Temporary Page


Containing group: Actinostolidae


Actinostolidae with well developed, enlarged pedal disc. Column smooth, in the contracted state low, sometimes with more or less distinct longitudinal ridges in its upper part, which is capable of involution. Margin tentaculate, not lobed. Sphincter weak or well developed, mesogloeal. Tentacles short, the inner considerably stronger than the outer, without stinging-batteries at their bases. Longitudinal muscles of tentacles and radial muscles of oral disc mesogloeal. 2 deep siphonoglyphs. Mesenteries hexamerously arranged but not always regularly, at least the first 2 cycles perfect. Mesenteries of the third and fourth cycles, sometimes also some of the fifth, fertile. The weakest mesenteries only present in the most proximal part of the body, without filaments or gonads. Retractors weak, forming no distinct pennons. Parietobasilar muscles more or less strong. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors (and microbasic b-mastigophors?).


Carlgren, O. 1949. A Survey of the Ptychodactiaria, Corallimorpharia and Actiniaria. Kungl. Svenska Vetenskapsakadamiens Handlingar, series 4, volume 1, number 1.

About This Page
The information provided on this page is based on Oscar Carlgren's 1949 catalog.
Copyright © 1949 Swedish Academy of Sciences.

Please note that Carlgren's text contains a number of errors, and much of the information is now out of date. An update of the catalog is currently under preparation in Daphne Fautin's laboratory, and the results of this work will be incorporated in future versions of this page.

Keyboarding of Carlgren's catalog was done as part of a project to create an electronic database of the sea anemones of the world, funded by NSF Grant DEB9521819, awarded to Daphne G. Fautin. This grant is in the program Partnerships to Enhance Expertise in Taxonomy (PEET). Susanne Hauswaldt, Katherine Pearson, and April Wakefield-Pagels contributed to the keyboarding effort.

Correspondence regarding this page should be directed to Daphne G. Fautin at

All Rights Reserved.

Citing this page:

Tree of Life Web Project. 2000. Pycnanthus. Version 01 January 2000 (temporary). http://tolweb.org/Pycnanthus/18833/2000.01.01 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