Bifurcatoaptera lamdongensis, Bai & Heiss & Cai, 2018

Bai, Xiaoshuan, Heiss, Ernst & Cai, Wanzhi, 2018, Aradidae from Vietnam V. Bifurcatoaptera, a new genus of apterous Carventinae (Hemiptera: Heteroptera: Aradidae) from Vietnam, Zootaxa 4450 (2), pp. 286-290 : 287-290

Bifurcatoaptera lamdongensis sp. nov. ( Figs. 1 –17)

Type material. Holotype: ♂, labelled: “ Vietnam, Lamdong Pro. / Dalat , 1500m, N 12°30', E 108°25' / 5. VII. 2011, Pham leg.” ( IMNU) . Paratypes: “ Vietnam, Lamdong Pro. / Dalat , 1500m, N 12°30', E 108°25' / 24. IX. 2011, Bai, Pham leg.” (♀, IMNU); “ Vietnam . Vinphuc. Pro. / Melinh , 200m / N 21°18’, E 105°47’ / 2. 2011 Bai, Pham / Ent. Mus. IMNU Huhhot ” (♀, CEHI). These specimens are provided with type labels accordingly.

Description of male. Head. Longer than wide across eyes (0.93/0.80); genae slightly notched anteriorly, reaching basal one-third of first antennal segment; clypeus strongly raised anteriorly, with a tubercle near apex; antenniferous tubercles short, dilated, apices acute; eyes small and convex; postocular tubercles small, conical and not reaching outer margin of eyes, postocular borders strongly constricted posteriorly; vertex with granulate carinae flanked by a pair of large, ovate infraocular callosities; antennae 2.5 times as long as width of head across eyes, relative length of antennal segments I to IV= 0.6/0.3/0.73/0.33; rostrum short, rostral groove wide, deep and closed posteriorly.

Pronotum 2.69 times as wide as long (1.43/0.53), attenuated anteriorly; collar thick, as wide as first antennal segment (1.67/1.67); anterolateral angles not produced beyond collar, subangular; disc with a median sulcus, flanked by a pair of subtriangular plates which meet at anterior margin and lateral ovate plates with irregular granulate carinae and conical tubercles; posterior margin of pronotum slightly convex, separated from mesonotum by a deep furrow.

Mesonotum. Wider than pronotum (1.90/1.43); separated from metanotum by a pair of very deep furrows laterally; with a median elongate ridge extending over metanotum and fused mtg I+II, attenuated and rounded anteriorly, laterally flanked by deep furrows and smooth ovate and subrectangular plates with irregular carinae, the lateral margins granulate.

Metanotum, mtg I+II. Metanotum wider than mesonotum (2.13/1.90); structure of median ridge and lateral sclerites as of mesonotum; this median ridge spreads into two oblique ridges on mtg I+II reaching to posterior margin of mtg II, leaving a triangular depression between them, laterally flanked by rugose plates.

Abdomen. Tergal plate consisting of mtg III to VI, subquadrangular; anterior and posterior margins truncate, lateral borders slightly rounded; median elevation highest and widest on mtg III, sloping on tergum IV, prolonged to terga V and VI; dorsal scent gland openings small but distinct; laterad of median ridge with a usual pattern of large and small callous spots; deltg II–III completely fused, III–VII separated by fine sulci; dorsally reflexed vltg II–VII forming the progressively protruding posterolateral angles of deltg II to VII, deltg VII with rectangular lobes; spiracles II to III ventral, IV to VII lateral on reflexed vltg IV–VII and visible from above, VIII terminal.

Genitalia. Pygophore cordate (Figs. 13, 14), paratergites VIII clavate, reaching basal two-thirds of pygophore; right paramere slender (Figs. 15–17).

Venter. Sterna III to VI raising along posterior border, depressed along anterior border with subtriangular, smooth spots medially, flanked by a pair of large, transversely ovate shallow depressions, these bearing a pair of round callous spots and more laterad two pairs of smaller round callous spots.

PHOTOS 5–17. Bifurcatoaptera lamdongensis sp. nov. 5–12, body structures. 5, 6, 8, 9, holotype male; 7, 10, 11, 12, paratype female; 5, 7, 8, 10, dorsal view; 6, 9, 11, 12, ventral view; 13–14, pygophore in dorsal and lateral views; 15–17, right paramere. Scale bar = 0.5 mm for 5–14; 0.1 mm for 15–17.

Legs. Slender, preapical comb on fore tibia present, claws with fine pulvilli.

Female. Morphological features similar to male. Head longer than wide across eyes (0.93/0.8); length of antennal segments I to IV= 0.6/0.3/0.73/0.33; pronotum wider than long (1.4/0.5); width of mesonotum 1.77; width of metanotum 2.0; mtg VII slightly elevated posteriorly, paratergites VIII dentiform, reaching to basal three-fourth of tergum IX.

Measurements [in mm, ♂ (n=1)/ ♀ (n=1)]. Body length 5.30/5.20; maximal width of abdomen 2.40/2.45. Length head 0.93/0.95; width 0.80/0.80. Length pronotum 0.53/0.50; width 1.43/1.40. Mesonotum width 1.90/1.77. Metanotum width 2.13/2.00. Length of antennal segments I–IV = 0.60, 0.30, 0.73, 0.33 / 0.60, 0.30, 0.73, 0.33.

Etymology. The species name refers to the type locality.

Distribution. Vietnam, so far only recorded from Lamdong and Vinphuc Provinces.

Figures

FIGURES 1–4. Bifurcatoaptera lamdongensis sp. nov. 1–2, holotype male; 3–4, paratype female. 1, 3, dorsal view; 2, 4, ventral view. Scale bar = 1 mm.