Glenoleon minutillus New, 1985

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 : 169-172

Glenoleon minutillus New, 1985

( Figs. 78 , 83–84 )

Glenoleon minutillus New, 1985b:41 (OD); New 1996:83 (cat); Stange 2004:104 (cat); Oswald 2018 (cat); Machado et al. 2019 (tree).

Diagnosis. Legs elongate; tibial spurs reaching T2 apex; forewing costal area uniareolate; forewing length ≤ 16mm; forewing with a large stigmal mark; hind wing lacking broad bands; wings rather narrow.

Description. Lengths: forewing: 11–15 mm; hind wing: 10–13 mm.

Head ( Figs. 83 a–b): Labrum pale; with a line of elongate setae. Clypeus pale; with some elongate setae. Frons predominantly black, except for ventral area orange (some specimens with a thin medial longitudinal black line on orange area); set with few pale setae. Gena pale. Vertex raised; in anterior view mostly pale to orange but with two small lateral transverse dark brown bands; in dorsal view mostly pale to orange with scattered dark brown marks centrally and posterolaterally; set with short black setae. Ocular setae absent. Antennae clubbed; elongate,> 2x length of pronotum; distance between antennae wider than scape width; scape and four to five subapical flagellomeres completely pale, pedicel and five to six apical flagellomeres entirely dark brown, remaining segments light brown with a dorsal pale ring, posterior face of these segments slightly darker than anterior surface; torular membrane pale; flagellomeres almost as long as wide at base, apical ones much wider than long; all segments set with short black setae. Mandibles mostly pale, with tip black. Palpi, maxillary and labial pale; except for some dark brown marks on basal segment of each palpi; apical labial palpomere fusiform, palpimacula opening oval-shaped, located medially.

Thorax ( Fig. 83b ): Pronotum longer than wide; posterior margin slightly wider than anterior; subapical furrow present; mostly pale to orange except for some dark brown marks as follows: a central large “Y” shaped, two curved and thin surrounding the central one, and margins; beset with short black setae with some long setae at margins. Mesonotum mostly pale to orange, with some small black areas as follows: two longitudinal bands around midline on prescutum, a long and curved transverse line with four short longitudinal lines on scutum, and anterior margin and midline of scutellum; covered with short black setae. Metanotum mostly black, with some pale to orange areas as follows: around midline on prescutum, rounded spots near wing base, and scutellum laterally; set with few short black setae. Pterothoracic pleura mostly black with some pale areas mainly on ventral sclerites; covered with white setae; Miller’s organ present.

Wings ( Fig. 83c ): Rather narrow with tip acute; anterior Banksian line present in both wings, posterior absent; veins mostly black, but some veins intercalated with pale spots, beset with short black setae. Male pilula axillaris present. Forewing membrane hyaline with brown marks mainly on posterior margin, tip and surrounding some crossveins, pterostigma with a large brown mark and tip white; CuA fork located between RP origin and first fork; most subcostal veinlets simple but some distal ones forked in some specimens; posterior area narrower than prefork area. Hind wing membrane hyaline but with brown marks and distal posterior margin, and base of hypostigmatic cell; MP fork located between RP origin and first fork; subcostal veinlets simple; one presectoral crossvein, with a medial spur.

Legs: All pairs of legs, femur elongate (> 3.5x length of coxa); tibia and femur about same size, but longer than tarsi; tibial spurs extending to T2 tip; T2, T3 and T4 about same size, T1 twice longer than T2, T5 twice longer than T1; claws about half of T5 length; coxa, trochanter and femur basal half set with white setae, remaining areas set whit short black setae and scattered long black setae; T5 ventrally with two rows of thick, long, black setae. Proleg sense hair absent; tibia with antennal cleaning setae ventroapically; coxa mostly dark brown with internal surface pale, trochanter light brown, femur with tip dark brown and a subapical ring pale, remaining areas light brown, tibia pale with three dark brown rings, T3, T4 and tip of T5 dark brown tarsi remaining areas pale. Mesoleg with same colour of proleg. Metaleg with femur, tibia and T1 slightly longer than in other legs; colour same of other legs except for tibia completely pale with tip and a ring near base, dark brown.

Abdomen: Segments mostly pale to orange with dark brown marks on posterior margins. Darker areas larger in sternites. Beset with short black or pale setae.

Male Terminalia ( Figs. 84 a–d): Ectoproct posterior margin rounded in lateral view, set with elongate black setae. 9 th sternite posterior margin concave, in ventral view; set with elongate black setae. Gonarcus broad, arched, with anterior margin rounded in lateral view. Mediuncus small and rounded in posterior view. Paramere large in lateral view with an apical concavity, and semi triangular in ventral view.

Female Terminalia ( Figs. 84 e–f): Ectoproct posterior margin rounded covered with thin elongate setae. Lateral gonapophyses rounded, smaller than ectoproct, set with some cavisetae. 7 th sternite distal margin straight in ventral view; covered with elongate black setae. Pregenital plate small, elongate with posterior margin rounded, anterior margin slightly wider and straight, in ventral view. Posterior gonapophyses broad and elongate; with the tip enlarged dorsally, covered with long black setae, and cavisetae at apex. 9 th tergite with a short membranous digitiform process. Anterior gonapophyses present, a small rounded plate covered with short pale setae. Ventral membrane, gonapophyseal plates present.

Distribution ( Fig. 78 ). Australia: NSW, SA. Known from scattered records in South Australia and adjacent New South Wales.

Adult activity period. Records for September to March.

Biology. Unknown, larva unknown.

Name-bearing type. Glenoleon minutillus : Holotype (by original designation), female, ANIC, examined. Type locality: Australia, New South Wales, 16 km N of Broken Hill (town). From original description: “ Holotype, ♀, New South Wales, 10 [miles] N. Broken Hill, 17.xi.1949, E.F. Riek ( ANIC)”. Condition: good.

Additional material examined (7♂, 10♀). AUSTRALIA: New South Wales: Broken Hill : near race track , 31.96445 oS– 141.41817 oE ± 70m, 280m, 2.i.2013, M.V., Oswald, Diehl & Machado, Oswald #625 (2♂, 3♀, TAMU) ; Glendambo : 16.i.2012, L. Stange (1♀, FSCA) ; 60 miles W of Wilcannia , 22.xi.1949, E.F. Riek (1♀ PT, ANIC) ; Northern Territory: Erldinda Station : x.1953 (1♀, SAMA) ; South Australia: Coward Spring : 9.xi.1966, G.F. Gross (1 ♀ PT, SAMA) ; ix.1966 (1♀, SAMA) ; Lake Eyre: N. Prescott Point , 2.ii.1965, McFarland & J. Mitchell (1♂, SAMA) ; Leigh Creek : 13.xii.1965 (1♀, SAMA) ; Levi Creek : 8 km NW of Big Perry Spring, 28’’19.2’S– 136’’16.1’E, 7.xii.1974, J.A. Horridge (1 ♂ PT, SAMA) ; Maree : 28.x.1972 (1♂, SAMA) ; Muloorina Station : 3.iii.1966, N. McFarland (1 ♂ PT, 1♀, SAMA) ; Mutooroo Homestead : 30.i.1972 (1♂, SAMA) .

Comments. Glenoleon minutillus is very similar to most of its congeneric species, as confirmed by both molecular ( Machado et al. 2019) and morphological ( Fig. 4 ) phylogenetic data. In many respects G. minutillus looks like a smaller version of G. aurora , but the two species can be distinguished by the shape of the wings and the male terminalia.

Figures

FIGURE 4. Strict consensus tree of morphology-based parsimony analysis of species belonging to the former subtribe Periclystina (ingroup, names in black), and outgroups (names in red). Former Glenoleon species are shown on blue branches, former Austrogymnocnemia species on green branches. Numbers above branches are Bremer support values; numbers below branches are bootstrap values (shown where>50%).

FIGURE 78. Distribution of Glenoleon species (part).

FIGURE 83. Glenoleon minutillus: a) head, anterior; b) head and thorax, dorsal; c) wings, dorsal.

FIGURE 84. Glenoleon minutillus: male: a) terminalia, lateral; b) genitalia, lateral; c) genitalia, posterior; d) genitalia, ventral; female: e) terminalia, lateral; f) 7th sternite and pregenital plate, ventral. Scale bars = 0.5 mm.