Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 175netic a. see palingenesis.cenogenous a. [Gr. koinos, common; gennaein, to produce]Oviparous at one season of the year and at other times viviparous.cenosis, coenosis n. [Gr. koinos, common] 1. A community;biocoenosis. 2. Association. 3. A community dominated bytwo distinct species, that may or may not be mutually antagonistic.cenospecies n.pl. [Gr. kainos, recent; L. species, kind] Speciesthat can interbreed.Cenozoic a. [Gr. kainos, recent; zoe, life] A geological historyfrom the beginning of the Tertiary to the present, that sawa rapid evolution of mammals, birds, grasses, shrubs, andhigher flowering plants, but with little change in invertebrates.centigrade see celsiuscentimeter n. [L. centum, hundred; metron, measure] Onehundredth (.0l) part of a meter or two fifths (0.3937) of aninch. Abbrev. cm. see meter.centrad adv. [Gr. kentron, center; L. ad, toward] Toward thecenter or interior.centradenia n. [Gr. kentron, center; aden, gland] (CNID: Hydrozoa)A type of siphonophore hydroid colony.central area 1. (MOLL: Polyplacophora) The upper surface ofan intermediate valve, lying centrally, and sometimes differingin sculpture from the lateral areas. 2. (NEMATA: Secernentea)The nonstriated region around the vulva in theMeloidogyne perineal pattern.central cell (PORIF) A cell located in the cavity of a choanocytechamber.central nervous system In invertebrates, a system to whichthe sensory impulses are transmitted and from which motorimpulses pass out. a. In radially symmetric animals,structured in the form of one or two rings. b. In elongateanimals, usually consists of an anterior bilobed cerebralganglion (brain), and paired longitudinal ventral cords thatare usually connected by the circumesophageal nerve ring.