The bell of adult Tripedalia cystophora is usually no more than 1-2 cm in height; it has three blade-like pedalia at each interradius
and a single tentacle extending from each pedalium.
This would be possible if each rhopalial pacemaker ganglion could regulate the contractions of each occupied perradius and interradius
swimming muscle separately, in response to the inputs from the IR source.
Females lay eggs on the substratum through oral gonopores, two per interradius
The animals ranged in size from 30 to 40 mm from the tip of the longest arm to the opposite interradius