Sasajiscymnus acutus Tong & Wang

TONG, JUNBO, CHEN, XIAOSHENG, ZHANG, XIAONING, HUO, LIZHI, WU, GANG, PENG, ZHENGQIANG & WANG, XINGMIN, 2022, A review of the genus Sasajiscymnus Vandenberg, 2004 from China (Coleoptera, Coccinellidae), Zootaxa 5207 (1), pp. 1-104 : 11

Sasajiscymnus acutus Tong & Wang sp. nov.

( Figs 3d, 3h , 5 , 63 )

Chinese name: 尖叶ḧ瓢•

Diagnosis. This species closely resembles S. anmashanus ( Yang, 1971) , but can be distinguished from the later by the apically pointed penis guide in ventral view, and yellowish brown antennae and maxillary palpi ( Figs 5c, 5h ). In S. anmashanus , penis guide is apically rounded in ventral view, antennae and maxillary palpi are black ( Figs 6c, 6h ).

Description. TL: 1.46–2.09 mm, TW: 1.06–1.46 mm, TH: 0.65–0.78 mm.

Body oval, moderately convex, surfaces covered with short pubescence ( Figs 5a–c ). Body uniformly black, except antennae, maxillary palpi and tarsi yellowish brown. Interocular distance slightly greater than eye width in frontal view. Dorsal pubescence forming distinct wavy patterns on elytra. Abdominal postcoxal lines incomplete, recurved toward the base of ventrite ( Fig. 5d ).

Male genitalia: Penis slender, penis capsule with short outer arm and long inner one, apex of penis pointed ( Figs 5e–f ). Penis guide triangular in lateral view with pointed apex; parameres about 1/2 as long as penis guide, with a tuft of long setae at apex; penis guide widest at base in ventral view, tapering towards pointed apex ( Figs 5g –h ).

Female genitalia: Coxites triangular; styli strongly reduced and hardly visible; spermatheca worm-like, with basal ramus and nodulus ( Figs 3d, 3h ).

Type material. Holotype: China: Yunnan: ♂, Dajian Mountains, Daweishan National Nature Reserve , 2100 m, 20–21.IV.2008, Wang XM leg ( SCAU) . Paratypes ( SCAU): China: Yunnan: 1♀, Gaoligongshan National Nature Reserve , 19.IX.2006, Wang XM leg ; 2♂ 5♀, Xujiaba, Ailaoshan National Nature Reserve , 1–3.X.2006, Wang XM leg ; 2♂ 1♀, Taizhong Town , Jingdong County, 3.X.2006, Wang XM leg ; 4♂ 2♀, Heiwadi , Gongshan County, 2020 m, 19.VII.2010, Wang XM leg ; 2♀, Xujiaba, Ailaoshan National Nature Reserve , 2484 m, 15.VIII.2013, Chen XS leg ; 1♂, Xujiaba, Ailaoshan National Nature Reserve , 2484 m, 16.VIII.2013, Chen XS leg ; 5♂, Xujiaba, Ailaoshan National Nature Reserve , 2524 m, 17.VIII.2013, Chen XS leg ; 2♂, J22 County Highway, Wuliangshan National Nature Reserve , 2400 m, 18.VIII.2013, Chen XS leg. Fujian: 2♂, Zhangjia, Wuyishan National Nature Reserve , 950 m, 16.IX.2012, Huo LZ leg.

Distribution. China (Fujian, Yunnan).

Etymology. The specific epithet acutus derives from the Latin word “acutus” and refers to the apically pointed penis guide.

Figures

FIGURE 3. Female genitalia of Chinese Sasajiscymnus spp.: a, e S. atypicus Tong & Wang sp. nov., b, f S. bivalvis (Yu, 1997), c, g S. sylvaticus (Lewis, 1896), d, h S. acutus Tong & Wang sp. nov., i, m S. amplus (Yang & Wu, 1972) j, n S. intricatus Tong & Wang sp. nov., k, o S. kurohime (Miyatake, 1959), l, p S. tumidus Tong & Wang sp. nov., a–d, i–l spermatheca, e–h, m–p ovipositor. Scale bars: 0.1 mm

FIGURE 5. S. acutus Tong & Wang sp. nov.: a dorsal view, b lateral view, c frontal view, d abdomen, male, e–h male genitalia: e penis, f apex of penis, g tegmen, lateral view, h tegmen, ventral view. Scale bars: a–c: 0.5 mm; d–h: 0.1 mm.

FIGURE 6. S. anmashanus (Yang, 1971): a dorsal view, b lateral view, c frontal view, d abdomen, male, e–h male genitalia: e penis, f apex of penis, g tegmen, lateral view, h tegmen, ventral view. Scale bars: a–c: 0.5 mm; d–h: 0.1 mm.

FIGURE 63. Distribution of the Sasajiscymnus sylvaticus species group: ● S. fusinus Tong & Wang sp. nov.; ■ S. ohtai (Yang & Wu, 1972); ◆ S. anmashanus (Yang, 1971); ▲ S. acutus Tong & Wang sp. nov.; ★ S. subulatus Tong & Wang sp. nov.