Recurrent: running backward: applied to nerves it = stomatogastric.
Recurrent nervure: in Hymenoptera (Nort.), is the medial cross vein (Comst.), from the point of branching to the junction.
Recurrent vein: in Hemerobiidae, the first branch of the subcosta when it recurves toward the base of the wing.
Reductus: a zig-zag marking or corrugation.
Reflected or Reflexed: angularly bent backward.
Region: a space or area adjoining a specified point: a part of the body composed of a number of segments, as the head, the thorax, or the abdomen.
Rejuvenescence: a renewal of youth; bringing back to a condition of youth.
Reniform: kidney-shaped: applied to a macula approximating that shape, found at the end of median cell in many moths.
Repand: wavy; with alternate segments of circles and intervening angles.
Replicate: wings folded back upon the base; like the secondaries in Coleoptera.
Replicatile: capable of being folded back.
Repugnatorial: serving to repel: so offensive as to drive away: applied to glands that secrete an offensive material.
Reservoir: a case or cavity for the storage of any fluid or secretion.
Resilient: elastic; having the property of springing back.
Respiration: breathing or taking breath: union of oxygen with tissues and liberation of carbon dioxide from same.
Restricted: held back: confined to a limited area.
Resupinate: upside down; horizontally reversed.
Rete: the fatty mass of insects: also applied generally to any structureless membrane or layer.
Retina: that portion of the eye upon which the image is formed.
Retinaculum: in Lepidoptera, the loop into which the frenulum of the male is fitted; = hamus, q.v.: in Hymenoptera, horny, movable scales serving to move the sting or to prevent its being darted out too far: in Coleoptera, the middle, tooth-like process of the larval mandible.
Retinal pigment: the pigment layer of the compound eye just above the basilar or fenestrate membrane.
Retinula -ae: the retina of a single ocellus: the nerve fibres or cells between pigment cells and retina of the compound eye.
Retracted: drawn back; opposed to prominent.
Retractile: capable of being drawn in or retracted.
Retractor: used in drawing in or back; as a muscle.
Retrocession: the going or moving backward.