Temporary Page


Please note: Entries in the above species list are the original binomina of species according to Carlgren's 1949 catalog. Nomenclatorial inconsistencies need to be resolved in a future revision of this genus (see below).
Containing group: Actinostolidae


Actinostolidae with the body, especially in larger individuals, cup-shaped, broad in the upper part, and here more or less distinctly lobate. Column thick, smooth, or with weaker or stronger flattened tubercles. Margin indistinct. Sphincter mesogloeal, very weak in comparison with the size of the body, so that the tentacle cannot be wholly covered by the upper part of the body. Tentacles short, especially the outer ones, hexamerously arranged, in the contracted state irregularly rugose, with or without thickenings of the mesogloea at the base on the aboral side. Large microbasic b-mastigophors in the distal part of the tentacles. Longitudinal muscles of tentacles and radial muscles of oral disc mesogloeal. 2 broad siphonoglyphs. Mesenteries at the base fewer than those at the margin. 2 pairs of directives. The two mesenteries of one and the same pair, in the youngest cycles, are developed in such a way that the mesentery which has its retractor facing towards the nearest mesenterial pair of the preceding cycle is larger than its partner. Retractors diffuse, parietobasilar and basilar muscles strong. Mesenteries of the two first cycles sterile. The fertile mesenteries have filaments. Cnidom: spirocysts, basitrichs, microbasic b- and p-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Please note that Carlgren's text contains a number of errors, and much of the information is now out of date.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. Paractinostola. Version 01 January 2000 (temporary). http://tolweb.org/Paractinostola/18816/2000.01.01 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