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Genus Hormosoma Stephenson, 1918

 

Distribution

Other Regions

Australian Antarctic Territory

Diagnosis

Actinostolidae with well developed pedal disc. Column smooth, thick, with a submarginal collar. Sphincter strong, mesogloeal. Tentacles short, but thick, arranged in several cycles, the inner longer than the outer. Outermost cycle of tentacles on their aboral sides at the base provided with a more or less distinct battery of microbasic b-mastigophores. Longitudinal muscles of tentacles and radial muscles of oral disc mesogloeal. Oral disc wide. 2 very broad siphonoglyphs, aborally prolonged. Tentacles and mesenteries hexamerously arranged. 2 pairs of directives. About same number of tentacles and mesenteries. Perfect pairs of mesenteries fairly numerous. Retractors with coarse folds forming a small pennon close to the gonads. Parietobasilar muscles very broad, forming a deep fold, basilar muscles strong. All mesenteries, sometimes except the directives, fertile. Cnidom: spirocysts, basitrichs, microbasic b- and p-mastigophores.

 

History of changes

Note that this list may be incomplete for dates prior to September 2013.
Published As part of group Action Date Action Type Compiler(s)
05-Aug-2022 NYNANTHEAE Carlgren, 1899 13-Aug-2013 MOVED Dr Bronwen Scott
19-Feb-2011 ADDED