Oh my goodness! Unless you are a Tree of Life developer, you really shouldn't be here. This page is part of our beta test site, where we develop new features for the ToL, often messing up a thing or two in the process. Please visit the official version of this page, which is available here.
Under Construction


C. Riley Nelson
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
taxon links [down<--]Plecoptera Interpreting the tree
close box

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.

example of a tree diagram

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.

For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.

close box
Tree modified from Surdick (1985).
Containing group: Plecoptera


Chloroperlidae consists of approximately 110 species divided between the nearctic, palearctic, and oriental regions. The nymphs are distinctive in having quite short legs and shortened cerci. Some genera are a common part of the general benthos in streams and rivers while others, especially the Paraperlinae, are exclusively hyporheic.


Zwick (1973) lists two synapomorphies of the Chloroperlidae as: 1, last palpal segment minute, conical, inserted asymmetrically on second to las segment; 2, caecal sacs of gut reduced. He lists the synapomorphy for the Paraperlinae as having the head elongate, with the temples parallel. He lists three synapomorphies for the Chloroperlinae: 1, tearing mandible of nymph secondarily present in adult; 2, distal portion of male epiproct no longer directed posteriorly but sharply bent to point forwar: basal rod flat and wide, largely fused to front margin of 10th segment; 3, anal fan of wing much reduced. Surdick (1985) presents phylogenetic information for the nearctic genera.


Nelson, C. H. 1984. Numerical cladistic analysis of phylogenetic relationships in Plecoptera. Ann. Entomol. Soc. Amer. 77: 466-473.

Surdick, R. F. 1985. Nearctic genera of Chloroperlinae (Plecoptera: Chloroperlidae). Illinois Biol. Monog. 54: 1-146.

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

Title Illustrations
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
Scientific Name Sweltsa hondo, Sweltsa coloradensis
Location New Mexico (Sweltsa hondo), Arizona (Sweltsa coloradensis)
Specimen Condition Live Specimen
Life Cycle Stage adult (Sweltsa hondo), nymph (Sweltsa coloradensis)
Copyright © 1996
About This Page

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

All Rights Reserved.

Citing this page:

Nelson, C. Riley. 1996. Chloroperlidae. Version 01 January 1996 (under construction). http://tolweb.org/Chloroperlidae/13954/1996.01.01 in The Tree of Life Web Project, http://tolweb.org/

edit this page
close box

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.

close box


Page Content

articles & notes



Explore Other Groups

random page

  go to the Tree of Life home page