Order - Trachymedusae

(Deep Sea Jellies)

Trachymedusae are identifiable by their umbrella edge which lacks any lobes. The edge of the umbrellas have either both solid as well as hollow tentacles or they only have solid tentacles, there is a thickened tissue ring that has a large number of nematocyst, the radial canals number from 4 to 6 to 8 and more than 8, though 8 is the most common amount found. The sensory clubs can be open or closed with the endodermal axis. The gonads are generally located at the radial canal or where the radial canal and the manubrium connect. The cnidome may have stenoteles. Trachymedusae reproduce sexually during the medusae stage lacking a polyp stage.

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