Nagiella bispina, Lu & Du, 2020

Lu, Xiao-Qiang & Du, Xi-Cui, 2020, Revision of Nagiella Munroe (Lepidoptera, Crambidae), with the description of a new species from China, ZooKeys 964, pp. 143-159 : 143

Nagiella bispina sp. nov. Figures 8 , 12 , 15 , 15A

Type material.

Holotype. ♂, pinned, with genitalia on a separate slide. China, Guangdong: Nanling, Babao Mountain Nature Reserve, 24.98N, 113.03E, 1070 m, 23.VIII.2010, leg. Xi-Cui Du, genitalia slide no. XLJ14011 ♂. Paratypes. China, Guangdong: 1 ♂, 1 ♀, same data as holotype. Genitalia slide no.: XLJ14009 ♀, XLJ14134 ♂.

Diagnosis.

This species is very similar to N. quadrimaculalis externally, but can be distinguished from the latter by its rather short and wide uncus with distal margin round, gnathos absent, clasper thick thorn-like, phallus with a hook-shaped cornutus; ductus bursae ca. the same length as corpus bursae with two thorn-like signa (Fig. 15A ). In N. quadrimaculalis , the uncus is trapezoidal, gnathos is slender and finger-like, clasper is thickly finger-like, and phallus exhibits no cornuti; ductus bursae is ca. twice the length of corpus bursae and corpus bursae has a small round signum (Fig. 14 ).

Description.

Adult (Fig. 8 ). Body brown tinged with copper-colour. Forewing length 11.5-13.5 mm (wingspan 26.0-30.0 mm). Frons, vertex, antenna and maxillary palpus brown. Male antenna with ventral cilia ca. half as long as the diameter of flagellomere. Labial palpus with first and second segments white ventrally, the rest brown. Thorax and abdomen brown dorsally, off-white ventrally. Legs off-white, fore tibia brown distally. Wings brown. Forewing with antemedial line excurved, unclear; orbicular spot and discoidal spot dark brown, the latter squarish; a small white spot between the orbicular spot and discoidal spot; a large white sub-reniform spot between the discoidal spot and postmedial line, up to Rs2+Rs3 and down to CuA1; postmedial line unclear, from ca. 2/3 of the costa, along outer edge of the large white spot, excurved from M2 to CuA2, then incurved and nearly vertical to the inner margin below the posterior angle of cell; cilia lightly brown with white basal line. Hindwing with discoidal spot dark brown, short band; a large white irregular quadrilateral spot between the discoidal spot and postmedial line, dentated between M2 and M3; postmedial line unclear, along outer edge of the large white spot, lightly excurved from M2 to CuA2, then incurved and nearly vertical to the inner margin below the posterior angle of cell; cilia lightly brown with white basal line. Abdomen with each segment white distally.

Male genitalia

(Fig. 12 ). Uncus rather short and wide, with distal margin round. Gnathos absent. Valva lingulate, slightly widened; clasper thick thorn-like, with a cluster of long setae at the base. Saccus conical. Juxta near diamond. Phallus with a thick hook-shaped cornutus.

Female genitalia

(Fig. 15 , 15A ). Apophyses anteriores ca. twice the length of apophyses posteriores. Ductus bursae ca. the same length as corpus bursae, expanded and sclerotized near the middle; antrum slightly sclerotized; ductus seminalis from expanded part. Corpus bursae oval; two thorn-like signa of different sizes, surrounded by dense microspines.

Etymology.

The specific name, bispina , is derived from the Latin bi (meaning two or double) and spina (meaning spine or thorn) in reference to the two thorn-like signa.

Distribution.

China (Guangdong).

Figures

Figures 4 - 8. Habitus of Nagiella species 4 N. hortulatoides male 5 N. inferior male 6 N. quadrimaculalis male 7 Nagia incomitata Swinhoe 1894 female, type, BMNH Pyr., London. 7 A head 8 Nagiella bispina sp. nov. male, holotype.

Figures 9 - 15. Genitalia of Nagiella species 9 N. hortulatoides: male, genitalia slide no. LXQ 18311 10, 13 N. inferior: 10 male, genitalia slide no. LXQ 18291 13 female, genitalia slide no. XLJ 14239 11, 14 N. quadrimaculalis: 11 male, genitalia slide no. LXQ 18310 14 female, genitalia slide no. LXQ 18306 12, 15 N. bispina sp. nov.: 12 male, holotype, genitalia slide no. XLJ 14011 15 female, paratype, slide no. XLJ 14009 15 A signa.