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C. Riley Nelson
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taxon links Phylogenetic position of group is uncertain[down<--]Plecoptera Interpreting the tree
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This tree diagram shows the relationships between several groups of organisms.

The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.

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You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.

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Tree from Sivec, Stark, & Uchida 1988, modified by C. R. Nelson to include all of Perlidae.
Containing group: Plecoptera


Perlidae consist of about 400 species which are widely distributed in the northern hemisphere with a few genera extending into the southern hemisphere in Africa and South America.


Zwick (1973) listed five synapomorphies for Perlidae as: 1, only 6 individual abdominal ganglia present; 2, in nymphs the paraglossae aare inflated and the mentum broadened; 3, muscle ppm 56 is shifted from pleura to postalar sclerite; 4, muscle ism 24 present; 5, metamerous structure of testes reduced.


Sivec, I., B. P. Stark, and S. Uchida. 1988. Synopsis of the world genera of Perlinae (Plecoptera: Perlidae). Scopolia 16: 1-66.

Stark, B. P. and A. R. Gaufin. 1976. The nearctic genera of Perlidae (Plecoptera). Misc. Publ. Entomol. Soc. Amer. 10: 1-80.

Zwick, P. 1973. Insecta: Plecoptera. Phylogenetisches System und Katalog. Das Tierreich 94. Walter de Gruyter and Co., Berlin. 465 pp.

Title Illustrations
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Scientific Name Anacroneuria
Location Costa Rica
Life Cycle Stage adult (top), nymph (bottom)
Copyright © 1996
About This Page
I thank Bill Stark for his help with this and many other pages in this series.

C. Riley Nelson
Brigham Young University, Provo, Utah, USA

All Rights Reserved.

Citing this page:

Nelson, C. Riley. 1996. Perlidae. Version 01 January 1996 (under construction). http://tolweb.org/Perlidae/13953/1996.01.01 in The Tree of Life Web Project, http://tolweb.org/

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This page is a Tree of Life Branch Page.

Each ToL branch page provides a synopsis of the characteristics of a group of organisms representing a branch of the Tree of Life. The major distinction between a branch and a leaf of the Tree of Life is that each branch can be further subdivided into descendent branches, that is, subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

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