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A new noncalcified dasycladalean alga from the Silurian of Wisconsin

Published online by Cambridge University Press:  20 May 2016

STEVEN T. LoDuca ,
Joanne Kluessendorf  and
Donald G. Mikulic
STEVEN T. LoDuca
Affiliation:
1Department of Geography and Geology, Eastern Michigan University, Ypsilanti 48197,
Joanne Kluessendorf
Affiliation:
2Weis Earth Science Museum, University of Wisconsin-Fox Valley, Menasha 54952
Donald G. Mikulic
Affiliation:
3Illinois State Geological Survey, Champaign 61820
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Abstract

Noncalcified thalli, consisting of a narrow main axis with numerous branched hairlike laterals in whorls and a subapical array of undivided clavate laterals, from the Silurian (Llandovery) Brandon Bridge Formation of southeastern Wisconsin, constitute the basis for a new genus and species of dasycladalean alga, Heterocladus waukeshaensis. A relationship within the family Triploporellaceae is indicated by the whorled arrangement of the laterals and the absence of gametophores on mature specimens. A compilation of occurrence data suggests that noncalcified dasyclads, as a whole, were more abundant and diverse during the Ordovician and Silurian than at any other time in their history. The heterocladous thallus architecture of this alga adds to a wide range of morphological variation documented among Ordovician and Silurian dasyclads, the sum of which indicates that Dasycladales underwent a significant evolutionary radiation during the early Paleozoic.

Type
Research Article
Information
Journal of Paleontology , Volume 77 , Issue 6 , November 2003 , pp. 1152 - 1158
Copyright
Copyright © The Paleontological Society 

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