Macrostomus limbipennis (Bezzi)

Rafael, José Albertino & Marques, Dayse Willkenia A., 2021, Four new species of Macrostomus Wiedemann and a checklist of Empididae s. str (Diptera) from Peru, Zootaxa 4981 (3), pp. 506-530 : 514

Macrostomus limbipennis (Bezzi)

( Figs 6A–M )

Rhamphomyia limbipennis Bezzi, 1909: 329 . Type locality: Peru, Pasco, Pichis, Puerto Bermudez .

Rhamphomyia (Lundstromiella) limbipennis: Melander, 1928: 183 .

Macrostomus limbipennis: Collin, 1933: 210 ; Smith, 1961: 54; 1967: 30 (cat.); Rafael & Cumming, 2004: 446 (cit.); Yang et al., 2007: 145 (cat.); Rafael & Cumming, 2012 (redescr.); Rafael & Marques, 2019: 273 (cit.).

Diagnosis. Male. Postgenal and antepronotal setae as strong as dorsal thoracic setae; cell dm slightly projected ( Fig. 6A ); tergite 8 fused with sternite 8, humped with microspinulose expansion ( Figs 6B–C ); epandrium ( Fig. 6D ) with anterior and posterior lobes of the same height; anterior cercus ( Figs 6E, F ) bearing a posterior protuberance, seen in lateral view ( Fig. 6G ), and a wide mesial process of anterior cercus apparently connected medially, seen in posterior view ( Fig. 6H ); median cercus ( Figs 6E, F ) elevated, somewhat membranous with long setae; posterior cercus ( Figs 6E, F ) widened distally; ventral projection of cercus ( Figs 6H, I ) down and obliquely directed with elongated distal setae; dorsal hypoproctal lobe ( Fig. 6H ) smaller than ventral hypoproctal lobe and transversely placed in relation to ventral lobe, both with slender setae; hypandrium ( Figs 6J, K ) somewhat narrow, subequal in diameter along entire length, with biseriate row of setae placed at basal half, dorsal pair longer; ejaculatory apodeme ( Fig. 6J ) with short dorsal lamella.

Female. Tergite 8 ( Fig. 6L ) widened laterally, with distinct sulcus distally; sternite 8 ( Figs 6L, M ) divided; genital fork ( Fig. 6M ) as a small rod with apex slightly wider, with genital chamber highly sclerotized; spermathecal duct elongated, widened medially and with spherical spotted receptacle distally ( Fig. 6M ).

Geographical records. Bolivia, Brazil, Ecuador, Peru.

Material examined. All specimens listed in Rafael & Cumming (2012) and the additional following specimens: PERU: Cuzco, Quincemil , 13–31.viii.[19]62, L. Pena, 780 m (4♂, 1♀ INPA) ; idem, 1–15.xi,[19]62, L. Pena, 700 m (8♂, 6♀ INPA) ; Pasco, Puerto Bermudez , 800 m, 6.xi.1984, M. Cooper (1♂ NHMUK) ; idem (1♀ NHMUK) ; Cuzco, Quincemil , 13º13′03.4″S – 70º43′40″W, 633 m, 23–31.viii.2012, sweep, JA Rafael, RR Cavichioli, DM Takiya (2♂, 3♀ INPA) ; Quincemil, Pte la Cigarra , 13º08′27″S – 70º23′14″W, 350 m, 01.ix.2012, sweep, JA Rafael, RR Cavichioli (7♂ MUSM) ; Quincemil, Rio Araza , 13º21′18″S – 70º53′27″W, 1000 m, 22–26.viii.2012, sweep, JA Rafael, RR Cavichioli (1♂, 2♀ MUSM) .

Remarks. Unlike most species of Macrostomus , M. limbipennis is widespread in the Amazon Basin, with records from Bolivia, Brazil, Ecuador and Peru. The Brazilian specimens are from the western border of the country, bordering the Amazonian environment of the other countries and conspecific with Peruvian specimens.

Figures

FIGURE 6. Macrostomus limbipennis (Bezzi, 1909). ♂ (A–K). A. Habitus, lateral view; B. Apex of abdomen, lateral view; C. Tergite 8, dorsal view; D. Epandrium detached, lateral view; E. Cerci lobes, epandrium detached, left lateral view; F. Cerci lobes, epandrium detached, left lateral view; G. Anterior cercus, cercal bridge and subepandrial sclerite, anterior view; H. Idem, posterior view; I. Apex of ventral projection of cercus and subepandrial sclerite, anterior view; J. Hypandrium, lateral view; K. Hypandrium, posterior view. ♀ (L–M). L. Apex of abdomen, lateral view; M. Sternite 8 (inferior piece), genital fork, genital chamber and spermatheca, ventral view. Scale bars, figures A = 1 mm; B, L = 0.3 mm; C–K, M = 0.2 mm. Abbreviations: a ce, anterior cercus; b scl, bacilliform sclerite; c brd, cercal bridge; d hyprct l, dorsal hypoproctal lobe; gen ch, genital chamber; gen fk, genital fork; hypd, hypandrium; m ce, median cercus; mpac, mesial process of anterior cercus; ph, phallus; p ce, posterior cercus; sbepand scl, subepandrial sclerite; spmth, spermatheca; st, sternite; t, tergite; v hyprct l, ventral hypoproctal lobe; vpc, ventral process of cerci. Scale bars, figure A = 1 mm; B–L = 0.2 mm.