The Antennal Sensilla of Oxelytrum erythrurum (Blanchard) and O. apicale (Brullé) (Coleoptera: Silphidae)."

OLIVA, A.

NEOTROPICAL ENTOMOLOGY

ENTOMOLOGICAL SOC BRASIL

Lugar: BRASIL; Año: 2012 vol. 41 p. 395 - 403

1519-566X

ABSTRACT- The typology and placement of antennal sensilla of the 23 carrion beetles Oxelytrum erythrurum (Blanchard) and O. apicalis (Brullé) (Coleoptera: Silphidae) were  studied using scanning electron microscopy. Two types of sensilla chaetica, two types of  sensilla trichodea, four types of sensilla basiconica, one type of sensilla coeloconica and an unidentified type of sensillum were found in both species. Sensilla chaetica type 1 are found on the antennomeres proximal to antennal club (A 1 - A 8); chaetica type 2 are found on the club (A 9- A 11). Sensilla trichodea are found on A9-A11; one type (T1) is found on the proximal portion of the club, the other type (T2) on the apical portion. Basiconica type 1 are found on the dorsal surface of A9-A11; they are much denser on the apical portion of the antennal club than on the proximal. In O. erythrurum, a nocturnal species of the Chaco-Pampean plain, T2 2 are found on A10 and A11. In O. apicale, a mountain species, probably diurnal, only A11 bears T2, but they are denser than in the other species. It is suggested that O. apicale depends more on contact chemoreception than O. erythrurum. The ventral surface of the antennal clubs shows no remarkable difference between species.23 carrion beetles Oxelytrum erythrurum (Blanchard) and O. apicalis (Brullé) (Coleoptera: Silphidae) were  studied using scanning electron microscopy. Two types of sensilla chaetica, two types of  sensilla trichodea, four types of sensilla basiconica, one type of sensilla coeloconica and an unidentified type of sensillum were found in both species. Sensilla chaetica type 1 are found on the antennomeres proximal to antennal club (A 1 - A 8); chaetica type 2 are found on the club (A 9- A 11). Sensilla trichodea are found on A9-A11; one type (T1) is found on the proximal portion of the club, the other type (T2) on the apical portion. Basiconica type 1 are found on the dorsal surface of A9-A11; they are much denser on the apical portion of the antennal club than on the proximal. In O. erythrurum, a nocturnal species of the Chaco-Pampean plain, T2 2 are found on A10 and A11. In O. apicale, a mountain species, probably diurnal, only A11 bears T2, but they are denser than in the other species. It is suggested that O. apicale depends more on contact chemoreception than O. erythrurum. The ventral surface of the antennal clubs shows no remarkable difference between species.