Macrostomus lineatus Rafael & Cumming, 2006

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 : 523

Macrostomus lineatus Rafael & Cumming

( Figs 12A–Q )

Macrostomus lineatus Rafael & Cumming, 2006: 54 . Type locality: Ecuador, Napo-Pastaza , Puyo.

M. lineatus: Yang et al., 2007: 145 (cat.).

Diagnosis. Male. Postcranium black with no pruinosity on upper third; thorax and legs mainly yellow ( Fig. 12A ); scutum with a median black longitudinal stripe between dorsocentral setae ( Fig. 12B ); postsutural supra-alar seta absent; hind femur distinctly clavate ( Fig. 12A ); cell dm rather truncate ( Fig. 12B ); tergite 8 ( Figs 12C, D ) with bifid distal projection and deep basal cleft; sternite 8 ( Fig. 12E ) with wide U-shaped basal sinus; epandrium ( Fig. 12F ) with posterodorsal lobe wider, slightly higher than anterodorsal lobe, with spiniform setae internally ( Fig. 12G ); anterior cercus ( Fig. 12H ) distinctly setose, with wide mesial process ( Fig. 12L ); cercal bridge ( Figs 12H–J, L ) as a well sclerotized, wide central plate; median cercus elevated, with slender setae; posterior cercus as a long, thin and curved downwards branch, inwardly and forward directed with yellow digitiform setae at apex, internally and basally with two shorter protuberances, one curved with long yellow setae at apex and the other, near base, with straight, small yellow setae at apex ( Fig. 12K ); ventral process of cercus with no distinct setae, acute distally ( Fig. 12J ); dorsal and ventral hypoproctal lobes distinct, but small, setose ( Fig. 12L ); hypandrium ( Fig. 12M ) with few posterior setae on basal third, with a long posterior trilamellar projection medially and small longitudinal grooves at apex; ejaculatory apodeme tetralamellar; phallus shorter than hypandrium length ( Fig. 12N ).

Female. Tergite 8 with wide distal sinus ( Fig. 12P ); sternite 8 with perpendicular median cleft laterally and a small, sclerotized area within the cleft ( Figs 12O, P ); genital fork ( Fig. 12Q ) with small cleft distally, with genital chamber membranous.

Geographical records. Ecuador, Peru.

Material examined. Listed in Rafael & Cumming (2006).

Remarks. This species was described based on a couple of specimens from Ecuador (Napo-Pastaza) and one female specimen from Peru (Avispas, Madre de Dios). The female specimen from Peru needs to be associated with a male from the same locality in order to ensure that it is conspecific with M. lineatus .

Figures

FIGURE 12. Macrostomus lineatus Rafael & Cumming, 2006. ♂ (A–N). A. Habitus, lateral view, before abdomen dissected; B. Habitus, dorsal view; C. Tergite and sternite 8, lateral view; D. Tergite 8, dorsal view; E. Sternite 8, ventral view; F. Epandrium, lateral view; G. Epandrium, posterodorsal view; H. Cerci lobes, lateral view; I. Cercal bridge of anterior cercus and subepandrial sclerite, anterior view; J. Anterior cercus, cercal bridge, ventral process of cercus and subepandrial sclerite, anterior view; K. Cerci lobes, posterior view; L. Cercal bridge, mesial process of anterior cercus, dorsal and ventral hypoproctal lobes, anterodorsal view; M. Hypandrium and ejaculatory apodeme, lateral view; N. Hypandrium, posterior view. ♀ (O–Q). O. Apex of abdomen, lateral view; P. Tergite 8, tergite 9+10 and cerci (inferior piece), dorsal view; sternite 8, ventral view; Q. Genital fork and genital chamber, ventral view. Scale bars, figures A–B = 1 mm; C–Q = 0.2 mm. Abbreviations: a ce, anterior cercus; ad l, anterodorsal lobe of epandrium; b scl, baciliform sclerite; c brd, cercal bridge; d hyprct l, dorsal hypoproctal lobe; m ce, median cercus; mpac, mesial process of anterior cercus; p ce, posterior cercus; pd l, posterodorsal lobe of epandrium; sbepand scl, subepandrial sclerite; st, sternite; t, tergite, v hyprct l, ventral hypoproctal lobe; vpc, ventral process of cerci.