Comparative external ultrastructure and diffusion pathways in styloconic sensilla on the maxillary galea of larval Mamestra configurata (Walker) (Lepidoptera: Noctuidae) and five other species

Journal of Morphology
Vonnie D C Shields

Abstract

The external ultrastructure of sensilla on the maxillary galea are investigated in Mamestra configurata and five other lepidopterous larvae using scanning electron microscopy. The galea and lacinia, comprising the mesal lobe of the maxilla, are either completely separate, fused, or incompletely fused in these species. The distal surface of the mesal lobe of all species examined bears two styloconic sensilla, three basiconic sensilla, and three trichoid sensilla, whereas the midventral wall of this lobe bears a campaniform sensillum. The latter sensillum is visible in only three of the six species examined. The styloconic and basiconic sensilla occupy a ventro anterior location, whereas the trichoid sensilla are positioned dorsoposteriorly. Interspecific comparisons of galeal size, as well as sensillar size, shape, and position are made for all species. The styloconic sensilla are the only sensillar type permeable to an aqueous solution of cobalt chloride when viewed by brightfield light microscopy in all species examined. Cobalt ions permeate through the terminal pore of each styloconic peg and percolate through the fenestrated fibrillar pore matrix, located directly below the pore. These ions permeate along the dendritic chann...Continue Reading

References

Jan 1, 1976·Journal of Insect Physiology·J L BroylesA M Shapiro
Sep 1, 1975·Journal of Insect Physiology·I Shimada
Mar 1, 1967·Journal of Neurophysiology·M V BennettG D Pappas
Dec 1, 1955·The Quarterly Review of Biology·V G DETHIER
Jan 1, 1971·Tissue & Cell·S D Hawke, R D Farley

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