Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

902Maggenti and Gardnertetrasomic a. [Gr. tetra, four; soma, body] Polysomic cellswith one chromosome represented 4 times in a normaldiploid; 2n+2.tetrathyridium n. [Gr. tetra, four; thyridion, window] (PLATY:Cestoda) A cysticercoid of Mesocestoides which has a solidbody and a scolex not surrounded by special membranes.tetrathyridial a.tetraxon n. [Gr. tetra, four; axon, axis] (PORIF) A spicule of 4equal and similar rays meeting at equal angles; tetractine;quadriradiate. tetraxonid a.thalassophilous a. [Gr. thalassa, sea; philos, loving] Inhabitingor dwelling in the sea; pelagic; thalassic.thallus n. [Gr. thallos, young shoot] The body or colony of acompound animal.thamnophilous a. [Gr. thamnos, shrub; philos, loving] Inhabitingthickets or dense shrubbery.thanatocoenosis n. [Gr. thanatos, death; koinos, common]An assemblage of fossils comprised of the remains of organismsbrought together after death. see biocenosis.thanatosis n. [Gr. thanatos, death] Feigning death; letisimulation.theca n.; pl. thecae [Gr. theke, case] 1. A sheath or sac-likecovering or structure for an organ or organisms, as proboscis,tubes, shells, pupa or larvae. 2. (ANN: Oligochaeta)Spermatheca. 3. (ARTHRO: Insecta) A fold or sheath fromphallobase enclosing the aedeagus. 4. (ECHINOD: Crinoidea)The skeleton. thecal, thecate a.thelycum n. [Gr. thelykos, feminine] (ARTHRO: Crustacea) Insome female Decapoda, an external pocket on the ventralside of the thorax, functioning as a seminal receptacle.thelygenous a. [Gr. thelys, female; genes, producing] Producingmostly or only female offspring; arrhenogenous.thelygenesis n.thelyotoky n. [Gr. thelys, female; tokos, offspring] A type ofparthenogenesis in which unfertilized eggs develop into females;thelytoica. thelyotokous a. see arrenotoky,deuterotoky, amphitoky.