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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 421cernentea) The cavity <strong>of</strong> the valvular apparatus in theposterior bulb <strong>of</strong> rhabditid esophagi.Hautkorper see skin bodiesHayes' plate/sense cone see nesiumH-band The region in the center <strong>of</strong> the A-band <strong>of</strong> a sarcomerecharacterized by myosin filaments and absence <strong>of</strong> actinfilaments.head n. [A.S. haefod] 1. The anterior body region. 2. (ANN:Polychaeta) The prostomium and peristomium. 3. (ARTHRO)Bearing the eyes, antennae and mouth parts. 4. (NEMATA)Comprising the lips and sensory organs, oral opening andsupporting head skeleton.head apodeme (ARTHRO: Crustacea) In crayfish, fused endopleuriteand endosternite forming an area for muscle attachmentat the anterior end <strong>of</strong> the skeleton.head bulb see ballonetshead-fans (ARTHRO: Insecta) In Diptera, fan-like rays on themain part <strong>of</strong> the torma <strong>of</strong> mature larva <strong>of</strong> Simuliidae thatfunction as filtering organs in running water, or a rakingfunction in Crozetia .head gland (PLATY: Trematoda) Glands <strong>of</strong> circaria which producea secretion emitted into the matrix <strong>of</strong> the tegumentthat is thought to function in the postpenetration adjustment<strong>of</strong> the schistosomula.head valve (MOLL: Polyplacophora) The anterior valve <strong>of</strong> chitons.heart n. [A.S. heorte] Sometimes used to describe the pulsatingdorsal blood vessel.heart chamber (ARTHRO: Insecta) One <strong>of</strong> the segmentalswellings <strong>of</strong> the dorsal blood vessel; ventricle.heautotype n. [Gr. heautou, <strong>of</strong> itself; typos, image] A specimenused by the original describer as an illustration <strong>of</strong> hisspecies and compared with the type or cotype; a hypotype.hectocotylus, heterocotylus n. [Gr. hekaton, hundred; kotyle,a cup] (MOLL: Cephalopoda) A penislike process orarm utilized in spermatophore transfer to the mantle cavity<strong>of</strong> the female, in some species breaking <strong>of</strong>f in the process.

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