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Origins and relationships of colonial Heliophyllum in the upper Middle Devonian (Givetian) of New York

Boletin - Real Sociedad Espanola de Historia Natural: Seccion Geologica

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Abstract

Heliophyllum halli Milne-Edwards and Haime is common to abundant in many Lower and Middle Devonian stratigraphic units in New York. Most Heliophyllum are solitary, but both branching and massive colonies are known. Four 'populations' of colonial Heliophyllum in the Givetian part of the sequence are distinct, as is a fifth form that occurs through the section. Each of the colonial forms is interpreted as an independent derivative of solitary forms of H. halli. The relationships appear to range from infrasubspecific to specific, and it is suggested that the complex should be recognized as the Heliophyllum halli species group.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Origins and relationships of colonial Heliophyllum in the upper Middle Devonian (Givetian) of New York
Series title:
Boletin - Real Sociedad Espanola de Historia Natural: Seccion Geologica
Volume
91
Issue:
1-4
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Boletin - Real Sociedad Espanola de Historia Natural: Seccion Geologica
First page:
53
Last page:
60