An edition of North American cyclocrinitid algae (1970)

North American cyclocrinitid algae

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Last edited by Open Library Bot
December 5, 2010 | History
An edition of North American cyclocrinitid algae (1970)

North American cyclocrinitid algae

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Cyclocrinitids are marine dasycladaceous algae of Ordovician and Silurian age. Their skeletal elements consist of a seldom calcified main axis on which lateral branches are borne in whorls. Calcified heads commonly form at the termini of the laterals. In North America cyclocrinitids are represented by three genera: Anomaloides, Cyclocrinites, and Lepidolites. Anomaloides (=Anomalospongia) possesses laterals calcified throughout their extent. They expand gently outward, and no heads form. Three secondary laterals form threadlike projections at the terminus of each lateral. -- Cyclocrinites (=Cyclocrinus, Lunulites, Cerionites, Pasceolus, Mastopora, and Nidulites) with a globose thallus is the most diversified genus. The laterals expand at the termini and form generally six-sided heads. In one species the laterals branch to the second degree. The lateral heads are in some species supported by four to six ribs. In at least one species the laterals constrict twice and form two layers of heads, one above the other. The main axis is generally short, and attachment is by means of a pedicle that is, however, frequently not preserved. Calcification generally occurs above and below the lateral heads. One new species, Cyclocrinites welleri, is described. -- Lepidolites consists of one species only and is the most modified of all cyclocrinitids. The laterals are short, small, and calcified; their ends are modified and form overlapping plates. -- The cyclocrinitids have been variously assigned by many authors to many groups, particularly as an appendix to the sponges. They are here considered a basal receptaculitid stock that possesses the simplest structures. They fill an important gap in the fossil record of Paleozoic algae.

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Cover of: North American cyclocrinitid algae
North American cyclocrinitid algae
1970, Field Museum of Natural History
in English
Cover of: North American cyclocrinitid algae
North American cyclocrinitid algae
1970, Field Museum of Natural History

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Book Details


Table of Contents

Pt. I: Introduction
Previous major publications
Morphology
Taxonomic position
Ecology
Pt. II: Systematic descriptions
Pt. III: Original definitions and descriptions of other authors.
Annotated bibliography.

Edition Notes

Published in
[Chicago]
Series
Fieldiana -- v. 21, [Field Museum of Natural History, Chicago] Publication -- 1110, Publication (Field Museum of Natural History) -- 1110.
Other Titles
Cyclocrinitid algae

Classifications

Dewey Decimal Class
550/.8 s
Library of Congress
QE1 .F4 vol. 21

The Physical Object

Pagination
p. vii-[xiv], 182 p.

ID Numbers

Open Library
OL7060862M
Internet Archive
northamericancyc21nite
LCCN
71135119
OCLC/WorldCat
124459

Source records

Internet Archive item record

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December 5, 2010 Edited by Open Library Bot Added subjects from MARC records.
April 28, 2010 Edited by Open Library Bot Linked existing covers to the work.
October 15, 2009 Created by WorkBot add works page