Comb Jelly

Ctenophora, commonly known as comb jellies, is a basal phylum of marine invertebrate animals notable for swimming with groups of cilia called combs, found in marine habitats worldwide with 186 recognised living species. They are the largest animals to swim using cilia, ranging from a few millimetres to as much as 1.5 metres, with a body of jelly-like mesoglea between two cell-thick layers, and body forms that include the egg-shaped cydippids with retractable tentacles, the flat combless platyctenids, and the large-mouthed beroids that prey on other ctenophores. Almost all are predators, and although their soft bodies rarely fossilise, possible ctenophore fossils appear in well-preserved beds dating back to the early Cambrian, about 525 million years ago.