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Spicule :: Spicule (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria..

Testacea :: Testacea (n. pl.) Invertebrate animals covered with shells, especially mollusks; shellfish..

Beak :: Beak (n.) The long projecting sucking mouth of some insects, and other invertebrates, as in the Hemiptera..

Neural :: Neural (a.) relating to the nerves or nervous system; taining to, situated in the region of, or on the side with, the neural, or cerebro-spinal, axis; -- opposed to hemal. As applied to vertebrates, neural is the same as dorsal; as applied to invertebrates it is usually the same as ventral. Cf. Hemal..

Chondro- :: Chondro- () A combining form meaning a grain, granular, granular cartilage, cartilaginous; as, the chondrocranium, the cartilaginous skull of the lower vertebrates and of embryos..

Merosome :: Merosome (n.) One of the serial segments, or metameres, of which the bodies of vertebrate and articulate animals are composed..

Retinophora :: Retinophora (n.) One of group of two to four united cells which occupy the axial part of the ocelli, or ommatidia, of the eyes of invertebrates, and contain the terminal nerve fibrillae. See Illust. under Ommatidium..

Metamere :: Metamere (n.) One of successive or homodynamous parts in animals and plants; one of a series of similar parts that follow one another in a vertebrate or articulate animal, as in an earthworm; a segment; a somite. See Illust. of Loeven's larva..

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..

Skeleton :: Skeleton (n.) The more or less firm or hardened framework of an invertebrate animal.

Hematocrya :: Hematocrya (n. pl.) The cold-blooded vertebrates, that is, all but the mammals and birds; -- the antithesis to Hematotherma..

Vertebrated :: Vertebrated (a.) Having movable joints resembling vertebrae; -- said of the arms ophiurans.

Haemapodous :: Haemapodous (a.) Having the limbs on, or directed toward, the ventral or hemal side, as in vertebrates; -- opposed to neuropodous..

Notochord :: Notochord (n.) An elastic cartilagelike rod which is developed beneath the medullary groove in the vertebrate embryo, and constitutes the primitive axial skeleton around which the centra of the vertebrae and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm..

Odontornithes :: Odontornithes (n. pl.) A group of Mesozoic birds having the jaws armed with teeth, as in most other vertebrates. They have been divided into three orders: Odontolcae, Odontotormae, and Saururae..

Vertebrated :: Vertebrated (a.) Contracted at intervals, so as to resemble the spine in animals..

Air Bladder :: Air bladder () An air sac, sometimes double or variously lobed, in the visceral cavity of many fishes. It originates in the same way as the lungs of air-breathing vertebrates, and in the adult may retain a tubular connection with the pharynx or esophagus..

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

Skull :: Skull (n.) The skeleton of the head of a vertebrate animal, including the brain case, or cranium, and the bones and cartilages of the face and mouth. See Illusts. of Carnivora, of Facial angles under Facial, and of Skeleton, in Appendix..

Vertebrated :: Vertebrated (a.) Of or pertaining to the Vertebrata; -- used only in the form vertebrate.

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