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Rhynchocephala :: Rhynchocephala (n. pl.) An order of reptiles having biconcave vertebrae, immovable quadrate bones, and many other peculiar osteological characters. Hatteria is the only living genus, but numerous fossil genera are known, some of which are among the earliest of reptiles. See Hatteria. Called also Rhynchocephalia..

Perivertebral :: Perivertebral (a.) Surrounding the vertebrae.

Protovertebrae :: Protovertebrae (pl. ) of Protovertebr.

Coccygeal :: Coccygeal (a.) Of or pertaining to the coccyx; as, the coccygeal vertebrae..

Suchwise :: Suchospondylous (a.) Having dorsal vertebrae with long and divided transverse processes; -- applied to certain reptiles.

Anapophysis :: Anapophysis (n.) An accessory process in many lumbar vertebrae.

Procoelian :: Procoelian (n.) A reptile having procoelian vertebrae; one of the Procoelia.

Amphioxus :: Amphioxus (n.) A fishlike creature (Amphioxus lanceolatus), two or three inches long, found in temperature seas; -- also called the lancelet. Its body is pointed at both ends. It is the lowest and most generalized of the vertebrates, having neither brain, skull, vertebrae, nor red blood. It forms the type of the group Acrania, Leptocardia, etc..

Ichthyosaurus :: Ichthyosaurus (n.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oolitic, and Cretaceous formations..

Archaeopteryx :: Archaeopteryx (n.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebrae with feathers along each side, and jaws armed with teeth, with other reptilian characteristics..

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..

Spine :: Spine (n.) The backbone, or spinal column, of an animal; -- so called from the projecting processes upon the vertebrae..

Vertebral :: Vertebral (a.) Of or pertaining to a vertebrae, or the vertebral column; spinal; rachidian..

Amphicoelous :: Amphicoelous (a.) Having both ends concave; biconcave; -- said of vertebrae.

Opisthocoelous :: Opisthocoelous (a.) Concave behind; -- applied especially to vertebrae in which the anterior end of the centrum is convex and the posterior concave.

Isospondylous :: Isospondylous (a.) Of or pertaining to the Isospondyli; having the anterior vertebrae separate and normal.

Rhachiodont :: Rhachiodont (a.) Having gular teeth formed by a peculiar modification of the inferior spines of some of the vertebrae, as certain South African snakes (Dasypeltis) which swallow birds' eggs and use these gular teeth to crush them..

Intertransverse :: Intertransverse (a.) Between the transverse processes of the vertebrae.

Thorax :: Thorax (n.) The part of the trunk between the neck and the abdomen, containing that part of the body cavity the walls of which are supported by the dorsal vertebrae, the ribs, and the sternum, and which the heart and lungs are situated; the chest..

Whettlebones :: Whettlebones (n. pl.) The vertebrae of the back.

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