Zorotypus asymmetricus Kocarek

Kočárek, Petr, Wahab, Rodzay Abdul & Kahar, Siti Rafhiah Abdul, 2017, Zorotypus asymmetricus sp. nov. from Brunei Darussalam, Borneo (Insecta: Zoraptera), Zootaxa 4286 (2), pp. 285-290 : 286-289

Zorotypus asymmetricus Kocarek , sp. nov.

( Figs. 1‒17 )

Type material. Holotype apterous male, labelled ' Brunei Darussalam, 9.i.2014, Ulu Temburong NP, Sungai Esu stream, 150 m a.s.l., GPS: 04°32'14.1"N, 115° 9'47.1"E, P. Kočárek leg.' ( NMPC), under bark of rotting log . Paratypes: same data as for holotype, 1 apterous female ( NMPC), 1 apterous male, 1 apterous female ( UBDC), 1 apterous male, 1 apterous female ( BMNH), 3 apterous males, 4 apterous females ( PKCO) .

Diagnosis. The new species is similar to Z. sinensis Hwang, 1974 , Z. medoensis Hwang 1976 , Z. impolitus Mashimo, Engel, Dallai, Beutel & Machida 2013 and Z. weiwei ( Hwang 1974, 1976; Mashimo 2013; Wang et al. 2016), but it can be easily distinguished from them by the asymmetrical cerci, with the right cercus noticeably enlarged and sickle-shaped ( Figs. 9–11 ), the species-specific shape of the male genitalia ( Fig. 13 ), and the presence of 7‒8 stout, long spines on the ventral surface of metafemur. The body is typically matte dark brown with the exception of pale yellowish gray tibiae and tarsi on all legs and antennomeres VI‒IX.

Description of apterous male ( Figs. 1‒4, 6, 7 , 9‒13 , 17 ). Total body length 2.39 mm, head width 0.43 mm, antenna length 1.45 mm, pronotal width 0.41 mm, pronotal length 0.36 mm, metafemur length 0.644 mm. Body color matte dark brown except membranous regions; antennal flagellomeres VI‒IX and tibiae and tarsi of all legs pale yellowish gray ( Figs. 1 , 17 ). Head subtriangular, slightly wider than pronotum ( Figs. 2, 3 ); cephalic setae ( Fig. 2 ) short and sparse, not grouped; compound eyes and ocelli absent; antennae 9-segmented, distal four antennomeres paler ( Figs. 1, 6 ), antennomere I slightly curved outward, antennomere II slightly curved, short, about one-half length of antennomere III, antennomeres III–IX longer than wide, length subequal to that of antennomere I ( Fig. 6 ). Mandibles asymmetrical, each mandible with four apical teeth and well-developed molar region ( Fig. 4 ); maxillary palpus five-segmented, labial palpus three-segmented. Pronotum subrectangular, only slightly wider than long, slightly narrowed posteriorly and setose ( Fig. 2 ); mesonotum trapezoidal, slightly shorter than pronotum; metanotum trapezoidal, distinctly wider than long, shorter than mesonotum. Legs with short setae; tibiae and tarsi of all legs pale yellowish gray ( Fig. 1 ); posterior surface of profemur covered with short setae, anterior and dorsal surfaces covered with longer setae; protibia with short setae, spines arranged as comb in distal two-thirds along ventral surface, with two apical spurs; mesofemur slightly narrower than profemur, anterior surface broadly setose, posterior and dorsal surfaces covered with setae only distally; mesotibia covered with short setae and two apical spurs; metafemur broader than profemur, swollen proximally ( Figs. 7, 8 ), anterior surface broadly setose, posterior surface sparsely setose, middle part without setae, distal half of lower edge lined with one row of longer setae ( Figs. 7 , 9 ), ventral surface with 7‒8 stout spines, proximal first and second spines (spine I and II) longer than others ( Fig. 7 ), distance between spine I and II and between spines II and II equal to length of spines 1 and 2; spines III‒VIII shorter and closer to each other ( Fig. 7 ); metatibia with short setae, subapically with one strong spine ventrally and one finer spine dorsally; basal tarsomere with stronger two spurs ventrally ( Figs. 7 , 9 ).

Abdominal tergite 1 (T1) with single transverse row of setae flanking distal edge, and one pair of short setae in antero-posterior margin; T2 with two parallel rows of setae in distal third of the tergite with regular distances between individual setae; T3 with three irregular rows of setae in distal half; T4‒5 with 4‒5 irregular rows of setae filling distal half of the tergite, setae in the most distal row longer; T6‒7 with 6‒7 irregular rows of setae occupying two-thirds of the tergite, setae in the most distal row longer; T8 with 4 irregular rows of setae in posterior half of tergite and with ten longer setae on the posterior edge ( Fig. 10 ); T9 short, strongly sclerotized anteriorly and scarcely sclerotized posteriorly, well delimited from T 10 in the middle, but fused with T 10 in lateral fifths ( Fig. 10 ); T10 separated into anterior and posterior parts, anterior part scarcely sclerotized, with setae laterally, posterior half strongly sclerotized with medial spatula-like upcurved projection, several short setae on the base of projection and two short setae on the obtuse top ( Fig. 10 ); T11 with long and strongly upcurved median projection with a tiny apical hook ( Fig. 10 ) and two smaller, lateral sclerites each bearing two longer setae; projection of T11 narrower in the middle and longer than that of T10 ( Fig. 10 ); epiproct and paraproct unsclerotized.

Cerci ( Figs. 9‒11 ) unsegmented, left cercus conical with pointed apex, right cercus enlarged with sickleshaped, pointed appendage terminating in one larger apical tooth and one smaller subapical tooth on outer margin; right cercus with two long distal setae, the the more apical seta longer than and extending past distal tooth ( Fig. 11 ). Outer basal margin of both cerci with short setae and several long and fine setae ( Figs. 9‒10 ); surface covered with numerous minute spicules except base and apex; pointed appendage of right cercus without spicules.

Abdominal sternite 1 (S1) scarcely sclerotized; S2 weakly sclerotized with a few short setae on each side and four setae in the middle posterior margin; S3 with two irregular parallel rows of short setae in distal third of the sternite; S4 with three irregular rows of short setae in distal half; S5 with four irregular rows of short setae occupying posterior two-thirds of the sternite; S6 with five irregular rows of short setae occupying all but anterior fourth; S7 with 4‒5 irregular rows of short setae on posterior two-thirds; S8 and S9 fused ( Fig. 12 ), with shallow, partly visible furrow, S8 with evenly scattered fine setae, posterior margin with moderate-length to long setae, S9 asymmetrical with two posterior lobes, left lobe more prominent, each lobe with one row of strong setae; S10 invaginated beneath S8+S9, not visible externally; sternite S11 with two lateral sclerites, each with one row of small setae.

Genitalia asymmetrical, with hooked and strongly sclerotized aedeagus, without elongate coiled flagellum; spatula-like basal plate present beneath aedeagus ( Fig. 13 ).

Apterous female. Generally as in male except as follows: pronotum transverse, apparently wider than long and only slightly narrowed posteriorly ( Fig. 5 ); metafemur slender, ventral surface with 7 stout spines, thinner than in males, proximal first and second spines longer than others, but the distance between them twice the length of spines 1 and 2; distance between second and third bristles equal to length of spine 2 ( Fig. 8 ); Abdominal T10 uniformly sclerotized with 6‒8 short setae on each side and a pair of longer setae ( Fig. 14 ); T11 trapezoidal, weakly sclerotized at distal end, with small setae laterally and one pair of longer setae ( Fig. 14 ); both cerci short, conical with slightly pointed distal apex, surface covered with numerous minute spicules except on base and apex, and shorter and longer setae ( Fig. 14 ); S8 strongly trapezoidal, wider than long, with short setae evenly scattered and longer setae flanking the distal and lateral edges; distal end slightly concave with peg-like projection in the middle ( Fig. 16 ); S9 short and trapezoidal with several small setae along posterior margin ( Fig. 15 ).

Alate males and females. Unknown.

Etymology. The name refers to the asymmetrical cerci and asymmetrical abdominal sternite S 9 in males.

Distribution and occupied habitat. Zorotypus asymmetricus sp. nov. was collected under the bark of rotting logs in shade in the valley of Sungai Esu stream ( Fig. 18 ). The species is currently known only from Ulu Temburong National Park in Brunei Darussalam, but we expect its occurrence in similar habitats throughout Borneo.

Figures

FIGURES 1 – 8. Zorotypus asymmetricus sp. nov. 1, male habitus of living specimen; 2, head and pronotum of apterous male, dorsal view; 3, head of apterous male, ventral view; 4, left mandible of male; 5, pronotum of apterous female, dorsal view; 6, left antenna of male; 7, right metaleg of apterous male, posterior view; 8, left metaleg of apterous female, anterior view.

FIGURES 9 – 16. Zorotypus asymmetricus sp. nov. 9, abdomen and right metaleg of apterous male, dorsal view; 10, posterior segments of male abdomen, dorsal view; 11, right male cercus, ventral view; 12, abdominal sternum S 8 + S 9 of male, ventral view; 13, male genitalia, lateral view, posterior to the bottom and dorsal to the left; 14, posterior segments of female abdomen, dorsal view; 15, abdominal sternum S 9 of female; 16, posterior segments of female abdomen, ventral view. T 8 – T 11 — abdominal tergites; S 8 – 11 — abdominal sternites.

FIGURES 17, 18. Living status and occupied habitat of Zorotypus asymmetricus sp. nov. 17, living apterous male; 18, rotting logs in Sungai Esu stream valley where Z. asymmetricus sp. nov. was collected.