Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

130Maggenti and Gardnerbilaterally symmetrical larva; characterized by ciliated preoraland postoral bands and extending onto lobes projectingfrom the body; dipleurula larva. see brachiolaria.biplicate a. [L. bis, two; plicatus, fold] Twice plaited or folded.bipocillus n. [L. bis, two; poculum, cup] (PORIF) A spicule (microsclere)with a curved shaft and cup-shaped expansion ateither end; in Iophon , one discoid end and one pointed orforked end.bipod a. [L. bis, two; Gr. pous, foot] Having one pair of legs.bipody n. see tetrapod.bipolar a. [L. bis, two; polus, pole] 1. Having two poles orprocesses. 2. Pertaining to the polar regions.bipolarity n. [L. bis, two; polus, pole] 1. Being bipolar. 2.Pertaining to the polar regions, as comparing the flora andfauna between the northern regions and the southern regions,and with that in between. 3. Nerves having processesat both ends.biprostatic a. [L. bis, two; pro, before; stare, to stand] Havingtwo prostates.bipupillate a. [L. bis, two; pupilla, pupil of the eye] 1. Havingtwo pupils. 2. Having two ocelli or spots that resemble twopupils.biradial cleavage Cleavage in which the tiers of blastomeresare symmetrical with regard to the first cleavage plane.biradial symmetry A type of symmetry in which an organismconsists of radially arranged parts, equally arranged oneach side of a median longitudinal plane.biradiate a. [L. bis, two; radiatus, rayed] Having two rays orspokes. see diactinal, diaxon.biramous a. [L. bis, two; ramus, branch] Consisting of twobranches.biramous appendage (ARTHRO: Crustacea) An appendagewith two rami; also antennule or antenna with two flagellarelements; not all appendages of a crustacean are biramous.biramous parapodium (ANN) A parapodium having bundles ofsetae on both noto- and neuropodium.