Morphological variation with interspecific implications in a population of Sigara dorsalis (Leach) (Hemiptera Heteroptera: Corixidae), and a request for British specimens

Savage, Alan A. (1991) Morphological variation with interspecific implications in a population of Sigara dorsalis (Leach) (Hemiptera Heteroptera: Corixidae), and a request for British specimens. Freshwater Forum, 1(1), pp. 73-77.

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Abstract

Sigara dorsalis belongs to a very closely related group of six species forming the sub-genus Sigara sensu strictu. Each of the six species has a distinct allopatric geographical distribution in Europe. Studies were started on a series of populations in the north west Midlands of England. All the populations examined, except one, contained only males with the typical diagnostic features of S. dorsalis, albeit with considerable variation. One pond near Congleton, Cheshire situated in a permanent-ley pasture and apparently free from pollution contained typical S. dorsalis males but, in addition, many atypical individuals. From one sample of forty-six males, all possessed left parameres with the slight point on the dorsal surface characteristic of S. dorsalis. However, almost half possessed additional morphological features intermediate between S. dorsalis and S. striata.

Item Type: Article
Title: Morphological variation with interspecific implications in a population of Sigara dorsalis (Leach) (Hemiptera Heteroptera: Corixidae), and a request for British specimens
Personal Creator/Author:
CreatorsEmail
Savage, Alan A.
Journal or Publication Title: Freshwater Forum
Volume: 1
Number: 1
Page Range: pp. 73-77
Date: 1991
Contact Email Address: library@fba.org.uk
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: animal morphology; hybrids; phenotypic variations; taxonomy
Subjects: Ecology
Item ID: 4521
Depositing User: Hardy B Schwamm
Date Deposited: 29 Oct 2010 12:10
Last Modified: 29 Sep 2011 16:18
URI: http://aquaticcommons.org/id/eprint/4521

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