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Noturus insignis (Richardson 1836)

Margined Madtom

Larry Page
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Containing group: Noturus

Identification

The body of the Margined Madtom is yellow to slate gray above and white or light below. The fins are yellow or light gray and the median fins, except for the adipose fin, have a black edge. Fin borders are blackest in clear streams and may be only dusky in color in turbid water. Individuals in the Dan River, Virginia, have dark spots on the body and fins. The upper jaw projects beyond the lower jaw. The rear edge of the pectoral spine has large teeth. The caudal fin edge is straight or slightly rounded. The anal fin has 15-21 rays. To 6 in. (15 cm) total length.

Range

The Margined Madtom is found on the Atlantic Slope from the St. Lawrence River and Great Lakes drainages, southern Quebec and Ontario, to the upper Altamaha River drainage in Georgia. It also is found in the upper Kanawha (New) River system in Virginia and North Carolina, and the upper Monongahela River system in Pennsylvania and Maryland. The Margined Madtom has been introduced into the Merrimack River, New Hampshire, and the upper Tennessee River drainage in Virginia and Tennessee. This species is common in the U.S., but is protected in Canada as a threatened species.

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Distribution of Noturus insignis. © Larry Page

Habitat

The Margined Madtom inhabits rocky riffles and runs of clear, fast creeks and small to medium rivers.

Similar Species

The Slender Madtom, Noturus exilis, is the only other madtom to have black borders on its fins, but differs from the Margined Madtom in that the jaws are equal (upper jaw does not project beyond lower jaw), and there is a large light yellow spot on the nape and a smaller one on the rear of the dorsal fin base.

Other Names for Noturus insignis (Richardson 1836)

Title Illustrations
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Scientific Name Noturus insignis
Location Roanoke R., Roanoke Co., VA
Specimen Condition Dead Specimen
Identified By L. M. Page
Life Cycle Stage Adult
Size 108 mm SL
Copyright © Larry Page
About This Page

Larry Page
Florida Museum of Natural History, Gainesville, Florida, USA

Correspondence regarding this page should be directed to Larry Page at and Griffin Sheehy at

All Rights Reserved.

Citing this page:

Page, Larry. 2007. Noturus insignis (Richardson 1836). Margined Madtom. Version 23 May 2007 (under construction). http://tolweb.org/Noturus_insignis/69896/2007.05.23 in The Tree of Life Web Project, http://tolweb.org/

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