Euphysilla Kramp, 1955

Schuchert, Peter & Collins, Richard, 2021, Hydromedusae observed during night dives in the Gulf Stream, Revue suisse de Zoologie 128 (2), pp. 237-356 : 263-265

Genus Euphysilla Kramp, 1955

Euphysilla Kramp, 1955b: 245 ;

type species Euphysilla pyramidata Kramp, 1955 by monotypy.

Diagnosis: Medusa with pear- to egg-shaped umbrella in life; with apical chamber; manubrium with quadratic base; mouth circular; four equally developed tentacles with adaxial or abaxial nematocyst clasps and a terminal nematocyst knob; no gastric peduncle; mature gonads circular, surrounding manubrium; no ocelli. Usually with groups of medusa buds in middle part of manubrium.

Remarks: The diagnosis of Euphysilla of Bouillon et al. (2006) was here slightly modified by adding “with apical chamber” (see below). Euphysilla pyramidata appears indistinguishable from the genus Sphaerocoryne except for the medusa budding and the absence of ocelli. It is here associated with the Sphaerocorynidae following Petersen (1990, as suborder Sphaerocorynida incerta sedis).