Microscopia eletrônica de varredura de duas espécies de Fannia Robineau-Desvoidy (Diptera, Fanniidae)

Abstract

ABSTRACT. Scanning electron microscopy in two species of Fannia Robineau-Desvoidy, (Diptera, Fanniidae). The species Fannia pusio Wiedemann, 1830 and F. trimaculata Stein, 1898 belong to the canicularis group and pusio subgroup. These species are morphologically very similar and usually distinguished from each other by a line of bristles on the males hind femur. The scanning electron microscopy analysis showed a smaller number of orifices on the dorsal surface of the egg in the structure called "cellas" and, on the ventral surface, less rugosity was noted, both in F. trimaculata. On the larvae, the stigma or protothoracic spiracle was outstanding, where F. trimaculata possess two short tegumental extensions and seven long ones, while F. pusio has nine extensions, all long, of equal length. Males of F. trimaculata present alongside a line of longer bristles located more externally on the facet, another line of shorter bristles, which is absent in males of F. pusio, but present in females of both species.

Larval morphology of the lesser housefly, Fannia canicularis

“…The spiracular plates in second and third instars show one and two trichoid sensilla, respectively (Figs 2C, 7G, 7H). Holloway (1984) reported the presence of circular sensilla on the posterior spiracular plate in three undescribed New Zealand endemics, but Couri (1992) and Al Gazi et al (2004) did not report any such sensilla in their SEM studies of two species of Neotropical Fannia . No additional information on the presence of such sensilla in other calyptrate species has been reported (Courtney et al , 2000).…”

“…Scanning electron microscopy (SEM) has been used previously in Fanniidae by Hinton (1981) to study egg morphology, by Couri (1992) to investigate the egg, third instar and puparium of Fannia pusio (Wiedemann), and by Al Gazi et al (2004) to examine the eggs, third instars, puparia and adults of F. pusio and Fannia trimaculata (Stein). The aim of this study is to provide detailed morphological documentation of all larval instars of F. canicularis .…”

Taxonomia de Fanniidae (Diptera) do sul do Brasil - II: novas espécies e chave de identificação de Fannia Robineau-Desvoidy

“…Neste subgrupo as espécies podem ser muito similares entre si, principalmente as fêmeas. Al Gazi et al (2004) estados brasileiros, devido à falta de material nas coleções observadas para os estados da Região Sul. A espécie foi assumida para esta região, pois foi registrada por Pinto & Brum (1998) e Carvalho et al (2002, além de apresentar ampla distribuição geográfica.…”