MORPHOLOGY OF SENSORY STRUCTURES ON THE ANTENNAE, MAXILLARY AND LABIAL PALPI, TARSI, AND OVIPOSITOR OF ADULT CALLOSOBRUCHUS-MACULATUS AND C-SUBINNOTATUS (COLEOPTERA, BRUCHIDAE)
Gn. Mbata et al., MORPHOLOGY OF SENSORY STRUCTURES ON THE ANTENNAE, MAXILLARY AND LABIAL PALPI, TARSI, AND OVIPOSITOR OF ADULT CALLOSOBRUCHUS-MACULATUS AND C-SUBINNOTATUS (COLEOPTERA, BRUCHIDAE), Annals of the Entomological Society of America, 90(4), 1997, pp. 462-469
The sensilla on the antennae, maxillary and labial palpi, tarsi and ov
ipositor of adult Callosobruchus maculatus (F.) and C. subinnotatus (P
ic) were examined using light and scanning electron microscopy. Six ty
pes of antennal sensilla occur in both species. Type 1 are long and ha
ve longitudinal ridges and a conspicuous basal socket. These sensilla
occur in rings at the distal margin of each antennal segment; the term
inal segment bears 2 such rings. Type 2 sensilla are found on all segm
ents and have a well developed basal socket and less conspicuous cutic
ular ridges. Type 3 sensilla are numerous and found only on flagellar
segments. Type 4 sensilla are medium in length and stout. Types 5 and
6 sensilla are short, few, and are found along with type 4 sensilla in
groups distally on the distal antennal segments. Types 1 and 2 are se
nsilla chaetica, type 3 are trichodea, and types 4, 5, and 6 are sensi
lla basiconica. Sexual dimorphism in numbers of antennal sensilla is o
bserved. Maxillary and labial palps in both species have 3 types of se
nsilla. Two subtypes in type 3, fluted (3a) and blunt (3b), sensilla a
re observed in females of both species. Tarsi and ovipositor of both s
pecies have 3 types of sensilla each.