Hinge plate see cardinal platform

hinge selvage (ARTHRO: Crustacea) In Ostracoda, a single ridge extending along the free margin of the carapace, when valves are closed, fitting into the selvage groove of the opposite valve; keeps valves from slipping sideways across each other.

hinge teeth 1. (BRACHIO) The tooth part of the articulating device on the ventral valve in the form of small projections along the free edge of the palintrope. 2. (MOLL: Bivalvia) A series of shelly structures near the dorsal margin and fitting into a socket in the opposite valve; functioning in holding valves in position when closed.

hirsute a. [L. hirsutus, rough, shaggy] Bearing coarse hairs or hair-like processes; shaggy.

hirudinin n. [L. hirudo, leech] (ANN: Hirudinoidea) An anticoagulant secretion of leeches.

hispid a. [L. hispidus, hairy, prickly] Covered with rough hairs or minute spines.

hispidulous a. [L. dim. hispidus, hairy, prickly] Minutely hispid.

histoblast n. [Gr. histos, tissue; blastos, bud] The imaginal disc.

histochemistry n. [Gr. histos, tissue; chemeia, transmutation] The microscopic study of the chemical characteristics of tissues.

histogenesis n. [Gr. histos, tissue; genesis, beginning] 1. The formation and development of tissues from the undifferentiated cells of the germ layers of the embryo. 2. (ARTHRO: Insecta) In holometabolic forms, histogenesis follows after histolysis of larval organs during the quiescent late larval or pupal stadia. see histolysis. histogenesis a.

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