Bucculatrix coadnata, Liu & Liu, 2022

Liu, Hongxia & Liu, Tengteng, 2022, Two new species of Bucculatrix Zeller from southeast China (Lepidoptera: Bucculatricidae), Zootaxa 5100 (1), pp. 137-144 : 139-140

Bucculatrix coadnata sp. n.

合NJẇfl [Chinese name]

Figures 2, 2a , 4–6

Diagnosis. The new species is similar to B. tsurubamella Kobayashi, Hirowatari et Kuroko, 2010 , but can be distinguished by the following characters: i) the forewing is densely covered with brown scales, only a small part of which can be seen with white background, ii) the valvae are almost completely fused, and iii) the phallus is about twice as long as length of valva + vinculum. In B. tsurubamella , the forewing is white with a few orange or light orange-brown streaks and patches, the valvae are fused only on basal half, and the phallus is almost as long as valva ( Kobayashi et al. 2010: 42, Fig. 8F ).

Type material. Holotype ♂, CHINA, Jiangxi province, Longnan county, Anji Mt. , 25°52.38′N, 114°36.16′E, 1300 m, 2018.v.25, leg. Tengteng Liu, registration SDNU. Ent 000428 (genitalia and DNA barcode no. SDNU. LIU0155).

Adult ( Fig. 2 ). Forewing length 2.5 mm. Face dark gray, frons grayish white, scale tuft on vertex reddish brown, mixed with dark brown in central. Labial palpus minute, grayish white. Antenna with eye cap white, tinged reddish brown basally; first flagellomere notched in male ( Fig. 2a ); flagellum white with distinct black ring on each unit, 6 th to 10 th and 13 th to 17 th units counted from apex black dorsally. Legs yellowish white, black on outer surface of tibiae, with dense long gray piliform scales on hind tibiae. Forewing ground color white, densely covered with brown scales; one costal streak on distal 2/5, dark brown, extending to tornus, with numerous black scales near costa and tornus on outer margin; area beyond preceding streak white with sparse brown scales; dorsum with a cluster of black scales mesally; cilia grayish, black distally around apex. Hind wing grayish brown, cilia gray. Abdomen gray dorsally, grayish white ventrally.

Male genitalia ( Figs 4–6 ). Socii distinct, with several long setae ( Fig. 5 ). Tegumen broad, more or less rectangular, length 1.5 times width; membranous ventrally, with micro spines. Valvae almost completely fused, with only a small notch at middle distally, cylindrical, twice longer than wide, with sparse setae on apex; basal process of costa slender, as long as vinculum. Vinculum somewhat triangular. Phallus thick and straight, about twice as long as length of valva + vinculum, phallobase membranous; cornutus indistinct. Scale-sac oval ( Fig. 6 ).

Distribution. China (Jiangxi). Only known from the type locality.

Etymology. The specific name is derived from the Latin adjective “ coadnatus ”, meaning fused, indicating the valvae of the male genitalia almost completely fused with each other.

Remarks. DNA barcode analysis using a partial barcode did not assign this species to any proper group ( Fig. 1 ). It may be related to B. ulmella group in the sense of Baryshnikova (2008) and group 10 in the sense of Kobayashi et al. (2010) judged by the reduced valvae and the short and straight phallus.

Figures

FIGURE 1. Maximum Likelihood tree estimated from DNA barcodes of the new species and available DNA barcodes of other related species, presented by using Tamura 3-parameter model.

FIGURES 2−3. Adult of Bucculatrix spp. 2, 2a, B. coadnata sp. n., holotype, registration SDNU.Ent000428. 3, 3a, B. nigerivalva sp. n., holotype, registration SDNU.Ent000236. Scale bar for Figs 2 and 3: 2 mm, for Figs 2a and 3a: 0.2 mm.

FIGURES 4−8. Male genitalia of Bucculatrix spp. 4−6, B. coadnata sp. n., holotype, slide no. SDNU.LIU0155; 4, genitalia excluding tegumen (ventral view); 5, tegumen (ventral view); 6, scale-sac. 7−8, B. crataega, holotype, SDNU.LIU0024; 7, genitalia excluding phallus (ventral view); 8, phallus. Scale bar for Figs 4, 5, 7, 8: 0.1 mm, for Fig. 6: 0.2 mm.