锥石纲纲

下属分类

• 本纲包括以下目：
• Cambojiida
• Cambojiidae
• 带水母目 Cestida
• Cryptolobiferida
• Cryptolobatidae
• 球栉水母目 Cydippida
• 美光水母目 Ganeshida
• 兜水母目 Lobata
• 扁栉水母目 Platyctenida
• Coeloplanidae
• Coeloplana Kowalevsky, 1880
• Komaia Esaki, 1926
• Vallicula Rankin, 1956
• Vallicula multiformis Rankin, 1956
• Ctenoplanidae
• Lyroctenidae
• Savangiidae
• Tjalfiellidae
• 海萼水母目 Thalassocalycida
• 目的地位未定的科：
• Callianiridae

Tentaculata is a class of comb jellies, one of two classes in the phylum Ctenophora. The common feature of this class is a pair of long, feathery, contractile tentacles, which can be retracted into specialised ciliated sheaths. In some species, the primary tentacles are reduced and they have smaller, secondary tentacles. The tentacles have colloblasts, which are sticky-tipped cells that trap small prey.

Body size and shape varies widely. The group includes the small, oval sea gooseberries found on both Atlantic and Pacific coasts. The more flattened species of the genus Mnemiopsis, about 4 inches (10 cm) long, are common on the upper Atlantic coast; it has a large mouth and mainly feeds on larval molluscs and copepods. This species is brilliantly luminescent. The similar, but larger, genus Leucothea is abundant on the Pacific coast. The Venus girdle (genus Cestum) is a flattened, ribbon-like form reaching over 3 feet (91 cm) in length, and found in tropical waters.