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

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..

Hair :: Hair (n.) A slender outgrowth from the chitinous cuticle of insects, spiders, crustaceans, and other invertebrates. Such hairs are totally unlike those of vertebrates in structure, composition, and mode of growth..

Vent :: Vent (n.) The anal opening of certain invertebrates and fishes; also, the external cloacal opening of reptiles, birds, amphibians, and many fishes..

Arm :: Arm (n.) A limb, or locomotive or prehensile organ, of an invertebrate animal..

Peristome :: Peristome (n.) The membrane surrounding the mouth of an invertebrate animal.

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

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

Shell :: Shell (n.) The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like..

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

Pneumoskeleton :: Pneumoskeleton (n.) A chitinous structure which supports the gill in some invertebrates.

Zoochlorella :: Zoochlorella (n.) One of the small green granulelike bodies found in the interior of certain stentors, hydras, and other invertebrates..

Corneule :: Corneule (n.) One of the corneas of a compound eye in the invertebrates.

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

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

Hypoderma :: Hypoderma (n.) An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates..

Invertebrated :: Invertebrated (a.) Having no backbone; invertebrate.

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

Ocellus :: Ocellus (n.) A little eye; a minute simple eye found in many invertebrates.

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

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