Stomopogon inculta ( Stein, 1911 )

Fogaça, João M., Gomes, Lucas R. P., Couri, Márcia S., Rodríguez-Fernandez, Jaime I. & De Carvalho, Claudio J. B., 2021, Neotropical Stomopogon (Diptera, Muscidae): new species, redescriptions and key to species, Zootaxa 4903 (3), pp. 301-330 : 321-322

Stomopogon inculta ( Stein, 1911)

( Figs 20 A–E, 21A–D, 22A–D)

Stomopogon acuta Malloch, 1934 . New synonymy.

Type-material examined. Lectotype of S. inculta . Male: “ Chile \ 5. x. 02 \ Arica [green, printed label and partially handwritten, 02 = 1902]”; “ LECTOTYPE ♁ \ Coenosia \ inculta \ Stein, 1911 \ Des. A. C. Pont 1999 [white printed label]” ( SMT) ( Fig. 20E ). Paralectotypes of S. inculta , 3♀♀. Same data as lectotype, 2♀♀ ( SMT); Caldera, 25. v. 1903, 1♀ ( SMT). The lectotype is not well preserved. The right mid and hind legs are glued to a piece of cardboard. Holotype of S. acuta (New synonymy). Female: “ Chile \ DS Bulloch [white printed label]”; “Tocopilla \ ap. 10. 31 \ SeaBeach [ap = April; white, handwritten label]”; “Type No. \ H9865\ U. S. N. M. [red printed label]”; “ Angolia \ acuta \ Type \ det. JRMALLOCH [white print and partially handwritten label]”; “USNMENT \ QrCode \ 01406049 [white printed label]” (USNM) ( Fig. 22D ).

Diagnosis. S. inculta is the only species that has fronto-orbital plate with many setulae ( Figs 20B , 21B , 22B ) and parafacial wider than pedicel apart from S. capribarba , from which it differs by the yellow pedicel.

Redescription

Head ( Fig. 20B ). Frontal vitta dark brown; fronto-orbital plate, face, parafacial and gena dense silvery pruinose; proboscis shiny dark brown. Eye bare, distance between eyes 0.40 of maximum head-width. Antenna inserted on middle of eyes, postpedicel brown, about 1.5 times pedicel length. 5 frontal setae, between than 2 less developed; proclinate orbital seta absent; 1 upper orbital seta; ocellar seta well developed; postocellar seta divergent with same ocellar seta length; inner vertical seta parallel with 1.2 times of the ocellar seta length; outer vertical seta divergent and shorter than inner vertical seta. Palpus filiform, a little enlarged at the apex. Gena with strong, long setae.

Thorax ( Fig. 20C ). Acrostichal seta reduced; intra-alar setae 1+1, postsutural reduced; 5 anepisternal setae.

Legs ( Fig. 20A, D ). Black, with fore femur grey pruinose in basal half and yellowish on apical half. Claws and pulvilli well developed. Fore femur with a complete row of setae on pd and pv. Fore tibia with tarsi enlarged, mainly the last one. 1 p seta on median to apical half; 1 d and pd apical seta. Mid femur with 1 av seta on median half. Mid tibia with 1 pd, 1 p and 2 a median seta; apical seta on d, pd, a, v and p. Hind femur with a complete row of long setae on ad; 1 row of 6 long av setae on apical half; 1 d seta on apical half; 2 v setae on median half. Hind tibia with 3 ad, 4 pd and 1 a long setae ( Fig. 20D ); preapical seta on a and v, all well developed.

Abdomen ( Fig. 20C ). Grey, with 4 pairs of subtriangular central spots on all tergites, Sternite 5 not examined.

Terminalia . Not examined.

Female ( Fig. 21 A–D, 22A–D). Similar to male, but without pairs of subtriangular central spots on all tergites.

Remarks. Stein (1911) described S. inculta based on male (01) and females (03) from Chile. Years later, Malloch (1934) described S. acuta based on only one female, also from Chile. Analyzing type specimens of both species, we observed that all external characters of S. inculta are present in S. acuta . Also, at couplet 2 of Couri and de Carvalho’s (2002) key, S. inculta keys out to couplet 4 based on the absence of one anterior to posterior seta on the mid tibia. This, however, is in error, since this seta is present in S. inculta . Following to the couplet 3, S. acuta and S. inculta key out together and share all characters. Based on these observations, we propose the synonym of S. acuta with S. inculta .

Distribution. Chile (Arica, Chañaral, Malleco).

Figures

FIGURE 20. Stomopogon inculta (Stein, 1911), Lectotype male: A. Lateral view. B. Head, frontal view. C. Dorsal view. D. Labels. Scale bars: A: 2 mm; B, D: 1 mm; C: 2 mm.

FIGURE 21. Stomopogon inculta (Stein, 1911), Paralectotype female: A. Lateral view. B. Head, frontal view. C. Dorsal view. D. Labels. Scale bars: A, C: 2 mm; B: 0.5 mm.

FIGURE 22. Stomopogon acuta (Malloch, 1934). New synonymy, Holotype female: A. Lateral view. B. Head, frontal view. C. Dorsal view. D. Labels. Scale bars: A: 2 mm; B, D: 0.5 mm; C: 2 mm. Smithsonian open-access site: https://www.si.edu/ object/angolia-acuta:nmnhentomology_9146229 USNM collection site: http://n2t.net/ark:/65665/329d2dd6e-4169-4d89-a311- 3d51ebb1830b.