Scutops ipixunensis, Freitas & Ale-Rocha, 2023

Freitas, Geovânia & Ale-Rocha, Rosaly, 2023, Taxonomic revision of the Neotropical genus Scutops Coquillett, 1904 (Diptera: Periscelididae), Zootaxa 5244 (5), pp. 401-427 : 410-412

Scutops ipixunensis sp. nov.

( Figs 7–8 , 19D , 22 )

Diagnosis: Face whitish yellow, with dorsal portion higher than wide, flattened with apical margin rounded in frontal view; gena and postgena brown, silver pruinescent band adjacent to posterior margin of eye not reaching the gena; scutum dark brown with a median short yellow stripe, rather quadrangular, not reaching the presutural area; all tibiae yellow.

Holotype male. Description. Body length: 3.5 mm; wing: 2.8 mm. Head ( Figs 7A–C ). Frons yellow; frontoorbital setulae inconspicuous, sparse, very short, thin, and brown. Face whitish yellow; dorsal portion higher than wide, flattened with apical margin rounded in frontal view. Gena and postgena brown; gena and postgena with long brown setae. Occiput with a series of long, slender, brown setae; silver pruinescent band adjacent to posterior margin of eye longer than half of the height of occiput, but not reaching gena. Antenna yellow; pedicel with three dorsal robust, dark brown setae; arista with ten dorsal and five ventral branches. Buccal pieces dark brown. Thorax ( Figs 7A, C ). Scutum dark brown with median yellow stripe between dorsocentral series short, rather quadrangular, not reaching presutural area; postpronotal lobe whitish yellow with dense silver pruinescence; notopleuron dark brown, supra-alar area pale brown to yellow with sparse silver pruinescence; scutellum yellow, slightly elevated relative to level of scutum; subscutellum brown; pleura brown, katepisternum with dorsal margin yellow. Setae: anterior dorsocentral seta 1/2 length of posterior seta; posterior katepisternal seta 2/3 length of anterior seta; basal scutellar seta 2/5 length of distal seta. Legs ( Fig. 7A ): coxae brown, trochanters yellow, femora brown with apex yellow; tibiae and tarsus yellow. Forefemur with posteroventral setae robust; midtibia with apicoventral spine black. Wing ( Fig. 19D ) brown in distal half and yellow in the remaining including the cells costal, basal and cup and basal portion of the cells r 1 and r 2+ 3; transverse preapical hyaline band incomplete. Abdomen. Tergites and sternites dark brown. Terminalia ( Figs 8A–C ): epandrium as high as wide in posterodorsal view; cercus small, ellipsoid; postgonite subrectangular in lateral view, with posterodorsal setose projection; hypandrium + phallapodeme elongate anteriorly; phallus long and slender, three times longer than hypandrium, membranous, slightly sclerotized in the lateral; ejaculatory apodeme with apical portion broadened.

Female. Similar to male. Terminalia ( Fig. 8D ): tergite and sternite 7 forming a ring higher than wide in posteroventral view; sternite 8 broad with dorsal margin slightly concave; cercus oval.

Locality records: Brazil (Amazonas) ( Fig. 22 )

Type material examined: Holotype male ( INPA). BRAZIL: Amazonas , Ipixuna , Rio Gregório , Com [unidade] Lago grande, 07°10′11.7′′S – 70º 49′10.3′′W, 22–23.v.2011, 22:00–01:00h, Arm [adilha] luminosa baixa, (J. A. Rafael J. T. Câmara, R. F. Silva, A. Somavilla, C. Gonçalves, A. Agudelo, Leg.) . Holotype condition: right anterior dorsocentral seta, distal scutellar seta and right basal scutellar seta lost; femora, left tibia and left tarsus glued in the triangle of paper; left halter lost; abdomen dissected, kept in microtube with glycerin. Paratype: BRAZIL, Amazonas , Manaus, Res [erva] km 41, P[rojeto] D[inâmica] B[iológica] de F[ragmentos] F[lorestais] [2°35′46.5″S 60°02′17.5″W], 05–06. viii.2004, Trilha B [orda]-S[ub] B[osque], ( R. Querino), 1 female ( INPA) ; idem, 29– 30.ix.2004, Interior Dossel 1 female ( INPA) .

Comments: This species can be distinguished from congeners by the short median yellow stripe on the scutum, which quadrangular, not reaching the presutural area. This condition is similar in S. chapmani . Scutops ipixunensis sp. nov. can be easily distinguished from the latter species, however, by the incomplete hyaline preapical band of the wing, the frons without a wide central brown spot, black gena, distal margin of face rounded, femora black and silvery band of occiput short.

Etymology: the specific name refers to type-locality, Ipixuna, in the state of Amazonas, in Brazil.

Figures

FIGURE 7. Scutops ipixunensis sp. nov.. A (paratype), B–C (holotype). A. Habitus, lateral view; B. Head, frontal view; C. Thorax, dorsal view.

FIGURE 8. Scutops ipixunensis sp. nov.. A–C (holotype), D (paratype). A. Epandrium, postgonite and cercus, posterodorsal view; B. Same, plus hypandrium+phallapodeme and phallus, lateral view; C. Ejaculatory apodeme; D. Female terminalia, posteroventral view.

FIGURE 19. Wings. A. Scutops chapmani Curran, 1934; B. Scutops fascipennis Coquillett, 1904; C. Scutops flavithorax sp. nov. (paratype male); D. Scutops ipixunensis sp. nov. (paratype female); E. Scutops lopesi Amorim & Vasconcelos, 1989; F. Scutops marcgrafi Amorim & Vasconcelos, 1989; G. Scutops melinus sp. nov. (holotype female); H. Scutops peruanus Hennig, 1952; I. Scutops robustus sp. nov. (paratype female). J. Scutops spinophallus sp. nov. (holotype male).

FIGURE 22. Distributional map with records of S. flavithorax sp. nov., S. goianiensis, S. ipixunensis sp. nov., S. marcgrafi and S. robustus sp. nov..