NemouridaeC. Riley Nelson
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Nemouridae is one of the largest families of Plecoptera with approximately 400 species divided between the nearctic, palearctic, and oriental regions (Baumann 1975). The nymphs are very distinctive in being broad, usually bristly, and having divergent wing pads. They occur in wide variety of streams but are probably most diverse in smaller creeks and spring runs.
Zwick (1973) listed four synapomorphies for the Nemouridae: 1, with testes large, long, and radiating from the anterior bend of the vas deferens in the shape of a star; 2, abdominal ganglia reduced to five; 3, last segment of the labial palpi large, round, and flattened; 3, the shape and site of insertion of the coxae. Baumann (1975) listed the synapomorphies for Amphinemurinae: 1, three lobed paraprocts; 2, paraprocts armed with spines or prongs. He listed the synapomorphy of the Nemourinae as having a ventral sclerite of the epiproct enlarged and with a very broad base.
Baumann, R. W. 1975. Revision of the stonefly family Nemouridae (Plecoptera) a study of the world fauna at the generic level. Smithsonian Contrib. Zool. 211: 1-74.
Nelson, C. H. 1984. Numerical cladistic analysis of phylogenetic relationships in Plecoptera. Ann. Entomol. Soc. Amer. 77: 466-473.
Zwick, P. 1973. Insecta: Plecoptera. Phylogenetisches System und Katalog. Das Tierreich 94. Walter de Gruyter and Co., Berlin. 465 pp.
C. Riley Nelson
Brigham Young University, Provo, Utah, USA
Page copyright © 1996
All Rights Reserved.
Citing this page:
Nelson, C. Riley. 1996. Nemouridae. Version 01 January 1996 (under construction). http://tolweb.org/Nemouridae/13941/1996.01.01 in The Tree of Life Web Project, http://tolweb.org/