Pialea Erichson, 1840

Gillung, Jéssica Paula & Carvalho, Claudio José Barros De, 2009, Acroceridae (Diptera): a pictorial key and diagnosis of the Brazilian genera, Zootaxa 2175, pp. 29-41 : 39

Pialea Erichson, 1840

( Figs. 24–26 )

Pialea Erichson, 1840: 160 . Type-species: Pialea lomata Erichson, 1840 .

Diagnosis. Head extremely small compared to thorax. Eyes pilose, widely separated above and below antenna, except in P. capitella . Ocellar tubercle raised ( Fig. 24, 25 ). Scapes totally ( Fig. 25 ) or only basally fused ( Fig. 24 ); pedicel shorter than the scapes ( Fig. 24, 25 ); flagellum longer than the head. Humeral crossvein absent; wing venation variable ( Fig. 26 ). Sexual dimorphism conspicuous in length and insertion of antennae and in wing length. Scapes attached to ventral surface of antennal tubercle in the female and to its anterior surface in the male. Also, antenna inserts at mid-eye or below in the female and well above the mideye in the male. Wing extends past abdomen in the female, while in male is approximately even with abdomen tip.

References. Schlinger (1956).

Brazilian species. P. antiqua ( Schlinger, 1956) [ Brazil, Rio de Janeiro, Alto Itatiaia (type-locality)], P. capitella ( Schlinger, 1956) [ Brazil, São Paulo, Cantarera (type-locality)], P. lomata ( Erichson, 1840) [ Brazil, Minas Gerais, São João del Rei (type-locality)], P. lutescens (Westwood, 1876) [ Brazil].

Figures

FIGURE 26. Wing, dorsal view, Pialea sp. 1.

FIGURES 24, 25. 24. Head, dorsal view, Pialea sp. 1; 25. Head, dorsal view, Pialea sp. 2.