Amplicephalus (Nanctasus) anayensis

Duan, Yani & Dietrich, Christopher H., 2018, Notes on the Neotropical leafhopper subgenus Amplicephalus (Nanctasus) Linnavuori (Hemiptera: Cicadellidae: Deltocephalinae: Deltocephalini) with description of two new species, Zootaxa 4455 (3), pp. 555-562: 556-557

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Amplicephalus (Nanctasus) anayensis

sp. n.

Amplicephalus (Nanctasus) anayensis  sp. n.

( Figs 1–3View FIGURE 1View FIGURE 2View FIGURE 3)

Length. Male: 3.4–3.7 mm; female 3.8 mm.

Coloration and morphology. Nearly uniformly pale stramineous with indistinct yellow markings on head, pronotum, and mesonotum ( Fig. 1A–B View Figure ). Face mostly pale stramineous, with paired white marks ( Fig. 1C View Figure ). Abdominal sternites variably infused with dark brown. Femora and tibiae with dark brown marks ( Fig. 1B–C View Figure ).

Head wider than pronotum, anterior margin acutely angulate in dorsal view ( Fig. 1A View Figure ). Crown slightly longer medially than distance between eyes ( Fig. 1A View Figure ). Anteclypeus tapering apically, extended outer margin of gena. Lorum ovoid, slightly narrower than anteclypeus, well separated from lateral margin of face ( Fig. 1C View Figure ). Pronotum much shorter than crown ( Fig. 1A View Figure ). Forewing extended to or beyond apex of abdomen in both sexes, with a few extra crossveins ( Fig. 1A–B View Figure ).

Male genitalia. Pygofer lobe apex obliquely truncate, with numerous macrosetae in distal half ( Fig. 2A–B View Figure ). Valve broadly rounded caudally ( Fig. 2C View Figure ). Subgenital plate triangular, lateral margin nearly straight with macrosetae arising laterally ( Fig. 2C View Figure ). Style with articulatory arm long; preapical lobe acutely angulate; apophysis finger-like, nearly straight ( Fig. 2D View Figure ). Connective much shorter than aedeagus. Aedeagus apex with V-shaped emargination apically, sinuate in lateral view, arched dorsad in basal half then curved dorsad distally, dorsal hood at base well developed ( Fig. 2D–E View Figure ).

Female. Sternite VII with posterior margin weakly trilobed, medial lobe longest ( Fig. 3E View Figure ). Sternite VIII partially sclerotized, folded dorsad of sternite VII at rest, with pair of dark V-shaped median markings, one behind other, concealed but partly visible through integument of sternite VII as dark internal areas in uncleared specimens ( Fig. 3E View Figure ). First valvula with dorsal sculpturing imbricate, merging with short strigate ventral sculptured area distally ( Fig. 3A–B View Figure ). Second valvula moderately slender and nearly same width through most of length, dorsal margin with several small irregularly spaced teeth alternating between sides, toothed section slightly convex, apex gradually and evenly tapered to acute point ( Fig. 3C–D View Figure ).

Material examined. Holotype: ♂, Chile: Araucania, P.N. Nahuelbuta, Cerro Anay road, 1250 m, 37.80187°S, 73.01419°W, 18 Jan 2014, C.H. Dietrich, vacuum, grasses, CL 14–21–1 (MNC)GoogleMaps  . Paratypes: 1♂, 2♀, same data with holotype ( INHSAbout INHS)GoogleMaps  .

Etymology. The species epithet is based on that of the type locality.

Remarks. This species is readily separated from other species of A. ( Nanctasus  ) by the relatively small size, pale overall coloration without distinct darker markings on the dorsum, and by the shape of the aedeagus and female sternite VII. It differs from other A. ( Nanctasus  ) species in the smaller size and more acutely produced head and is only tentatively included in this subgenus based on the presence of a membranous dorsal hood at the base of the aedeagal shaft and the few extra crossveins in the forewing (see Discussion below).


Illinois Natural History Survey