Megatachycines pentus, Zhu & Shi & Zhou, 2022

Zhu, Qi-Di, Shi, Fu-Ming & Zhou, Zhi-Jun, 2022, Notes on the genus Microtachycines Gorochov, 1992 and establishment of a new genus from China (Rhaphidophoridae: Aemodogryllinae), European Journal of Taxonomy 817, pp. 1-10 : 4-7

Megatachycines pentus gen. et sp. nov.

urn:lsid:zoobank.org:act:F6759369-13C7-49F8-8652-9D554EBCBA23

Figs 2 , 5A–B

Diagnosis

The new species is characterized by the shapes of the male epiproct and genitalia. Male epiproct pentagonal with concave posterior margin and dorsal sclerite of male genitalia stilliform.

Etymology

The name of the new species derives from the Greek word ‘ pent ’ (‘pentagonal’), referring to the male epiproct being pentagonal.

Material examined

Holotype CHINA • ♂; Chongqing, Wushan, Dangyang ; 3 Oct. 2020; L.Y. Wang leg.; HBU.

Paratypes CHINA • 1 ♀; same collection data as for holotype; HBU • 2 ♂♂, 2 ♀♀; Chongqing, Wushan, Zhuxian ; 19 Jul. 2021; L.Y. Wang leg.; HBU .

Other Material

CHINA • 1 ♂, 1 ♀; Chongqing, Wushan, Zhuxian ; 18 Jul. 2021; L.Y. Wang leg.; HBU .

Description

BODY. Medium-sized.

HEAD. Fastigium verticis with two conical tubercles, apices obtusely rounded, pointing forward ( Fig. 2C ). Eyes ovoid, protruding forward; median ocellus oval, located between antennal sockets;

lateral ocelli circular, situated on lateral margins of basal fastigium verticis ( Fig. 2A–B ). Apical segment of maxillary palpus distinctly longer than subapical segment, apex inflated, globular.

THORAX. Pronotum long, anterior margin straight, posterior margin arcuate; lateral lobe longer than high, ventral margin arc-shaped ( Fig. 2B–C ). Mesonotum and metanotum short, posterior margin of mesonotum arcuate, posterior margin of metanotum straight. Fore coxa with one small spine; inner margin of fore femur with 11–12 spines on ventral surface, internal genicular lobe with one small spine, external genicular lobe with one long spine; fore tibia with one inner spine and two outer spines on ventral surface, apex with one pair of dorsal spines and one pair of ventral spines, between paired ventral spines with one small spine. Middle femur unarmed on ventral surface, internal and external genicular lobes each with one long spine; middle tibia with one inner spine and one outer spine on ventral surface, apex with one pair of dorsal spines and one pair of ventral spines, between paired ventral spines with one small spine. Hind femur with 7–10 inner spines on ventral surface, internal genicular lobe with one spine, external genicular lobe unarmed; hind tibia with 72–83 inner spines and 70–80 outer spines on dorsal surface, with one pair of dorsal spines in subapical area, and at apex with one pair of dorsal spines and two pairs of ventral spines, interno-dorsal spine markedly longer than hind basitarsus; hind basitarsus with one apical spine on dorsal surface.

MALE ABDOMEN. Posterior margins of all abdominal tergites without processes. Epiproct extended, pentagonal, posterior margin concave; paraproct simple, quadrangular in lateral view ( Fig. 2D–E ). Cercus slender, conical, apex acute ( Fig. 2D ). Dorsal sclerite of genitalia stilliform; dorso-lateral lobes distinctly sclerotized ( Fig. 5A–B ). Subgenital plate transverse and broad, apical area bilobed ( Fig. 2F ).

FEMALE ABDOMEN. Ovipositor longer than half length of hind femur, slightly curved upward. Subgenital plate nearly trapezoid, basal area broad, narrowing to apex, posterior margin with a concavity.

COLORATION. Body light brown, with black spots. Face with four longtudinal black stripes, inner margin of antennal socket black. Eyes black, ocelli yelow. All femora with two black rings.

Measurements (mm)

Body length: ♂: 19.46–23.38, ♀: 18.32–22.60; length of pronotum: ♂: 7.00–8.08, ♀: 8.32–8.62; length of fore femur: ♂: 11.58–13.60, ♀: 13.02–13.16; length of hind femur: ♂: 23.20–27.40, ♀: 26.08– 27.56; length of hind tibia: ♂: 26.00–30.00, ♀: 27.66–30.12; length of hind basitarsus: ♂: 4.64–6.08, ♀: 5.28–5.84; length of ovipositor: 17.46–18.36.

Distribution

China (Chongqing).

Figures

Fig. 2. Megatachycines pentus gen. et sp. nov. A–F. Holotype, ♂ (HBU). A–C. Head and pronotum. A. Frontal view. B. Lateral view. C. Dorsal view. D–F. Apex of abdomen. D. Lateral view. E. Dorsal view. F. Ventral view. G–H. Paratype, ♀ (HBU). G. Subgenital plate in ventral view. H. Ovipositor in lateral view.

Fig. 5. Male genitalia. A, C, E. Dorsal view. B, D, F. Ventral view. A–B. Megatachycines pentus gen. et sp. nov., paratype, ♂ (HBU). C–D. Megatachycines elongatus (Qin, Liu & Li, 2017) comb. nov. E–F. Megatachycines trispinosus (Qin & Li, 2020) comb. nov.