Reniscymnus cordatus Peng & Chen 2025, sp. nov.
Year: 2025
Type: other
Abstract: Reniscymnus cordatus Peng & Chen sp. nov. Fig. 2 Diagnosis. This species resembles R. explanatus sp. nov. in external appearance but differs from the latter in the well-developed and elongate inner arm of penis capsule, and the subtriangular tegmen with penis guide in lateral view. Description. TL: 1.38–1.63 mm, TW: 1.08–1.25 mm, TH: 0.70–0.78 mm, TL / TW: 1.26–1.41, EL / EW: 0.99–1.09, PL / PW: 0.49–0.52, HW / PW: 0.64–0.67, PW / EW: 0.66–0.69. Body elongate oval, dorsum with white pubescence. Area of frons near clypeus with suberect and downward setae, distinctly longer and denser than those on top (Fig. 2 B). Body uniformly pale yellow, except tip of mandibles dark brown (Fig. 2 A – C). Eyes finely faceted, large, interocular distance about 0.3 times head width. Head and pronotal punctures fine and dense. Surface of elytra with coarse and shallowly impressed punctures. Abdominal postcoxal lines incomplete and roundly recurved, reaching 3 / 4 of length of ventrite 1, area enclosed by the lines sparely punctate, widely smooth along lines; ventrite 1 with fine and sparse punctures in middle, irregularly distributed (Fig. 2 D). Male genitalia. Penis moderately stout and rather long, longer than abdomen; penis capsule with long inner arm and short outer arm (Fig. 2 E, G), apex of penis swollen with cordate membranous appendages (Fig. 2 F, H); tegminal strut stout with a finger-like protrusion at apex (Fig. 2 I – J); phallobase subtrapezoid in lateral view (Fig. 2 I); tegmen with penis guide triangular, widest at base, apex pointed in lateral view, 3.5 times as long as parameres (Fig. 2 I); in inner view, penis guide triangular, gradually converging apically; parameres short with few long setae at apex (Fig. 2 J). Type material. Holotype: Laos • 1 ♂; Phou Kbouay NBCA; alt. 500–750 m; 2–4 Jun. 2007; X. M. Wang et al. leg.; No. SCAU (E) 17549; SCAU. Paratypes: 1 ♂; same data as for holotype • 1 ♂ 1 ♀; Vieng Xai, Xam Nua; alt. 1000 m; 11–12 Jun. 2007; X. M. Wang et al. leg. • 1 ♀; Heu Gnommolat; alt. 380 m; 25 May 2007; X. M. Wang et al. leg. • 2 ♀; Tad Fane, Pakxong; 11 Jun. 2006; C. Telakang leg. • 1 ♀; LiPHi, VoeunKHom; 9 Jun. 2006; C. Telakang leg. • 1 ♀; Khammouane Lakxao; 16 Dec. 2005; C. Telakang leg. China – Hainan Prov. • 1 ♂ 1 ♀; Xin’an, Diaoluoshan Mountains; 18 Sep. 1995; Z. Q. Peng leg. • 1 ♂; Jianfengling; 1 Apr. 1996; Z. Q. Peng leg. • 2 ♂ 4 ♀; Tianchi, Jianfengling; Sep. 1995; Z. Q. Peng leg. • 2 ♂ 8 ♀; Wuzhishan Mountains; 3 May 1996; Z. Q. Peng leg. • 1 ♂; Shamaoling, Danzhou City; Aug. 1995; Z. Q. Peng leg. • 1 ♂; Shijing, Diaoluoshan Mountains; Sep. 1995; Z. Q. Peng leg. • 1 ♀; Wufenchang, Limushan Mountains; Sep. 1995; Z. Q. Peng leg. • 1 ♀; Limushan Mountains; 21 Apr. 1996; Z. Q. Peng leg. • 1 ♂; Yinggezui, Yinggeling; 16 Apr. 2019; X. M. Wang leg. • 1 ♀; Wuzhishan Forest Park; 18°54'26"N, 109°40'47"E; alt. 670 m; 16 Apr. 2019; X. M. Wang leg. • 1 ♀; Bawangling; 16 Oct. 1997; Z. Q. Peng leg. • 1 ♀; Limushan Mountains; 22 Jul. 2006; Z. Q. Peng leg. – Guangxi Prov. • 1 ♂ 1 ♀; Fulongshan Mountains, Shiwandashan Mountains; 7 Nov. 2004; C. W. Zhang leg. • 2 ♀; Daqingshan Mountains, Pingxiang; 2 Aug. 2005; X. M. Wang leg. • 1 ♀; Banshanyao, Mao’ershan Mountains; 16 Oct. 2004; X. M. Wang leg. – Guangdong Prov. • 1 ♂ 3 ♀; Nankunshan Mountains, Huizhou; 21 Dec. 2004; Collector unknown. • 1 ♂; Wuzhishan Scenic Spot, Liangkou Town, Conghua District, Guangzhou City; 23°43'14"N, 113°48'52"E; alt. 433 m; 16 Mar. 2024; Z. D. Huang et al. leg. – Yunnan Prov. • 2 ♀; Tongbiguan, Nabang, Yingjiang; alt. 1000 m; 22–23 May 2008; X. M. Wang et al. leg. • 1 ♀; Xiaoweishan Mountains, Hekou; 23 Apr. 2008; X. M. Wang et al. leg. Distribution. China (Hainan, Guangdong, Guangxi, Yunnan); Laos. Etymology. The species epithet is derived from the Latin adjective “ cordatus ”, referring to the nearly cardioid apex of the penis. Remarks. The apex of the penis of this species is spatially swollen; consequently, different shapes were observed when the apex was rotated or viewed from different angles (Fig. 2 E – H).
Authors: Peng, Feng, Tang, Mingjie, Wang, Xingmin, Chen, Xiaosheng
Institution: South China Agricultural University
Language: English
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W6949529411
Cites:
Cited by:
Related to: