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Exoskeleton :: Exoskeleton (n.) The hardened parts of the external integument of an animal, including hair, feathers, nails, horns, scales, etc.,as well as the armor of armadillos and many reptiles, and the shells or hardened integument of numerous invertebrates; external skeleton; dermoskeleton..

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..

Otocyst :: Otocyst (n.) An auditory cyst or vesicle; one of the simple auditory organs of many invertebrates, containing a fluid and otoliths; also, the embryonic vesicle from which the parts of the internal ear of vertebrates are developed..

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

Invertebrate :: Invertebrate (n.) One of the Invertebrata.

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..

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..

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

Gizzard :: Gizzard (n.) A thick muscular stomach found in many invertebrate animals.

Perisome :: Perisome (n.) The entire covering of an invertebrate animal, as echinoderm or coelenterate; the integument..

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

Pseudo-heart :: Pseudo-heart (n.) Any contractile vessel of invertebrates which is not of the nature of a real heart, especially one of those pertaining to the excretory system..

Uropoetic :: Uropoetic (a.) Of, pertaining to, or designating, a system of organs which eliminate nitrogenous waste matter from the blood of certain invertebrates..

Chitin :: Chitin (n.) A white amorphous horny substance forming the harder part of the outer integument of insects, crustacea, and various other invertebrates; entomolin..

Disk :: Disk (n.) The lower side of the body of some invertebrates, especially when used for locomotion, when it is often called a creeping disk..

Eye-spot :: Eye-spot (n.) A simple visual organ found in many invertebrates, consisting of pigment cells covering a sensory nerve termination..

Invertebrate :: Invertebrate (a.) Destitute of a backbone; having no vertebrae; of or pertaining to the Invertebrata.

Radiata :: Radiata (n. pl.) An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere..

Vulva :: Vulva (n.) The orifice of the oviduct of an insect or other invertebrate.

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

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