Sensory organs of the antenna of two Fannia species (Diptera: Fanniidae)

Abstract

The latrine fly (Fannia scalaris) and lesser house fly (Fannia canicularis) are ubiquitous fanniid species of forensic and medical importance. The external morphology of sensilla on the antennae is studied using a stereoscopic microscope and scanning electron microscope, and the internal structure of the antennae is revealed by paraffin sections under the light microscope and laser scanning confocal microscope. Only grooved bristles are found on the scape and pedicel. Four major types of surface sensilla are found on the antennal funiculus and are classified as: (a) trichoid sensilla, (b) two subtypes of basiconic sensilla, (c) clavate sensilla, and (d) coeloconic sensilla. Density of each sensilla type of the two species is calculated. A remarkable difference is observed that the higher density of clavate sensilla occurs on the posteroventral surface in F. scalaris, whereas they are on the anterodorsal surface in F. canicularis. Several cuticular depressions that were previously known as "olfactory pits" are observed on the funiculus of both species. Combining with previous studies, they are suggested to be classified into two types: pit and sacculus. Pit is single-chambered and filled with one type of sensilla, whereas the sacculus is a multi-chambered pit organ containing several types of sensilla. Surprisingly, the pits observed in our study are mostly situated at the lateral region of the antennal funiculus, whereas in other flies, they are found on the posteroventral or anterodorsal surface of antennal funiculus. In addition, the sacculus found in our study houses only basiconic-like sensilla, which is remarkably different from other findings. Moreover, observation under light microscope indicates that previous data of the complexity and the number of the "olfactory pits," which are an important type of efficient sensory convergence, could be underestimated. Thus, more precise methods such as paraffin section or transmission electron microscope are suggested for further study.

Morphology of Flesh Fly Peckia (Peckia) chrysostoma (Diptera: Sarcophagidae) Revealed by Scanning Electron Microscopy

“…Some authors agree that male genitalia is the principal character to identify Sarcophagidae [8,17,22,23], there is, however little information pertaining to the ultrastructure of their male genitalia [8]. In this study, terminal end of the J was slightly expanded with a laterally serrated structure, but it differs of those observed in S. (Liosarcophaga) dux that is apically bifurcated [23].…”

“…In this study, terminal end of the J was slightly expanded with a laterally serrated structure, but it differs of those observed in S. (Liosarcophaga) dux that is apically bifurcated [23].…”

Ultrastructure of sensilla on antennae and maxillary palps in three Mesembrinellidae species

“…This research was carried out through the cooperation of Fundação Oswaldo Cruz ( Specimens were identified using the keys presented by Mello [12] and Kosmann et al [8]. Adult morphological terminology used in this study followed McAlpine [11], Mello [12] and Kosmann et al [8], the classification of sensilla followed by Setzu et al [16]; Zhang et al [26,27].…”

“…For instance, such as: Ameismeier [1] described the chemosensitive basiconic on antennae of adults and embryonic stages of Locusta migratoria Linnaeus, 1758 (Orthoptera); Lopes et al [9] found two types of basiconic sensilla on antennae of Phoracantha semipunctata (Fabricius, 1755) (Coleoptera); Sukontason et al [18] studied the antennal sensilla of the families Calliphoridae, Sarcophagidae and Muscidae (Diptera), and they observed that the sensilla types were morphologically similar; Nascimento et al [13] who described, the antennae sensillas of Melipona scutellaris Latreille, 1811 (Hymenoptera) collected from different altitudes, reveling the differences of trichoidea sensilla on them. Many researchers have studied the ultrastructure in adults flies to help increase the anatomical database on flies: Zhang et al [26]; Zhang et al [27]; Carriço et al [2]; Pezzi et al [15]; Carriço et al [3].…”

Typology and distribution of antennal sensory organs of adults Haematobia irritans of the Midwest Region of Brazil

“…Sensilla, presenting wall pores and similar to the clavate coeloconic sensillum and the blunt coeloconic sensillum observed in the present work were also previously identified in "stable fly" Stomoxys calcitrans (Linn., 1758) (Diptera: Muscidae: Stomoxydinae) (Tangtrakulwanich et al 2011, Zhang et al 2013.…”