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Protocercal :: Protocercal (a.) Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal..

Pseudoscorpiones :: Pseudoscorpiones (n. pl.) An order of Arachnoidea having the palpi terminated by large claws, as in the scorpions, but destitute of a caudal sting; the false scorpions. Called also Pseudoscorpii, and Pseudoscorpionina. See Illust. of Book scorpion, under Book..

Priapulacea :: Priapulacea (n. pl.) A suborder of Gephyraea, having a cylindrical body with a terminal anal opening, and usually with one or two caudal gills..

Posterior :: Posterior (a.) At or toward the caudal extremity; caudal; -- in human anatomy often used for dorsal.

Urosacral :: Urosacral (a.) Of or pertaining to both the caudal and sacral parts of the vertebral column; as, the urosacral vertebrae of birds..

Scyllaea :: Scyllaea (n.) A genus of oceanic nudibranchiate mollusks having the small branched gills situated on the upper side of four fleshy lateral lobes, and on the median caudal crest..

Postaxial :: Postaxial (a.) Situated behind any transverse axis in the body of an animal; caudal; posterior; especially, behind, or on the caudal or posterior (that is, ulnar or fibular) side of, the axis of a vertebrate limb..

Bicaudate :: Bicaudate (a.) Two-tailed; bicaudal.

Pygidium :: Pygidium (n.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of Limulus and Trilobite..

Skate :: Skate (n.) Any one of numerous species of large, flat 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..

Hypural :: Hypural (a.) Under the tail; -- applied to the bones which support the caudal fin rays in most fishes.

Hawk Moth :: Hawk moth () Any moth of the family Sphingidae, of which there are numerous genera and species. They are large, handsome moths, which fly mostly at twilight and hover about flowers like a humming bird, sucking the honey by means of a long, slender proboscis. The larvae are large, hairless caterpillars ornamented with green and other bright colors, and often with a caudal spine. See Sphinx, also Tobacco worm, and Tomato worm..

Elater :: Elater (n.) The caudal spring used by Podura and related insects for leaping. See Collembola.

Sagitta :: Sagitta (n.) 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 Chaetognatha..

Fulcrum :: Fulcrum (n.) One of the small, spiniform scales found on the front edge of the dorsal and caudal fins of many ganoid fishes..

Thysanura :: Thysanura (n. pl.) 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..

Styliferous :: Stylet (n.) Any small, more or less rigid, bristlelike organ; as, the caudal stylets of certain insects; the ventral stylets of certain Infusoria..

Springtide :: Springtail (n.) Any one of numerous 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..

Uro- :: Uro- () A combining form from Gr. o'yra`, the tail, the caudal extremity..

Pygostyle :: Pygostyle (n.) The plate of bone which forms the posterior end of the vertebral column in most birds; the plowshare bone; the vomer. It is formed by the union of a number of the last caudal vertebrae, and supports the uropigium..

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