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Phallodrilus hallae, a new tubificid oligochaete from the St. Lawrence Great Lakes

Canadian Journal of Zoology

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Abstract

The predominantly marine tubificid genus Phallodrilus is defined, a key to its nine species constructed, and an illustrated description of Phallodrilus hallae n. sp. from the St. Lawrence Great Lakes presented. The species is distinguished from other members of the genus by its well-developed atrial musculature, extensions of which ensheath the posterior prostatic ducts. Phallodrilus hallae n. sp. is a small worm which is widely distributed in the sublittoral and profundal benthos of Lake Superior; lakewide it occurred in mean densities of 50 individuals per square metre. Available records indicate a more restricted distribution in Lake Huron and Georgian Bay. We suggest that P. hallae n. sp. is either a glaciomarine relict species, or that it entered the Great Lakes system at the time of the marine transgression of the St. Lawrence valley. The apparent restriction of P. hallae n. sp. to waters of high quality suggests that it may be a sensitive oligotrophic indicator species.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Phallodrilus hallae, a new tubificid oligochaete from the St. Lawrence Great Lakes
Series title:
Canadian Journal of Zoology
Volume
53
Issue:
7
Year Published:
1975
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 934-941
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Zoology
First page:
934
Last page:
941