Parastasia qiului Zhao, 2019

Zhao, Ming-Zhi, 2019, Notes on the genus Parastasia Westwood (Coleoptera: Scarabaeidae: Rutelinae) from China, with description of a new species, Zootaxa 4613 (2), pp. 240-250 : 241-244

Parastasia qiului Zhao , new species

( Figs. 1–17 )

Type material. Holotype: ♂ (SCAU), “ CHINA: Sichuan Prov., Luzhou City, | Gulin County, Honglonghu Lake , | 28°07′17″N, 105°46′53″E, 1620m, | 2017. IV.30, larva collected by Lu Qiu, | adult active in 2017.VI. || HOLOTYPE | Parastasia qiului | Zhao, 2019 [red label]”. Paratype: 1♀ ( GUGC), “ CHINA: Guizhou Prov., Leishan County, | Mount Leigongshan Nature Reserve, | Leishan Forest Land , ca. 1500m, | larva, 2015. V.1 Bo-Yan Li leg. | emerged on 2015. VI.19 || PARATYPE | Parastasia qiului | Zhao, 2019 [yellow label]” .

Description of holotype (♂). Body length 15.0 mm, greatest width 8.8 mm.

Body shape. Elongate ovoid, strongly convex.

Color. Body entirely black, pronotum and elytra weakly shining; a transverse yellowish brown band ranging from posterior two fifths to anterior portions of elytron, encircling but not reaching scutellum, abruptly vanishing near lateral margin and suture; setae and pubescence brown.

Head. Clypeus subrectangular, anterior margin weakly reflexed, with a pair of short and blunt upright teeth in middle, rugopunctate; frontal-clypeal suture and eye-canthus simple; frons and vertex with dense large punctures (0.06–0.15 mm in diameter), some of the punctures distinctly elongated, a high tubercle at middle of frons; antennomeres 2–7 glabrous, antennomere 1 with dense long setae (0.20–0.45 mm in length), antennal club with sparse short setae (0.09–0.25 mm in length), terminal of eye canthus with a cluster of close and short setae (0.15–0.2 mm in length), the remaining part of head with dense long setae (0.25–0.63 mm in length); ratio of interocular width/width of head approximately 0.63; apical teeth of mandible short and slightly bend backward ( Fig. 14 ); galea of maxilla vestigial and small, without teeth ( Figs. 15, 16 ); labrum almost semicircular, with a short flat apex ( Figs. 11, 12 ); antennal club longer than antennomeres 2–7 combined.

Pronotum. Approximately 1.52 times as wide as long; sides strongly converging anteriad in apical two fifths, widest at middle, then almost subparallel posteriad; front angles broadly rounded, hind angles obtusely angulated; lateral margins rimmed, rim extending to posterior margin and disappearing before the scutellum; with a pair of impressions at middle of lateral portions; anterior and lateral portions transversely and densely rugopunctate, punctures gradually separated and becoming fine posteriad; with dense long setae (0.46–0.53 mm in length) on anterior and apical half of lateral portions, dense short setae (0.19–0.5 mm in length) on basal half of lateral portion.

Scutellum. Almost semicircular, sides nearly straight; with sparse and minute punctures.

Elytra. Sides weakly sinuous in basal one third, widest at basal three fifth, then narrowed posteriad; rims of lateral margins thickened in basal two fifth, narrowed posteriad and extending to the apical curvature; with 11 rows of annulated and close punctures (0.06–0.13 mm in diameter) and rather sparse minute punctures (0.03–0.04 mm in diameter), subsutural interstices with irregular punctures extend from base to apex; epipleura with a row of short setae (0.09–0.19 mm in length) extends from base to the level of ventrite 4.

Propygidium. Apical third with sparse and irregular punctures (0.03-0.13 mm in diameter), basal two third with fine and very close tiny punctures (˂ 0.01 mm in diameter); bearing sparse short setae (0.04–0.05 mm in length).

Pygidium. Outer margin rimmed; lateral margins weakly curved, flat at apex; strongly rugopunctate basally, finely and sparsely punctate laterad and apicad; bearing sparse short setae as in propygidium.

Ventral thoracic surface. Densely covered by rather long pubescence (0.86–1.44 mm in length), middle portion of metasternum with dense and recumbent long setae (0.31–0.78 mm in length); mesosternal process very short, apex rounded.

Abdominal ventrites. Feebly concave in lateral view; finely rugopunctate; ventrites 2 to 5 bearing very sparse erect short setae (0.04–0.11 mm in length), with long setae on lateral portions (0.23–0.44 mm in length); outer margin of ventrite 6 fairly concave, with a row of long setae (0.25–0.48 mm in length).

Legs. Protibiae tridentate, claws of fore legs simple, almost equal in length; outer claws of middle and hind legs slightly longer than the inner ones, incised apically and forming two branches, upper branches narrower and sharper, longer than the lower ones; lower branch of outer claw of middle leg thickened and blunt at apex, lower branch of outer claw of hind leg acute;

Aedeagus. Parameres almost symmetrical, touching subapically, each side with a rimmed and concave extension ( Figs. 7–10 ).

Female paratype. Body length 16.0 mm, greatest width 9.1 mm. General appearance similar to male holotype, body somewhat stouter; antennal club slightly shorter and less thickened; tarsi slender, claws shorter but narrower than in male; abdominal ventrites feebly tumid in lateral view; pronotum with the portion behind the head bearing dense long setae (0.21–0.44 mm in length), with sparse long setae (0.25–0.48 mm in length) posterolaterally.

Diagnosis. This species is closely allied to Parastasia akebono Wada, 2015 from northeastern India, but can be distinguished from it by the following characters: body entirely black, elytron with a broad yellowish brown transverse band occupying most of anterior part (body black, pronotum dark orange with a dark basal patch, elytron with a narrow transverse band at middle in P. akebono ), pronotum with dense long setae anterolaterally and dense short setae posterolaterally (pronotum with several setae anterolaterally in P. akebono ), apical teeth of mandible short and weakly bend backward (apical teeth of mandible long and straight in P. akebono ), parameres with a weakly concave inner margin and touching subapically (parameres with a curved inner margin and separated subapically in P. akebono ).

Etymology. Parastasia qiului Zhao , new species is named after my friend Dr. Lu Qiu, who collected and kindly sent me the single known male of this new species, which became the holotype.

Distribution. China: Sichuan, Guizhou.

Figures

FIGURES 1–6. Habitus of Parastasia qiului Zhao, new species. 1–3, holotype, male; 4–6, paratype, female; 1, 4, dorsal view; 2, 5, lateral view; 3, 6, ventral view.

FIGURES 7–17. Morphological characters of Parastasia qiului Zhao, new species. 7, aedeagus in dorsal view; 8, aedeagus in lateral view; 9, aedeagus in ventral view; 10, parameres in dorsal view; 11, labrum in dorsal view; 12, labrum showing epipharynx in ventral view; 13, right mandible in dorsal view; 14, right mandible showing mola in lateral view; 15, left maxilla showing galea in ventral view; 16, left maxilla showing galea in dorsal view; 17, mentum.