Aquilargilla basifixa, Cui & Xue & Jiang, 2018

Cui, Le, Xue, Dayong & Jiang, Nan, 2018, Aquilargilla gen. nov., a new genus of Sterrhinae from China with description of two new species (Lepidoptera, Geometridae), Zootaxa 4514 (3), pp. 431-437 : 433-436

Aquilargilla basifixa sp. nov.

( Figs 3, 7–9 , 11 )

Description. This new species is externally almost identical to A. ceratophora . Male 8 th sternite with cerata slender horn-like.

Male genitalia ( Fig. 7 ). Uncus and gnathos absent. Socii small and narrow, acute at apex. Tegumen with two pairs of processes on inner margin, posterior one slender and acute at tip, anterior one small and rounded at tip. Valvula and sacculus digitiform at terminal half; a short finger-like process present at base of valva. Juxta broad and quadrate, concave on posterior margin, with a pair of semicircular lobes on lateral side with spines on edge. Saccus inflated, concave medially. Aedeagus slightly curved, cornuti weak.

Female genitalia ( Fig. 11 ). Papillae anales oval. Apophyses anteriores about two-thirds of apophyses posteriores in length. Lamella antevaginalis rounded and wrinkled. Ostium weakly sclerotized. Colliculum narrow. Ductus seminalis arising from posterior part of ductus bursae. Ductus bursae partly sclerotized posteriorly, widening gradually. Corpus bursae oval; signum drop-shaped composed of small and scobinate sclerites opposed to longitudinal axis.

Diagnosis. See under Aquilargilla ceratophora sp. nov.

Material examined. Holotype, ♂, CHINA: Sichuan ( IZCAS): 1 6, Emei Shan, Qingyinge , 800–1000 m, 15– 17.IX.1957, coll. Lu Youcai (slide No. 5297) . Paratypes. Gansu ( IZCAS): 2 6 2♀, Wenxian, Tielou, 1450 m, 24.VII.1999, coll. Zhu Chaodong (slide No. 3815); 2♀, Chengxian, Feilongxia, 1020 m, 4.VII.1999, coll. Yao Jian (slide No. 3361). Sichuan ( IZCAS): 13 6, Emei Shan, Qingyinge, 800–1000 m, 17–30.VI.1957, 15–17.IX.1957, coll. Zhu Fuxing et al.; 2 6, Wanxian, Wang’erbao, 1200 m, 11.VIII.1993, coll. Song Shimei (slide No. 5298); 3 6, Guanxian, Qingcheng Shan, 700–1000 m, 23.V.1979, 4.VI.1979, coll. Shang Jinwen & Gao Ping (slide No. 5299); 1 6, Luding, Moxi, 1550 m, 12.IX.1982, coll. Wang Shuyong (slide No. 3360). Sichuan ( ZFMK): 1 6, Chasseurs Indigènes des Missionnaires de Tà-tsien-Loû , 1906; 1♀, de Tà-tsien-Loû, à Mou-Pin, Mai, Juin, 1892, Chasseurs Thibétains; 1♀, Siao-Lou , 1900, Chasseurs Indigènes. Chongqing ( IZCAS): 1 6, Youyang, Taohuayuan scenic spot, 983 m, 26.V.2017, coll. Li Henan (slide No. 5300) .

Distribution. China (Gansu, Sichuan, Chongqing).

Remarks. A male specimen labeled ‘Tschang Tang, Tibet ” From ZFMK (1 6, Tibet, Tschang-Tang, Dsagar- Berge, 4500 m, Juli, ex coll. Wehrli, 17/55.) has clearly different antennae and male genitalia. It should be treated as another new species of Aquilargilla (D. Stüning, pers. comm.). However, since the single specimen is in bad condition and the locality is dubious, more specimens need to be collected and studied to enable it to be described in future.

Etymology. The species is named on the basis of Latin word basifixus, which relates to the processes arising from the base of the tegumen.

Figures

FIGURES 1–9. Aquilargilla gen. nov. 1–3. Adult. 1. A. ceratophora, male, one areole, Fujian, China (holotype, IZCAS); 2. A. ceratophora, male, two areoles, Hunan, China (paratype, IZCAS); 3. A. basifixa, male, Sichuan, China, two areoles (holotype, IZCAS). Scale bar = 1 cm. 4–6. A. ceratophora, Fujian, China (holotype, IZCAS). 4. Male genitalia, P means the posterior pair of processes on inner margin of the tegumen; 5. Male 8 th tergite; 6. Male 8 th sternite; 7–9. A. basifixa, Gansu, China (paratype, IZCAS). 7. Male genitalia, P means the posterior pair of processes on inner margin of the tegumen, A means the anterior pair of processes on inner margin of the tegumen; 8. Male 8 th tergite; 9. Male 8 th sternite. Scale bar = 1 mm.

FIGURES 10–11. Female genitalia of Aquilargilla gen. nov. 10. A. ceratophora, Hunan, China (paratype, IZCAS); 11. A. basifixa, Gansu, China (paratype, IZCAS). The red arrow shows the point of origin of the ductus seminalis. Scale bar = 1 mm.