Latileon hyalinus 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 : 66-67

Latileon hyalinus Machado , new species

( Figs. 19 , 24–25 )

http://zoobank.org/NomenclaturalActs/ E 110141 B-D5B8-402B-A3FD-31D4B6BC3970

Diagnosis. Body mostly pale; forewing membrane hyaline; forewing posterior area wider than prefork area.

Description. Lengths: forewing: 17–19 mm; hind wing: 15–17 mm.

Head ( Figs. 24 a–b): Labrum pale, with a line of elongate setae. Clypeus pale, beset with elongate pale setae. Frons pale except for area circling antennae, dark brown; 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 two dark medial perpendicular lines, and a central rounded mark on posterior margin; set with short black setae. Ocular setae absent. Antennae clubbed; elongate,> 2x length of pronotum; distance between antennae about as wide as scape; scape pale; pedicel pale anteriorly, brown posteriorly; most flagellomeres similar to pedicel, but central segments are almost entirely brown and few subapical segments are partially pale posteriorly; 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. 24b ): Pronotum slightly wider than long; posterior margin as wide as anterior; subapical furrow present; mostly pale except for some brown areas: lateral margins, two curved longitudinal lines and four rounded marks around central line (two before furrow and two after); set with black setae, and few longer white setae on margins. Mesonotum mostly pale, except for some brown areas: two rounded central marks on prescutum, central and lateral areas of scutum, posterior margin of scutellum; covered with short black setae. Metanotum mostly pale, except for two longitudinal brown lines surrounding the central line and two lateral longitudinal at scutum; set with few short black setae. Pterothoracic pleura mostly pale with some irregular brown areas mainly on anterior segments; covered with short white setae; Miller’s organ absent.

Wings ( Fig. 24c ): Fairly broad; Banksian lines absent; veins mostly brown, but some veins intercalated with pale areas, beset with short black setae. Forewing membrane hyaline with a weak rhegmal spot; pterostigma pale; CuA fork located between RP origin and first fork; three presectoral crossveins; basal subcostal veinlets simple but mostly forked in distal half; posterior area wider than prefork area. Hind wing membrane hyaline; MP fork located between RP origin and first fork; subcostal veinlets simple; one presectoral crossvein.

Legs ( Figs. 24 a–b): All pairs of legs, femur <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 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, set with scattered white setae; trochanter pale with short black setae; femur swollen, much wider than tibia, pale except for dorsal apex, brown; covered with short black setae and scattered long white setae; tibia with a patch antennal cleaning setae in most of ventral surface, pale except by tip and a sub basal brown mark on dorsal surface, covered with short and some long black setae; tarsi mostly brown except by basal half of T5, pale; all tarsomeres covered with short, black setae and long, black setae ventrally. Mesoleg similar to proleg, except for femur, narrower. Metaleg similar to mesoleg except with femur and tibia slightly longer, and tibia without a sub basal brown mark; sense hair absent.

Abdomen: Tergite 1 pale; tergite 2 brown; remaining tergites pale on basal half and brown on apical half. All sternites pale except for few irregular brown marks (mainly basal sternites). All segments covered with short black setae.

Male Terminalia: Unknown.

Female Terminalia ( Figs. 25 a–b): Ectoproct posterior margin rounded, set with thin elongate setae and few short cavisetae ventrally. Lateral gonapophyses rounded, slightly smaller than ectoproct, set with some elongate cavisetae apically. 7 th sternite long, with distal border straight in ventral view; covered with short setae. Pregenital plate weakly sclerotized, a small inverse triangle in ventral view. Posterior gonapophyses stout, beset with long black setae, tip rounded and thinner than base. 9 th tergite without membranous digitiform process. Anterior gonapophyses absent. Ventral membrane gonapophyseal plates present.

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

Adult activity period. Records for October.

Biology. Unknown, larva unknown.

Etymology. hyalinus (from Latin hyalinus, transparent or glassy), in reference to the hyaline wings.

Name-bearing type. Latileon hyalinus : Holotype (by present designation), female, ANIC. AUSTRALIA: Northern Territory: 14.19S– 132.25E, Katherine Gorge, N.T., 24 km NE of Katherine, 16.Oct.1972, M.S. Upton (1♀, ANIC, pinned). Condition: pinned, perfect, no parts missing.

Paratype (1♀). AUSTRALIA: Northern Territory: Cattle Creek : 54 km S by W of Borroloola, 16.32S– 136.10E, 27.x.1975, J.C. Cardale ( ANIC, pinned) .

Comments. Latileon hyalinus sp. nov. can be distinguished from L. setosus sp. nov. by the following characters (in L. hyalinus ): forewing membrane hyaline, fewer white setae on thorax, wings slightly broader, female posterior gonapophyses shorter. For phylogenetic relationships see Fig. 4 .

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 19. Distribution of Franzenia, Fusoleon and Latileon species.

FIGURE 24. Latileon hyalinus sp. nov.: a) head, anterior; b) head and thorax, dorsal; c) wings, dorsal.

FIGURE 25. Latileon hyalinus sp. nov.: female: a) terminalia, lateral; b) terminalia, ventral. Scale bars = 0.5 mm.