13.07.2015 Views

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

634Maggenti and Gardneropercular scar (BRYO: Gymnolaemata) In Cheilostomata, atrace <strong>of</strong> a cuticular operculum in the frontal closure <strong>of</strong> theautozooid.opercular valves (ARTHRO: Crustacea) In sessile Cirripedia,movable plates (2 or 4) occluding the aperture.operculate a. [L. operculum, lid] Having a lid or operculum.operculiform a. [L. operculum, lid; forma, shape] Having theshape <strong>of</strong> a lid or cover.operculigenous a. [L. operculum, lid; Gr. gennaein, to produce]Producing an operculum.operculigerous a. [L. operculum, lid; gero, bear] Having anoperculum.operculum n.; pl. opercula [L. operculum, lid] 1. A lid or flaplikecover. 2. (ANN: Polychaeta) In certain sedentary forms,a modified tentacle that closes the tube; in some Spirorbidae( Pileolaria and Janua ) enlarges and serves as abrood pouch. 3. (ARTHRO) a. In Chelicerata, a plate coveringthe opening <strong>of</strong> the book-lungs <strong>of</strong> spiders. b. In Crustacea,scuta and terga and sometimes associated membraneforming the apparatus occluding an aperture. c. In Diplopoda,a plate-like anterior sclerite <strong>of</strong> the vulva. d. In Insecta,various plates, flaps and specialized structures <strong>of</strong> thegenital segments. 4. (BRYO) A generally uncalcified membrane,hinged on its posterior lip that closes the zooidialorifice. see mandible. 5. (CNID: Hydrozoa) A cover sealingthe hydrotheca or gonotheca, may be up to four sections;the lid on the distal end <strong>of</strong> a nematocyst. 6. (MOLL) A corneousor calcareous structure borne by the foot serving forclosure <strong>of</strong> the aperture. 7. (PLATY) The lid-like opening <strong>of</strong>an egg-shell.opere citato L. <strong>Work</strong> cited; op. cit.; op. c.operon n. [L. opera, work] Adjacent series <strong>of</strong> nucleiotides thatcodes for messenger RNA molecules.opesiule n. [Gr. dim. ope, hole] (BRYO: Gymnolaemata) One <strong>of</strong>the small notches or pores in a cryptocyst through whichthe frontal membrane depressor muscles pass.opesium n.; pl. -ia [Gr. dim. ope, hole] (BRYO: Gymnolaemata)In Anasca, a large opening below the frontal mem-

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!