Head bulb see ballonets

head-fans (ARTHRO: Insecta) In Diptera, fan-like rays on the main part of the torma of mature larva of Simuliidae that function as filtering organs in running water, or a raking function in Crozetia .

head gland (PLATY: Trematoda) Glands of circaria which produce a secretion emitted into the matrix of the tegument that is thought to function in the postpenetration adjustment of the schistosomula.

head valve (MOLL: Polyplacophora) The anterior valve of chitons.

heart n. [A.S. heorte] Sometimes used to describe the pulsating dorsal blood vessel.

heart chamber (ARTHRO: Insecta) One of the segmental swellings of the dorsal blood vessel; ventricle.

heautotype n. [Gr. heautou, of itself; typos, image] A specimen used by the original describer as an illustration of his species and compared with the type or cotype; a hypotype.

hectocotylus, heterocotylus n. [Gr. hekaton, hundred; ko-tyle, a cup] (MOLL: Cephalopoda) A penislike process or arm utilized in spermatophore transfer to the mantle cavity of the female, in some species breaking off in the process.

heel n. [A.S. hela, heel] (ARTHRO: Insecta) In Hymenoptera larvae, padlike prolongation of the base of the tarsungulus opposing the claw.

height n. [A.S. hiehthu, height] 1. (MOLL: Gastropoda) The length parallel to the shell axis through the columella. 2. (MOLL: Bivalvia) The greatest vertical dimension through the beak at right angles to a line bisecting the adductor scars; altitude.

Was this article helpful?

0 0

Post a comment