Ommatius yanantin, Sánchez & Camargo, 2023

Sánchez, Pável & Camargo, Alexssandro, 2023, The ampliatus species group of Ommatius Wiedemann, 1821 (Diptera, Asilidae, Ommatiinae) in Peru with the description of four new species, Zootaxa 5352 (4), pp. 501-520 : 511-515

Ommatius yanantin sp. nov.

urn:lsid:zoobank.org:act:BFD99296-5EDC-4290-9737-D11277F793B7

( Figs 46–57 , 66 )

Description of male holotype. Length: body, 12.5 mm; wing, 10.5 mm.

Diagnosis. Femora black, except narrow bases, reddish ( Figs 46–47 ); wing with costal dilation ( Fig. 48 ); hind femur tumid ( Fig. 47 ); epandrium narrowed and rounded apically ( Fig. 50 ), narrow apex markedly curved backwards, meeting the opposite one ( Figs 49, 51 ); gonocoxite wide with two macrosetae, one long and thick.

Head ( Fig. 46 ). Antenna dark brown, black setose; two black ocellar setae; face, frons and vertex black, golden pruinose, the first about a seventh width of head; mystacal macrosetae black above and yellowish bellow; palpus black, yellowish setose; proboscis black, white setose ventrally, labial setae yellowish; occiput black, gray pruinose with white setae, upper third of margin of eye with 8–10 postocular black macrosetae, uppermost proclinate. Thorax ( Fig. 46 ). Dark brown; scutum brown pruinose, except for yellow sparse pruinosity on corners of the latter and around notopleural suture; pronotum, scutellum and pleura mixed silver and pale golden pruinose. Chaetotaxy: pronotum white setose, with two pairs of yellowish macrosetae on antepronotum; postpronotal lobe white setose; scutum with black macrosetae, 2 notopleural, 1 supra-alar, 1 postalar and 4 postsutural dorsocentral; scutellar disc with few pale-yellow setae, 2 apical scutellar black macrosetae; 1 black anepimeral macroseta; anatergal setae absent; katatergal macrosetae yellow; posterior meron + metanepisternum yellow setose. Wing ( Fig. 48 ). Brownish, apical half darkened by microtrichia; veins dark brown, with costal dilation; crossvein r-m anterior to middle of discal cell; R 4+5 bifurcation slightly anterior to level of apex of discal cell; microtrichia on posterior margin of wing arranged in single row; halter brownish yellow. Legs ( Figs 46–47 ). Coxae mixed silver and pale golden pruinose; femora black, narrow bases reddish, hind femur tumid; tibiae yellow, mid and hind tibia brown ventrally and apically; tarsomeres dark brown, except first ones of fore and mid tarsi, yellow with dark apex. Chaetotaxy: fore femur black setose, long yellow setae ventrally, 1 anterodorsal short black macroseta on basal third; mid femur black setose, long yellow setae ventrally, black macrosetae, 2 anterior, 2 anteroventral, 1 anterodorsal, 1 posterodorsal, subapical; hind femur mostly yellow setose, macrosetae mostly yellowish, 2 anterior, 6 anteroventral, stouter and longer basally, 6 posteroventral, 2–3 apical ones black, 1 anterodorsal, also black, subapical; fore tibia with 2 long posteroventral yellow macrosetae; mid tibia with 2 anterodorsal, 2 anteroventral and 2 posteroventral black macrosetae; hind tibia with 4 macrosetae dorsally and 1 spur-like macroseta; tarsi with black setae. Abdomen ( Fig. 46 ). Black, mostly covered with white setae; lateral marginal macrosetae on tergite 1 white. Terminalia ( Figs 49–51 ). Black (except reddish brown apex of epandrium and gonostylus), white setose, some black setae present; epandrium with apex narrowed ( Fig. 50 ), rounded and strongly curved backwards, meeting opposite one ( Figs 49, 51 ); subepandrial sclerite conical ( Fig. 57 ); gonostylus short, curved and pointed posteriorly ( Figs 53–54 ); gonocoxite less sclerotized, broad and curved posteriorly, in area of insertion of gonostylus, sclerotized area with 2 macrosetae, 1 strongly thickened ( Figs 51–53 ); ejaculatory apodeme wide in lateral view, 1.5 times as long as phallus ( Fig. 55 ); hypandrium dome-like, posterior apex less projected, very thin and pointed ( Figs 51–53 ).

Female. Unknown.

Etymology. A masculine noun in apposition,from the Quechua language that refers to a concept of complementary dualism between opposites, present in any aspect of the existence in the Andean cosmovision.

Holotype condition. Good, terminalia dissected.

Taxonomic discussion. Ommatius yanantin sp. nov. can be differentiated from other species in the ampliatus group mainly by the black femora ( Figs 46–47 ); most anteroventral macrosetae of hind femur yellow ( Fig. 47 ); epandrium triangular ending in an angular process, rounded apically ( Fig 49–51 ); gonocoxite with 1 long, thick macroseta ( Fig. 51–53 ); and phallus narrowing apically ( Fig. 55 ). The most similar species is O. nanciae Vieira, 2015 which can be separated by the subrectangular subepandrial sclerite; hypandrium with distal apex rounded; gonostylus conic distally; ejaculatory apodeme with a dorsal keel and phallus straight to body axis. Additionally, in the male of Ommatius yanantin sp. nov., the vein C is dilated anteriorly ( Fig. 48 ) while in males of O. nanciae it is not dilated.

Distribution. Peru, Department of Cajamarca, Querocoto ( Fig. 66 ). The type locality corresponds to a Montane shrubland on the western slopes of the Andes. The only known specimen was collected in April.

Type material. Holotype: PERÚ: CA. Querocoto , La Iraca [Cerro Paja blanca], 2350 m. 6°21’38.55”S, 79°07’29.42”W iv.2021 I. Galindo / HOLOTYPE ♂ Ommatius yanantin Sánchez & Camargo (MUSM) .

Figures

FIGURE 66. Distribution map of Ommatius from the ampliatus species group in Peru.

FIGURES 46–52. Ommatius yanantin sp. nov. Male holotype. 46. Habitus, lateral view; 47. Hind femur, anterior view; 48. Wing; 49–51. Terminalia, dorsal, lateral and ventral views; 52. Drawing of hypandrium + gonocoxite and gonostylus + position of phallus, ventral view.

FIGURES 53–57. Ommatius yanantin sp. nov. Male holotype. 53–54. Hypandrium + gonocoxite and gonostylus, ventral and lateral views; 55. Phallus; 56. Cercus; 57. Subepandrial sclerite.