Crustacea glossary. Natural History Museum of Los Angeles County. 2011.
opercular membrane — (ARTHROPODA: Crustacea) In Balanomorpha, a thin, flexible membrane attaching the opercular valves to the sheath; in Verrucomorpha, a membranous hinge … Dictionary of invertebrate zoology
opercular membrane — the tissue covering the gills laterally and enclosing (including in some, but not other definitions) the opercle, preopercle, subopercle and interopercle bones. In most Teleostei, where the membranes from each side meet under the head on the… … Dictionary of ichthyology
opercular valve — Movable plate in orifice of cirriped shell, one of pairs of scuta and terga joined to sheath by opercular membrane. [Moore and McCormick, 1969] [Martin, 2005]. One of 2 or 4 movable plates occluding aperture in sessile barnacles [McLaughlin,… … Crustacea glossary
opercular plug or spot — (NEMATA) An escape zone or plug by which a larva leaves the egg membrane … Dictionary of invertebrate zoology
sheath — In cirripeds (Balanomorpha), thickened upper part of internal shell wall and alae forming cylindrical collar to which opercular membrane is attached [Moore and McCormick, 1969]. (Subclass Cirripedia): ( ) [Anderson, 1980]. Balanus trigonus: wall… … Crustacea glossary
morphometric character — a measurement of a body part, e.g. head length; a character based on measurement. In fish, measurements are taken on a straight line basis, not around the curve of the body with the exception of such measurements specifically intended to measure… … Dictionary of ichthyology
membrana branchialis — (membranae branchiales)) opercular membrane (the tissue covering the gills laterally and enclosing (including in some, but not other definitions) the opercle, preopercle, subopercle and interopercle bones. In most Teleostei, where the membranes… … Dictionary of ichthyology
operculum — (plural opercula)) the flap externally closing the gill chamber and usually supported in Teleostomi by the opercle, propercle, subopercle and interopercle; the gill cover. In some definitions, synonymous with the opercular membrane … Dictionary of ichthyology
os tabulare — (plural ossa tabularia)) tabular bone (extrascapula (a small bone bordering the posterior margin of the skull roof in primitive Teleostomi. These bones apparently originate from enlarged scales. One of a series of from 2 8 bones known variously… … Dictionary of ichthyology
postocular — the region or distance between the posteriormost rim of the orbit and the posterior edge of the opercle (or opercular membrane) … Dictionary of ichthyology
