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C. Riley Nelson
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taxon links [down<--]Taeniopterygidae 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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Tree from Stanger & Baumann 1993.
Containing group: Taeniopterygidae


Thirteen species of Taenionema are currently recognized (Stanger & Baumann 1993). Most are found in western North America with a single species in eastern North America and another single species found in Japan and eastern Asia.


Stanger and Baumann (1993) used the suggestions of Ricker and Ross (1975) to list the synapomorphies of the genus as: 1. The epiproct is narrow with the tip bent back or otherwise modified. The tip is sharply pointed from a lateral aspect and slightly scooped out behind. 2. The basicercal processes are rounded, elongate, either fleshy or narrow, and are directed mostly dorsaly with the tip narrowed and curved back. 3. The posterolateral corners of sternum 9 in the male are slightly to moderately elevated, with the middle region of the hind margin of the sternum depressed. Stanger and Baumann (1993) produced the matrix for the species in the genus along with the tree that is used on this page.


Ricker, W. E. and H. H. Ross. 1975. Synopsis of the Brachypterinae (Insecta: Plecoptera: Taeniopterygidae). Canad. J. Zool. 53: 132-153.

Stanger, J. A. and R. W. Baumann. 1993. A revision of the stonefly genus Taenionema (Plecoptera: Taeniopterygidae). Trans. Amer. Entomol. Soc. 119: 171-229.

Title Illustrations
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Scientific Name Taenionema pallidum
Location New Mexico
Specimen Condition Live Specimen
Copyright © 1996
About This Page

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

All Rights Reserved.

Citing this page:

Nelson, C. Riley. 1996. Taenionema. Version 01 January 1996 (under construction). http://tolweb.org/Taenionema/14392/1996.01.01 in The Tree of Life Web Project, http://tolweb.org/

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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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