Leptomedusans

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Leptomedusans

 

the free-swimming medusae, or jellyfish, of coelenterates of the order Leptolida. They are small or medium in size; the diameter of the bell of the large medusa Aequorea reaches 40 cm. There are usually four radial canals in the gastrovascular system. The tentacles are located along the edge of the transparent bell. The canals, tentacles, and sexual glands are sometimes brightly colored. The eggs and sperm are shed into the water, where the eggs and larvae develop. The larvae, or planulae, settle on the substrate and form a polyp colony. Leptomedusans feed on plankton.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.