tailieunhanh - Dictionary Of Invertebrate Zoology - U

U uliginose, uliginous a. [L. uliginosus, swampy] Of or pertaining to mud; swampy. ultradextral a. [L. ultra, beyond; dexter, right] (MOLL: Gastropoda) Having a shell appearing to be sinistral but soft parts organized dextrally; hyperstrophic. | U uliginose uliginous a. L. uliginosus swampy Of or pertaining to mud swampy. ultradextral a. L. ultra beyond dexter right MOLL Gastropoda Having a shell appearing to be sinistral but soft parts organized dextrally hyperstrophic. ultrasinistral a. L. ultra beyond sinister left MOLL Gastropoda Having a shell appearing to be dextral but soft parts organized sinistrally hyperstrophic. ultrasonic a. L. ultra beyond sonus sound High frequency sounds inaudible to the human ear. ultrastructure n. L. ultra beyond struere to construct The fine structure of cells seen with an ultramicroscope or an electron microscope. umbel n. L. umbella a sunshade 1. An arrangement in which a number of processes nearly equal in length spread from a common center. 2. CNID Anthozoa In Umbellulidae polyps coming from a common center forming a cluster as in the anthocodia of Umbellula . 3. porif Processes extending from the clavules. umbilical suture MOLL Gastropoda In phaneromphalous type shells a continuous line separating successive whorls. umbilicus n. pl. -lici L. umbilicus navel 1. A navel or navel-like depression 2. MOLL Gastropoda A cavity formed around the shell axis between the faces of the adaxial wall of the whorls where these do not coalesce to form a solid columella. a. In conispiral shells opening at the base of the shell excepting hyperstrophic type. b. Involute shells may have two umbilici an upper or adapical and lower or abapical in asymmetrical types and left and right in isostrophic types. umbilicate a. umbo n. pl. umbones umbos L. umbo knob or boss 1. ARTHRO Crustacea a. In Cirripedia a portion of the plate from which successive growth increments extend. b. In bi- 928 Maggenti and Gardner valves apical portion of either valve. see beak. 2. ar-THRO Insecta In Coleoptera an elevated knob on the humeral angle of the elytra. 3. BRACHIO Apical portion of either valve containing the beak. 4. BRYO Gymnolaemata In Cheilostomates a blunt knob on the front wall of the ovicell. 5. .