JOHNSTONS ORGAN AND CENTRAL ORGAN IN NEZARA-VIRIDULA (L) (HETEROPTERA, PENTATOMIDAE)

The fine structure of Johnston's organ and central organ in Nezara vir idula (Heteroptera, Pentatomidae) is described, Johnston's organ consi sts of 45 scolopidia distributed around the periphery of the distal pa rt of the third antennal segment (distal pedicellite). The scolopidia are anchored separately in invaginations of joint cuticle between the pedicel and flagellum, The scolopidia are amphinematic and each scolop idium comprises three sensory cells and three enveloping cells, The la tter are a proximal scolopale cell with a typical labyrinth, an attach ment cell filled with many microtubules, and a distal accessory cell a lso filled with microtubules, Axons of 17 scolopidia gather and join o ne antennal nerve; 28 scolopidia of the opposite side, extend axons in to the other antennal nerve. The central organ consists of seven monon ematic scolopidia, which comprise of one or two sensory cells, They an chor in the same joint as the scolopidia of Johnston's organ, The sens ory cell bodies of the central organ are located close to the antennal nerves, more proximally than those of Johnston's organ, The axons of four scolopidia join one antennal nerve and those of the remaining thr ee scolopidia join the other antennal nerve. Enveloping cells similar to those in Johnston's organ are present in the central organ.