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Isactinernus 4-lobatus Carlgren 1918

Containing group: Actinernidae


Actinernidae with well-developed pedal disc. Column with very small mesogloeal papillae, the ectoderm of which forms small nematocyst batteries, cylindrical, in the distal part drawn out into 4 triangular lobes which are able to cover the oral disc and the mouth. No sphincter. Tentacles very short, conical, numerous in at least 2 cycles, largest at the apices of the lobes, the inner with narrow aboral mesogloeal thickenings at the base, the outer with slighter or no thickenings. Longitudinal muscles of tentacles ectodermal, radial muscles of oral disc very strong, chiefly ectodermal. 2 siphonoglyphs. Mesogloea of actinopharynx very thick. Numerous perfect mesenteries arranged in cycles, the partners equally developed. Weak retractors in lower parts of older mesenteries, parietobasilar muscles weak. Dioecious. Cnidom: see the suborder.

Other Names for Isactinernus 4-lobatus Carlgren 1918


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Please note that Carlgren's text contains a number of errors, and much of the information is now out of date.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. Isactinernus. Isactinernus 4-lobatus Carlgren 1918. Version 01 January 2000 (temporary). http://tolweb.org/Isactinernus_4-lobatus/17676/2000.01.01 in The Tree of Life Web Project, http://tolweb.org/

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