polycystocoelia silberlingi n. sp. and Neoguadalupia? norica n. sp., are added to our knowledge of five thalamid sponge taxa previously known from Nevada. All specimens have been neomorphically altered to calcite in a manner implying an original aragonite mineralogy.

At the species level, the sponges show a restricted distribution. Nevadathalamia cylindrica (Seilacher) is a species also occurring in Sonora, Mexico, and previously known from the Yukon of Canada, but all other species are endemic to west-central and northwestern Nevada. At the generic level, similarities exist with species known from the Tethyan Realm, the Yukon, and south China. The genus Polycystocoelia has been known previously only from Hubei, China, and from the Yukon Territory, Canada. Neoguadalupia was previously known only from the Lower and Upper Permian of China. The occurrence of this genus in Nevada constitutes the first record of the genus outside of the Permian System of China.

Type
Research Article
Information
Journal of Paleontology , Volume 66 , Issue 2 , March 1992 , pp. 183 - 193
Copyright
Copyright © The Paleontological Society 

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