Under Construction

Chelomophrynus bayigroup is extinct

Containing group: Rhinophrynidae


This extinct species is known from the Middle Eocene, about 40-45 ma (Wagon Bed Formation, Uintan, Hot Springs County, Wyoming). What is unusual is that all of the bones are concentrated in a small area. This site of deposition is sandstone, and is interpreted as the shoreline of a calcium carbonate-rich lake in which the water was warm and shallow. The sample contained about 600 bones representing at least 19 individual frogs. The individual frogs seem to be young adults. Catastrophic death is thought to be the cause of mortality.


Henrici, A. C. 1991. Chelomophrynus bayi (Amphibia, Anura, Rhinophrynidae), a new genus and species from the Middle Eocene of Wyoming: Ontogeny and relationships. Ann. Carnegie Mus. 60(2):97-144.

About This Page

Page: Tree of Life Chelomophrynus bayi. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Tree of Life Web Project. 2008. Chelomophrynus bayi. Version 29 November 2008 (under construction). http://tolweb.org/Chelomophrynus_bayi/17526/2008.11.29 in The Tree of Life Web Project, http://tolweb.org/

edit this page
close box

This page is a Tree of Life Leaf Page.

Each ToL leaf page provides a synopsis of the characteristics of a group of organisms representing a leaf at the tip of the Tree of Life. The major distinction between a leaf and a branch of the Tree of Life is that a leaf cannot generally be further subdivided into 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

Chelomophrynus bayi

Page Content

articles & notes



Explore Other Groups

random page

  go to the Tree of Life home page