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Osteology :: Osteology (n.) The science which treats of the bones of the vertebrate skeleton.

Enteropneusta :: Enteropneusta (n. pl.) A group of wormlike invertebrates having, along the sides of the body, branchial openings for the branchial sacs, which are formed by diverticula of the alimentary canal. Balanoglossus is the only known genus. See Illustration in Appendix..

Ommatidium :: Ommatidium (n.) One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates..

Somite :: Somite (n.) One of the actual or ideal serial segments of which an animal, esp. an articulate or vertebrate, is is composed; somatome; metamere..

Mesoderm :: Mesoderm (n.) The middle body layer in some invertebrates.

Retineum :: Retineum (n.) That part of the eye of an invertebrate which corresponds in function with the retina of a vertebrate.

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..

Oar :: Oar (n) An oarlike swimming organ of various invertebrates.

Uterus :: Uterus (n.) A receptacle, or pouch, connected with the oviducts of many invertebrates in which the eggs are retained until they hatch or until the embryos develop more or less. See Illust. of Hermaphrodite in Append..

Sauropsida :: Sauropsida (n. pl.) A comprehensive group of vertebrates, comprising the reptiles and birds..

Sporozoa :: Sporosac (n.) An early or simple larval stage of trematode worms and some other invertebrates, which is capable or reproducing other germs by asexual generation; a nurse; a redia..

Hair :: Hair (n.) One the above-mentioned filaments, consisting, in invertebrate animals, of a long, tubular part which is free and flexible, and a bulbous root imbedded in the skin..

Retinula :: Retinula (n.) One of the group of pigmented cells which surround the retinophorae of invertebrates. See Illust. under Ommatidium.

Sternum :: Sternum (n.) A plate of cartilage, or a series of bony or cartilaginous plates or segments, in the median line of the pectoral skeleton of most vertebrates above fishes; the breastbone..

Archetype :: Archetype (n.) The plan or fundamental structure on which a natural group of animals or plants or their systems of organs are assumed to have been constructed; as, the vertebrate archetype..

Saururae :: Saururae (n. pl.) An extinct order of birds having a long vertebrated tail with quills along each side of it. Archaeopteryx is the type. See Archaeopteryx, and Odontornithes..

Hermaphrodite :: Hermaphrodite (n.) An individual which has the attributes of both male and female, or which unites in itself the two sexes; an animal or plant having the parts of generation of both sexes, as when a flower contains both the stamens and pistil within the same calyx, or on the same receptacle. In some cases reproduction may take place without the union of the distinct individuals. In the animal kingdom true hermaphrodites are found only among the invertebrates. See Illust. in Appendix, under Helmi

Keratose :: Keratose (n.) A tough, horny animal substance entering into the composition of the skeleton of sponges, and other invertebrates; -- called also keratode..

Ovipara :: Ovipara (n. pl.) An artifical division of vertebrates, including those that lay eggs; -- opposed to Vivipara..

Pharyngopneusta :: Pharyngopneusta (n. pl.) A group of invertebrates including the Tunicata and Enteropneusta.

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