Caption: Larva stage (planula) of a box jellyfish (Carybdea alata). This box jellyfish belongs to the Cubozoa group of Cnidarians. The larval stage of Cnidarians is called the planula and it is a free swimming developmental stage. Cubozoan planulae are pear-shaped, have pigment spots that may be sensitive to light, and swim for a few days using cilia. After a planula settles, it grows into a polyp. The cubozoan polyp can crawl around and bud off more polyps. Like all cnidarians, cubozoans possess nematocysts, cells that fire a barb and transfer venom. When a nematocyst contacts something that might be prey or predator, the barb uncoils and fires from the capsule along with toxic venom.
Magnification*: x200
Type: SEM
Copyright 2006 Dennis Kunkel Microscopy, Inc.
Keywords: 07.01.06,box jellyfish,cnidarian,coelenterate,invertebrate,invertebrates,jelly\r\nfish,jelly fish,larvae,marine,misc. invertebrates,plankton,planulae,polyp,salt water,saltwater,sea water,seawater,SEM,zooplankton,Carybdea alata,24355F