Zorotypus impolitus Mashimo, Engel, Dallai, Beutel, & Machida, sp. n.

(Figs. 3, 4, 8)

Type series. Holotype, apteron male, MALAYSIA: Selangor, Ul Gombak (elevation ca. 200–400 m), 10 April 2011, coll. Y. Mashimo & R. Machida (UKM). Paratypes, 3 apteron males, 3 apteron females, 1 alate female, same data as holotype (SEHU, SMRC, UKM). Apteron and alate specimens were collected under the bark of rotting wood.

Diagnosis. This species is similar to Z. sinensis and Z. medoensis but can be distinguished from them by the following: body size distinctly smaller, 2 mm vs. 3–4 mm; long stout bristles on ventral surface of metafemur, proximal 1st and 3rd bristles longer than others vs. more distad bristles shorter; male S8 without posterior extension of posteromedial part; and in the shape of the male genitalia (cf. Hwang 1976: Figs. 3–6).

Etymology. The specific epithet is based on the Latin impolitus, referring to the unpolished brown coloration of the body.

Description. Apteron male. Body length ca. 2 mm (exclusive of antennae), color matte brown except membranous regions and yellowish white cercus; head subtriangular, slightly wider than pronotum, with whitish area in posterolateral corner; cephalic chaetotaxy as in Figure 3 A, curly setae grouped on vertex (likely associated with fontanelle gland as in males of some other species); compound eyes and ocelli absent; antennae 9-segmented, distal three antennomeres paler (Fig. 8 A), antennomere I slightly curved outward, antennomere II faintly curved, short, about one-half length of antennomere III, antennomeres III–IX longer than wide, length subequal to that of antennomere I (Fig. 8 A); both mandibles with five apical teeth and well-developed molar region (Fig. 8 B, B’). Pronotum subrectangular, slightly narrowed posteriorly; mesonotum trapezoidal, slightly shorter than pronotum; metanotum trapezoidal, distinctly wider than long, shorter than mesonotum; thorax setose as in Figure 3 B. Legs with moderate-length setae; tibiae and tarsi of all legs paler in color; posterior surface of profemur covered with short setae, anterior and dorsal surfaces covered with moderate-length setae; protibia with moderate-length setae, bristles arranged as comb in distal half along ventral surface, with two apical spurs; mesofemur slightly narrower than profemur, anterior surface broadly setose, posterior and dorsal surfaces covered with moderate-length setae only distally; mesotibia covered with moderate-length setae and two apical spurs; metafemur broader than profemur, more swollen proximally than distally as in Figure 8 D, anterior surface broadly setose, posterior and dorsal surfaces with moderate-length setae on distal half and several short setae on proximal half, ventral surface with eight or nine stout bristles, proximal first and third bristles longer than others (Fig. 8 D); metatibia with moderate-length setae and two apical spurs. Abdominal tergal chaetotaxy as in Figure 3 D; T1 with a single transverse row of short setae, and a few small setae laterally (Fig. 3 D); T2–7 with regular vestiture of numerous setae of short and moderate length and a pair of longer setae along posterior margin (Fig. 3 D); T8 with numerous fine, small setae, three pairs of moderate-length setae and a pair of long, erect setae (Figs. 3 D, 4B); T9 short, scarcely sclerotized (Figs. 3 D, 4C); anterior half of T10 sclerotized, posterior half membranous; with numerous fine, small setae and median spatula-like, upcurved projection (Figs. 3 D, 4B; asterisk in Fig. 4 C); T11with long and strongly upcurved median projection and two smaller, lateral sclerites each bearing three or four moderate-length setae (Figs. 3 D, 4B; star in Fig. 4 C); epiproct and paraproct unsclerotized (Fig. 4 B); cercus unsegmented, conical, with one long apical seta, three or four subapical moderate-length setae, several short setae, and very long and fine setae (Fig. 3 D), surface covered with numerous minute spicules except base and apex (too minute to be included in drawing); chaetotaxy of sterna as in Figure 4 A; S1 scarcely sclerotized; S2 weakly sclerotized with two or three short setae on each side (Fig. 4 A); S3–4 with two transverse rows of short setae (Fig. 4 A); S5 with short setae evenly scattered and a pair of scarcely sclerotized circular areas (Fig. 4 A); S6–7 with evenly scattered short setae (Fig. 4 A); S8 wider than long, with evenly scattered, moderate-length setae (Fig. 4 A) and a pair of longer setae (Fig. 4 B); S9 fused to S8; S10 invaginated beneath S8+9, not visible externally; S11 with two lateral subtriangular sclerites (hemitergites), each with several setae of short and moderate length (Fig. 4 B). Genitalia asymmetrical, without elongate coiled flagellum and well defined basal plate; dorsal sclerite weakly sclerotized, with anterior end curved; middle sclerite twisted and curved; spatula-like ventral sclerite present beneath middle sclerite (Fig. 8 E).

Apteron female. Generally as in male except as follows: Head without curly setae grouped on vertex. Abdominal T10 uniformly sclerotized with four or five setae on each side and a pair of setae of moderate length (Fig. 4 E); T11 uniformly sclerotized, with small setae and a pair of setae of moderate length (Fig. 4 E); S8 and 9 not fused; S8 wider than long, with short setae evenly scattered and two pairs of moderate-length setae, posteromedially with round membranous region (Fig. 4 D); S9 short and trapezoidal; several small setae and two pairs of moderate-length setae along posterior margin (Fig. 4 D).

Alate. General features as in apterous form except as follows: unpolished, blackish brown coloration. Compound eyes and three black ocelli present. Mesonotum indistinctly divided into slightly pointed prescutum, large mesoscutum, and smaller mesoscutellum (Fig. 3 C). Wings as in Figs. 8 C and 8C’.