Orchistoma Haeckel, 1879

Schuchert, Peter & Collins, Richard, 2021, Hydromedusae observed during night dives in the Gulf Stream, Revue suisse de Zoologie 128 (2), pp. 237-356 : 289

publication ID	https://doi.org/ 10.35929/RSZ.0049
DOI	https://doi.org/10.5281/zenodo.5640036
persistent identifier	https://treatment.plazi.org/id/D0118A7C-5B39-0021-FC7C-F99BFB967FDC
treatment provided by	Felipe
scientific name	Orchistoma Haeckel, 1879
status

Treatment

Genus Orchistoma Haeckel, 1879 View in CoL View at ENA

Orchistoma Haeckel, 1879: 138 View in CoL ;

type species Mesonema pileus Lesson, 1843 ( Kramp, 1961) .

Tetracannota Mayer, 1900: 46 View in CoL ; type species Tetracannota collapsum Mayer, 1900 View in CoL by monotypy.

Diagnosis: Medusa with short manubrium on large gastric peduncle; mouth with 8-30 sinuous or crenulated lips; eight or more radial canals, simple, ramified, or in groups of four. Up to 64 marginal tentacles; no marginal cirri, but with thin, filiform, tentaculiform structures devoid of marginal bulbs; gonads usually on proximal parts of radial canals; numerous adaxial ocelli; without statocysts, without cordyli, without excretory pores or papillae.

Hydroid phase unknown.