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A genus of transparent, free-swimming marine worms having lateral and caudal fins, and capable of swimming rapidly. It is the type of the class Chætognatha.

chnids of the order scorpiones, having a suctorial mouth, large claw-bearing palpi, and a caudal sting.

branched gills situated on the upper side of four fleshy lateral lobes, and on the median caudal crest.

elasmobranch fishes of the genus Raia, having a long, slender tail, terminated by a small caudal fin. The pectoral fins, which are large and broad and united to the sides of the body and head, give a somewhat rhombic form to these fishes. The skin is more or less spinose.

species of small apterous insects belonging to the order Thysanura. They have two elastic caudal stylets which can be bent under the abdomen and then suddenly extended like a spring, thus enabling them to leap to a considerable distance. See Collembola, and Podura.

Any one of numerous species of ten-armed cephalopods having a long, tapered body, and a caudal fin on each side; especially, any species of Loligo, Ommastrephes, and related genera. See Calamary, Decacerata, Dibranchiata.

ly when connected with a poison gland, and adapted to inflict a wound by piercing; as the caudal sting of a scorpion. The sting of a bee or wasp is a modified ovipositor. The caudal sting, or spine, of a sting ray is a modified dorsal fin ray. The term is sometimes applied to the fang of a serpent. See Illust. of Scorp…

Any small, more or less rigid, bristlelike organ; as, the caudal stylets of certain insects; the ventral stylets of certain Infusoria.

An order of wingless hexapod insects which have setiform caudal appendages, either bent beneath the body to form a spring, or projecting as bristles. It comprises the Cinura, or bristletails, and the Collembola, or springtails. Called also Thysanoura. See Lepisma, and Podura.

d protect themselves beneath a mass of dried excrement held over the back by means of the caudal spines. The golden tortoise beetle (Cassida aurichalcea) is found on the morning-glory vine and allied plants. -- Tortoise plant. (Bot.) See Elephant's foot, under Elephant. -- Tortoise shell, the substance of the shell o…

A combining form from Gr. o'yra`, the tail, the caudal extremity.

Of or pertaining to both the caudal and sacral parts of the vertebral column; as, the urosacral vertebræ of birds.