Morphology and Distribution of Sensilla on the Antenna of Omoglymmius americanus (Laporte 1836) (Coleoptera: Rhysodidae)

Morphology, distribution, and number of sensilla on the female and male antennae of Omoglymmius americanus (Laporte 1836) are described using scanning electron and light microscopy. Both sexes have the same types of sensilla, 3 types of sensilla trichodea (ST), 3 types of sensilla basiconica (SB), 1 type each of sensillum coeloconicum (SCO), and sensillum ampullaceum (SA). ST sub(1) and ST sub(2) are the only non-porous types, whereas all other types are porous as indicated by their staining with silver nitrate and crystal violet. ST sub(1) is found on the scape, pedicel and all flagellomeres; ST sub(2) on all flagellomeres; ST sub(3) on flagellomeres 3-9; SB sub(1) and SB sub(2) on flagellomeres 3-9; SB sub(3) on flagellomeres 7-9; SCO and SA on the apical flagellomere. The males have significantly more SB sub(3) and SCO. Patches of microtrichia and pores are situated on the scape, pedicel and flagellomeres 1 and 2.