Temporary Page


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 Not MonophyleticNot MonophyleticNot MonophyleticPhylogenetic position of group is uncertain[down<--]Bilateria 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
Relationships after Hochberg & Litvaitis 2000.
Containing group: Bilateria

Other Names for Gastrotricha


Boaden, P. J. S. 1985. Why is a gastrotrich? Pages 248-260 in: The Origins and Relationships of Lower Invertebrates. S. Conway Morris, J. D. George, R. Gibson, and H. M. Platt (eds.). The Systematics Association and Clarendon Press, Oxford, England.

Hochberg, R. and M. K. Litvaitis. 2000. Phylogeny of gastrotricha: a morphology-based framework of gastrotrich relationships. Biological Bulletin 198:299-305.

Hochberg, R. and M. K. Litvaitis. 2001. Macrodasyida (Gastrotricha): a cladistic analysis of morphology. Invertebrate Biology 120:124-135.

Hochberg, R. and M. K. Litvaitis. 2001. The muscular system of Dactylopodola baltica and other macrodasyidan gastrotrichs in a functional and phylogenetic perspective. Zoologica Scripta 30:325-336.

Kieneke, A., W. H. Ahlrichs, and P. Martínez Arbizu. 2009. Morphology and function of reproductive organs in Neodasys chaetonotoideus (Gastrotricha: Neodasys) with a phylogenetic assessment of the reproductive system in Gastrotricha. Zoologica Scripta 38(3):289-311.

Manylov, O. G., N. S. Vladychenskaya, I. A. Milyutina, O. S. Kedrova, N. P. Korokhov, G. A. Dvoryanchikov, V. V. Aleshin, and N. B. Petrov. 2004. Analysis of 18S rRNA gene sequences suggests significant molecular differences between Macrodasyida and Chaetonotida (Gastrotricha). Molecular Phylogenetics and Evolution 30(3):850-854.

Ruppert, E. E. 1991. Gastrotricha. Pages 41-109 in Microscopic Anatomy of Invertebrates, Vol. 4. Ashelminthes. F. W. Harrison and E. E. Ruppert, eds. Wiley-Liss, New York.

Todaro, M. A., D. T. J. Littlewood, M. Balsamo, E. A. Herniou, S. Cassanelli, G. Manicardi, A. Wirz, and P. Tongiorgi. 2003. The interrelationships of the Gastrotricha using nuclear small rRNA subunit sequence data, with an interpretation based on morphology. Zoologischer Anzeiger 242(2):145-156.

Wirz, A., S. Pucciarelli, C. Miceli, P. Tongiorgi, and M. Balsamo. 1999. Novelty in phylogeny of Gastrotricha: Evidence from 18S rRNA gene. Molecular Phylogenetics and Evolution 13:314-318.

Zrzavy, J. 2003. Gastrotricha and metazoan phylogeny. Zoologica Scripta 32(1):61-81.

Information on the Internet

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 Gastrotricha
Creator Ivy Livingstone
Body Part major external features
Copyright © 1995 BIODIDAC
Scientific Name Gastrotricha
Source gastrotrich
Source Collection Flickr
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs License - Version 2.0.
Copyright © 2007 Jasper Nance
About This Page

All Rights Reserved.

Citing this page:

Tree of Life Web Project. 1995. Gastrotricha. Version 01 January 1995 (temporary). http://tolweb.org/Gastrotricha/2479/1995.01.01 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