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Marginovatia, a mid-Carboniferous genus of linoproductid brachiopods

Published online by Cambridge University Press:  14 July 2015

Mackenzie Gordon Jr.
Affiliation:
1U. S. Geological Survey, Washington, D.C. 22065
Thomas W. Henry
Affiliation:
2U. S. Geological Survey, Denver, Colorado 80225

Abstract

Marginovatia is proposed as a new genus of small North American linoproductid brachiopods that developed a narrow shelf around the anterior and anterolateral margin of the visceral disc in the brachial valve and a corresponding small flange in the pedicle valve interior. When the valves closed, these structures fit together and helped seal off the visceral cavity. This genus first appeared in the Late Mississippian (late Meramecian), continued through the Early and earliest Middle Pennsylvanian (Morrowan), and may have continued into the early Middle Pennsylvanian (Atokan). In addition to the type species, Productus inflatus var. minor Snider, seven species are assigned to this genus: Marginovatia aureocollis n. sp., M. catinulus n. sp., Linoproductus duodenarius Easton, M. eurekensis n. sp., M. manardensis n. sp., Productus (Linoproductus) semicubiculus Bell, and L. pumilus Sutherland and Harlow. An eighth species, identified as Marginovatia aff. M. pumila (Sutherland and Harlow), occurs in rocks of probable middle to late Morrowan or Atokan age in southeastern Alaska.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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