radial bar                           (of hind wing). The anterior of the two major supporting structures of the hind wing in beetles, formed from the veins Sc and RA and in many Polyphaga supporting the Radial cell at or near its apex.

radial bar                           (of hind wing). The anterior of the two major supporting structures of the hind wing in beetles, formed from the veins Sc and RA and in many Polyphaga supporting the Radial cell at or near its apex.

radial cell                           (of hind wing). In polyphagous beetles a cell formed by the diverging and subsquent converging of veins RA1+2 and RA3+4. May also be applied to a series of cells formed mainly by radial cross veins in Archostemata, Adephaga and Myxophaga.

radial sector                       Posterior of the two main branches of the radius, can have several branches of its own, abbreviated to Rs.

radius                                 One of the main longitudinal veins which runs near the front margin of the wing, abreviated to R

ramus                                 (pl. Rami). A projection on an antennomere. See Uniramose, Biramose.

raptorial                           Adapted to seize prey, eg. the front leg of a preying mantis.  [see picture Mantodea]    [see picture Neuroptera]

reclinate                             Bent downward so that the apex is below the base.

remigium                            The main part of the wing, chiefly responsible for maintaining and propelling the insect in flight.

reniform                             Shaped like a bean or kidney.

reticulate                            To be covered with a network pattern

retinaculum                        A connecting or retaining band or body. In Lepidoptera the locating body on the fore wing for the frenulum.

rostrum                               Beak, usually applied to a piecing mouth of a bug

rudimentary                    Not well developed.

rugose                                Wrinkled. A surface covered in a sculptured pattern.