hematopoiesis n. [Gr. haima, blood; poietes, maker] The formation of blood cells; also spelled haematopoiesis, haemopoiesis, hemopoiesis.
hemelytron n.; pl. -tra [Gr. hemisys, half; elytron, sheath] (ARTHRO: Insecta) A fore wing in which only the basal portion is hardened; wing-covers; also spelled hemelytran, hemelytrum, hemielytron. hemelytral a. see elytron, tegmen.
hemerophilic a. [Gr. hemeros, cultivated; philos, loving] Having the ability to withstand culture and human interference with the environment. see hemerophobic.
hemerophobic a. [Gr. hemeros, cultivated; phobos, fear] Lacking the ability to withstand culture and human interference with the environment. see hemerophilic.
hemianamorphosis n. [Gr. hemisys, half; ana, on; morphe, form] Post-embryonic development beginning as anamor-phic and later becomes epimorphic.
hemibranch n. [Gr. hemisys, half; branchos, gill] Gill filaments only on one side; demibranch.
hemicephalous a. [Gr. hemisys, half; kephale, head] (AR-THRO: Insecta) Referring to dipteran larvae with reduced head capsule retractable within the thorax; an intermediate condition between eucephalous and acephalous; hemi-cephalic.
hemidesmosome n. [Gr. hemisys, half; desmos, bond; soma, body] Attachment process of the epidermal cell to the cuticle; process from the cuticle to which microtubules are attached. see desmosome, tonofibrillae.
Hemimetabola n. [Gr. hemisys, half; metabole, change] A division of insects in some classifications (=Exopterygota) in which the nymphs live an aquatic life as opposed to the adult form.
hemimetabolous metamorphosis (ARTHRO: Insecta) Simple or gradual metamorphosis in which the nymphs are generally similar in body form to the adults, but resemble the adults more with each instar.
hemiomphalous a. [Gr. hemisys, half; omphalos, the navel] (MOLL: Gastropoda) Having the opening of the umbilicus partly plugged.
hemiphragms n.pl. [Gr. hemisys, half; phragma, wall] (BRYO: Stenolaemata) Shelf-like skeletal projections into the zooid living chamber alternating from opposite sides of the zooe-cia; hemiphragms in any single zooid usually comparable in morphology. see hemisepta.
hemipneustic a. [Gr. hemisys, half; pnein, to breath] Having 8 functional spiracles. see polypneustic.
hemiseptum n.; pl. hemisepta [Gr. hemisys, half; L. septum, wall] (BRYO: Stenolaemata) Shelf-like projections into zooid living chambers; usually on proximal walls, but also in pairs on proximal and distal walls which differ in morphology. see hemiphragms.
hemispondylium n.; pl. -ia [Gr. hemisys, half; spondylos, back] (BRACHIO) In Thecideidae, one of two small plates attached to a medium septum and not to the valve floor or side walls, bearing the median adductor muscles.
hemisyrinx n. [Gr. hemisys, half; syrinx, pipe] (BRACHIO) A
median, conical chamber on the spondylium floor, posteriorly marked by a pair of lateral ridges.
hemitergite n. [Gr. hemisys, half; L. tergum, back] (ARTHRO: Insecta) 1. Any tergite that is divided into two plates. 2. Adult male Embiidae with tergum 10 divided into a pair of asymmetrical plates. 3. In female Apoidea, the divided 7th gastral tergum.
hemitrope a. [Gr. hemisys, half; tropos, a turn] Being half turned around; half inverted.
hemizonid n. [Gr. hemisys, half; L. zona, girdle] (NEMATA: Se-cernentea) A nerve commissure from the nerve ring that is highly refractive at the point it joins the ventral nerve cord near the excretory pore. see cephalids, hemizonion, caudalid.
hemizonion n. [Gr. hemisys, half; L. zona, girdle] (NEMATA: Secernentea) A small nerve commissure slightly posterior to the hemizonid.
hemizygous a. [Gr. hemisys, half; zygon, yoke] A gene with no allele; gene in a haploid organism; sex linked gene as in xy-xx; gene in a part of a chromosome where the corresponding part has been deleted.
hemocoel, haemocoele n. [Gr. haima, blood; koilos, hollow] 1. (ARTHRO) The main body cavity, the embryonic development of which differs from that of a true coelom, but which includes a vestige of that true coelom that emanates from the blood spaces of the embryo, or remnants of the blastocoel after invasion of the latter by the mesoderm. 2. (MOLL) The main body cavity.
hemocoelous viviparity, haemocoelous (ARTHRO: Insecta) A form of viviparity in which development occurs in the hemocoel.
hemocyanin n. [Gr. haima, blood; kyanos, dark blue] A blue oxygen carrying respiratory protein containing copper in the prosthetic group instead of iron; found in many invertebrate species.
hemocyte, haemocyte n. [Gr. haima, blood; kytos, container] A mesodermal cell, sessile or circulating, in the hemocoel or hemolymph of insects and other invertebrates. see
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