Latileon setosus Machado, 2020

Machado, Renato Jose Pires & Oswald, John David, 2020, Morphological phylogeny and taxonomic revision of the former antlion subtribe Periclystina (Neuroptera: Myrmeleontidae: Dendroleontinae), Zootaxa 4796 (1), pp. 1-322 : 69-72

Latileon setosus Machado , new species

( Figs. 19 , 26–27 )

http://zoobank.org/NomenclaturalActs/ B7855647-F512-4F05-9FB0-A5579CDD5632

Diagnosis. Proleg with a line of long white setae; body mostly pale; forewing membrane with a brown line surrounding the gradate crossveins.

Description. Lengths: forewing: 15–18 mm; hind wing: 13–16 mm.

Head ( Figs. 26 a–b): Labrum pale, set with a line of elongate setae. Clypeus pale, beset with elongate pale setae. Frons pale with a large transverse dark brown band around antennae, brown area with a thin transverse pale line above antennae (some specimens with ventral margin of brown line with a medial invagination); beset with small white setae. Gena pale. Vertex weakly raised; in anterior view pale with two short transverse dark brown marks laterally and a rounded central dark spot; in dorsal view mostly pale with scattered brown marks, and a central rounded mark on posterior margin; set with few short white setae on anterior view and black ones in dorsal view. Ocular setae white and long (short in few specimens). Antennae clubbed; elongate, about three times longer than pronotum; distance between antennae about as wide as scape width; scape pale; pedicel pale anteriorly, brown posteriorly; most flagellomeres pale with dorsal margin brown, few subapical segments entirely brown and apical segments with anterior surface pale and posterior surface brown; torular membrane pale; flagellomeres almost as long as wide at base, apical ones much wider than long; flagellum set with short black setae, scape and pedicel set with short white setae. Mandible pale with tip dark. Palpi, maxillary and labial pale; apical labial palpomere fusiform, palpimacula opening oval-shaped, located medially.

Thorax ( Fig. 26b ): Pronotum slightly wider than long; posterior margin wider than anterior; subapical furrow present; mostly pale except for a broad sagittal brown line, some specimens with a thin central pale line at anterior area; set with long white setae, and scattered black setae. Mesonotum with prescutum dark brown except for pale lateral margins; scutum mostly dark brown with two longitudinal lines near central area, and margins pale; scutellum pale with a sagittal dark brown line; covered with short white setae, and few black flattened setae at scutum. Metanotum with prescutum pale with two brown marks near central area, scutum dark brown with two longitudinal pale lines near center, scutellum dark brown with pale margins; set with few short white setae. Pterothoracic pleura mostly dark brown with some irregular pale areas near margins; covered with white setae; Miller’s organ absent.

Wings ( Fig. 26c ): Fairly broad; Banksian lines absent; veins mostly brown, but some veins intercalated with pale areas, beset with short black setae. Forewing membrane mostly hyaline except for a small weak brown spot at end of prefork area and a brown line surrounding some gradate crossveins; some specimens with few marks on mediocubital area; pterostigma pale with small brown mark at base; CuA fork located between RP origin and first fork; three presectoral crossveins; basal subcostal veinlets simple but with few forked in distal half; prefork area slightly larger than posterior area (about the same size in few specimens). Hind wing membrane hyaline; MP fork located between RP origin and first fork; subcostal veinlets simple; two presectoral crossveins.

Legs ( Fig. 26a ): All pairs of legs, femur short (<2x length of coxa); tibia slightly shorter than femur but slightly longer than tarsi; tibial spurs arched and long, extending over T4 apex; T2, T3 and T4 about the same size, T1 slightly longer than T2, T5 about the same size of T1–T4 combined; claws about half of T5 length. Proleg sense hair longer than femur length; coxa pale with brown marks on external surface, covered with short white setae and a line of long curved white setae on external surface; trochanter pale with short white setae; femur very broad, pale except for dorsal apex, brown and scattered small brown marks, covered with short black and long curved white setae; tibia with antennal cleaning setae in most of ventral surface, pale except for tip and a sub basal brown mark on dorsal surface, covered with short and long black setae and few long white setae; tarsi pale except by most part of T5, brown; all tarsomeres covered with short black setae and long black setae ventrally. Mesoleg similar to proleg, except with narrower femur. Metaleg similar to mesoleg except with femur and tibia slightly longer, without sub basal brown mark on tibia, and sense hair absent.

Abdomen: All segments dark brown, but tergites with lateral pale marks on basal half, and sternites with central pale marks. All segments covered with short black setae.

Male Terminalia ( Figs. 27 a–c): Ectoproct posterior margin rounded in lateral view; set with elongate black setae, mainly at ventral area. 9 th Sternite short, with posterior margin rounded in ventral view; covered with long black setae. Gonarcus thin, an arched bar in posterior view; and small and curved in lateral view. Mediuncus membranous. Paramere rectangular in posterior view, with tip more sclerotized; in lateral view vertically extended and with posterior margin rounded.

Female Terminalia ( Figs. 27 d–e): Ectoproct posterior margin rounded, set with thin elongate setae and some elongate cavisetae ventrally. Lateral gonapophyses rounded, slightly smaller than ectoproct, with some elongate cavisetae apically. 7 th sternite long; distal border straight in ventral view; covered with short setae. Pregenital plate weakly sclerotized, small, diamond shaped in ventral view. Posterior gonapophyses short and digitiform, beset with very long black setae; tip rounded. 9 th tergite without membranous digitiform process. Anterior gonapophyses absent. Ventral membrane, gonapophyseal plates present.

Distribution ( Fig. 19 ). Australia: WA. Known from sparse records in western Western Australia. Existing records suggest that L. setosus may be allopatrically distributed relative to its sister species L. hyalinus .

Adult activity period. Records for December and February to April.

Biology. Unknown, larva unknown.

Etymology. setosus (from Latin setosus, bristly), in reference to the long setae on the profemur.

Name-bearing type. Latileon setosus : Holotype (by present designation), male, ANIC. AUSTRALIA: Western Australia: 8 km SW by W of Cane R. HS., WA. 22.07S– 115.33E, 31.Mar.1971, E.F. Riek (1♂ ANIC). Condi- tion: pinned, good, left antenna missing; terminalia dissected and stored in glycerin in a microvial pinned below the specimen.

Paratypes (1♂, 7♀). AUSTRALIA: Western Australia: 8 km SW by W of Cane River Homestead, 22.07S– 115.33E, 31.iii.1971, E.F. Riek (5♀, ANIC, pinned); Highway 136, 13 air km NENE of Nanutarra Roadhouse, 22.47124 oS– 115.60040 oE ± 70m, 22.xii.2012, M.V., Oswald, Diehl & Machado, Oswald #614 (1♂, TAMU, 100% ETOH); Narrogin: 1.iv.1970, P. Holbeach (1♀, MVM, pinned); Whim Creek Hotel: 20 o 50’26.6’’S– 117 o 56’4.7’’E, 27.ii.1994, R. Miller & L. Stange (1♀, FSCA, pinned) .

Comments. Latileon setosus sp. nov. was included in the molecular phylogeny of Machado et al. (2019) as “ Fusoleon sp.”. For additional comments see L. hyalinus .

Figures

FIGURE 19. Distribution of Franzenia, Fusoleon and Latileon species.

FIGURE 26. Latileon setosus sp. nov.: a) head, anterior; b) head and thorax, dorsal; c) wings, dorsal.

FIGURE 27. Latileon setosus sp. nov.: male: a) terminalia, lateral; b) genitalia, lateral; c) genitalia, posteroventral; female: d) terminalia, lateral; e) terminalia, ventral. Scale bars = 0.5 mm.