Jankowskia obtusangula, Jiang, Nan, Xue, Dayong & Han, Hongxiang, 2010

Jiang, Nan, Xue, Dayong & Han, Hongxiang, 2010, A review of Jankowskia Oberthür, 1884, with descriptions of four new species (Lepidoptera: Geometridae, Ennominae), Zootaxa 2559, pp. 1-16 : 11-14

Jankowskia obtusangula sp. nov.

Figs. 19–22 , 30 , 38 , 39 , 42

Description. Head: Antenna bipectinate in male, the longest pectination about four times diameter of antennal shaft, simple filiform in female. Frons blackish brown suffused with sparse grey scales, smooth-scaled. Labial palpus greyish brown, short and stout, extending slightly beyond frons. Vertex greyish brown.

Thorax: Dorsal side greyish brown. Hind tibia in male without hair-pencil. Forewing length: male 24–27 mm, female 31–32 mm. Wings blackish brown. Forewing with outer margin weakly protruded; costa diffused with short longitudinal greyish brown flecks; antemedial line black, slightly protruded inwards below cell; medial line black, distinct; postmedial line black, slightly protruded outwards between M1 and M2, protruded inwards below M2, then paralleling to medial line; a yellowish brown patch outside postmedial line, the dull brown shadow in the middle of the patch indistinct; discal spot black, strip-like, distinct. Hindwing with basal area greyish brown; medial line black, indistinct, equal to postmedial line in width; postmedial line black, almost straight between M1 and M3, then slightly protruded inwards below M3; a yellowish brown patch outside postmedial line, the dull brown shadow in the middle of the patch more distinct than on forewing. Underside greyish black, postmedial line strong and black on both wings, the faint broad band outside postmedial line indistinct, discal spot weak.

Venation: Forewing: R1 and R2 separate and almost parallel in male, anastomosing in female; R3–5 diverging before anterior angle of cell; M1 diverging from anterior angle of cell, R1 anastomosing with R 2 in female.

Abdomen: First abdominal segment with pale grey band dorsally, remaining segments blackish brown.

Male genitalia: Uncus triangular, length equal to basal width. Posterior processes of tegumen triangular, almost absent, without long setae apically. Gnathos with median process rounded apically, about two-thirds as long as basal width. Valva even in width, blunt terminally, bearing a large area of long setae; one cluster of long setae near center, extending dorsally; ventral margin of valva slightly protruded outwards at middle. Saccus small, round. Juxta asymmetrical, left sclerotized process hook-like, about two-fifths length of juxta. Spines bundle of cornuti about two-fifths length of aedeagus.

Female genitalia: Sterigma with central part quadrate, lateral sclerotized lobes very long, broadened terminally. Ductus bursae slightly sclerotized, about four-fifths length of corpus bursae. Corpus bursae oval. Signum almost hexagonal, concave anteriorly, with six big teeth and irregular small protrusions around margin, the anterior two teeth longer than the posterior four ones.

Diagnosis. This new species resembles J. bituminaria in the wing patterns, but can be distinguished from it by the following characters: larger than J. bituminaria ; the yellowish brown patch outside postmedial line is more distinct; the postmedial line is stronger and black, not brown on both wings underside. In the male genitalia, the gnathos median process is longer and broader; the valva is even in width, not narrowed terminally; the left process of the juxta is hook-like, not stick-like as in J. bituminaria raddensis . In the female genitalia, the signum is almost hexagonal, but irregularly shaped in J. bituminaria ; the ductus bursae is longer.

Material examined. Holotype, 3, CHINA: Ningxia: Jingyuan Hongxialinchang, 1998 m, 10.VII.2008, coll. Song Wenhui ( IZCAS). Paratypes, 13 ( IZCAS), Ningxia: Jingyuan Erlonghelinchang, 1984 m, 12.VII.2008, coll. Song Wenhui; 13 ( IZCAS), Gansu: Zhouqu Shatan Linchang, 2400 m, 14.VII.1999, coll. Yaojian; 1Ƥ ( IZCAS), Hubei: Shennongjia Jiuhu Linchang, 1840 m, 16.VIII.1981, coll. Han Yinheng; 13 ( IZCAS), Hainan: Changjiang Bawangling Pingdonger Linchang, 8.V.2007, coll. Chen Fuqiang; 1Ƥ ( IZCAS), Sichuan: Wenchuan Wolong, 1670 m, 27.VII.1983, coll. Chai Huaicheng; 43 ( IZCAS), same locality and collector, 1920 m, 29.VII.1983; 13 ( IZCAS), same locality, 1920 m, 22.VII.1983, coll. Wang Shuyong.

Etymology. The specific name is form the Latin word obtusangulus, which means obtuse.

Distribution. China (Ningxia, Gansu, Hubei, Hainan, Sichuan).

Figures

FIGURES 19 – 22. Adults of Jankowskia. 19 – 22. J. obtusangula sp. nov. 19, male, holotype, upperside; 20, male, holotype, underside; 21, female, paratype, upperside; 22, female, paratype, underside. Scale bar = 1 cm.

FIGURES 23 – 30. Male genitalia of Jankowskia. 23, J. athleta; 24, J. taiwanensis; 25, J. fuscaria fuscaria; 26, J. curva sp. nov.; 27, J. acuta sp. nov.; 28, J. improjecta sp. nov.; 29, J. bituminaria raddensis; 30, J. obtusangula sp. nov. Scale bar = 1 mm.

FIGURES 31 – 38. Aedeagus of Jankowskia. 31, J. athleta; 32, J. taiwanensis; 33, J. fuscaria fuscaria; 34, J. curva sp. nov.; 35, J. acuta sp. nov.; 36, J. improjecta sp. nov.; 37, J. bituminaria raddensis; 38, J. obtusangula sp. nov. Scale bar = 1 mm.

FIGURES 39 – 41. Female genitalia of Jankowskia. 39, J. obtusangula sp. nov.; 40, J. fuscaria fuscaria; 41, J. bituminaria raddensis. Scale bar = 1 mm. FIGURES 42 – 46. Signum of female genitalia of Jankowskia. 42, J. obtusangula sp. nov.; 43 – 45, J. fuscaria fuscaria; 46, J. bituminaria raddensis. Scale bar = 0. 1 mm.