Publication Date

1973

Document Type

Dissertation/Thesis

First Advisor

Greenfield, David W.

Degree Name

M.S. (Master of Science)

Department

Department of Biological Sciences

LCSH

Gerreidae

Abstract

The genera Diapterus and Eugerres, family Gerreidae, are examined taxonomically to the conclusion that both are valid taxa. A total of 14 species had currently been recognized, of which four have been referred to synonymy and two to resurrected names (peruvianus = brevirostris, olisthostomus = auratus). Three species are attributed to Diapterus and six to Eugerres based on pharyngeal arch morphology, differential occurrence of lachrymal serrations and lateral stripes, and strength of dorsal and anal-fin spines. A new genus, Schizopterus, is described for Diapterus aureolus (Jordan and Gilbert) in accordance with its uniqueness from Diapterus and Eugerres in possessing separate dorsal fins, high gently curved lateral line, weak fin spines, and oval lateral outline of body. Diapterus and Eugerres are represented in the eastern Pacific and western Atlantic regions, commonly entering brackish and occasionally fresh waters. Schizopterus occurs only in the eastern Pacific and is apparently strictly marine.

Comments

Includes bibliographical references.||Includes illustrations.

Extent

vii, 74 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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