costa

From ZooTerms (Dictionary of Invertebrate Zoology)
Revision as of 16:24, 6 September 2013 by Andreas Plank (Talk | contribs) (Created page with "{{Concept |label=costa |lexical category=noun; plural <b>cortices</b>; adjective <b>cortical</b> |etymology=Latin <i>cortex</i>, bark |definition=1. The outermost covering lay...")

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
costa (noun; plural cortices; adjective cortical; Latin cortex, bark): 1. The outermost covering layer of a structure. 2. (Porifera) The ectosome when thick and gelatinous or fibrous, or packed with spicules of a special type.

costa noun; plural costae; adjective costal [Latin costa, rib] 1. Any rib-like structure. 2. (Arthropoda: Crustacea) Any thickened portion of the peniferum of ostracods. 3. (Arthropoda: Insecta) a. The longitudinal wing vein of certain insects, forming the anterior margin of the wing. b. A dorsal, marginal part of the valva of male Lepidoptera, bearing a variety of structures and processes. 4. (Brachiopoda) a. Radial ridge on the exterior surface of the shell, originating at the margin of the protegulal node. b. Any coarse rib. 5. (Bryozoa: Gymnolaemata) One of commonly two spines fused medially and intermittently laterally, that form the costal shield of cribrimorph cheilostomate zooids. 6. (Cnidaria) Prolongations of the septa of certain corals, that connect to the surface layer. 7. (Ctenophora) The row of swimming plates (ctenes) that occupy adradial positions. 8. (Mollusca) The rounded ridge on the surface of a mollusk shell, greater than a chord.