Bellulia tenebrosa, Han & Kononenko, 2021

Han, Hui Lin & Kononenko, Vladimir S., 2021, Six new species of the genus Bellulia Fibiger, 2008 from China and Cambodia (Lepidoptera, Erebidae, Hypenodinae). Taxonomic study of Micronoctuini Contribution III, Zootaxa 4938 (1), pp. 117-130 : 118-120

Bellulia tenebrosa sp. n.

( Figs 2 , 18 )

Type materials. Holotype: male, Cambodia, Prov. Mondul Kiri, Seima Biodiversity Conservation Area , 1- 3.vii.2011, Y.S. Bae et al., genit. prep. hhl-3720-1, coll. NEFU . Paratype: 1 male with same data as holotype, genit. prep. hhl-3724, coll. INU .

Diagnosis. This species is superficially is similar to B. kareni ( Fig. 1 ), but can be distinguish by the following characters: the forewing is rather broad (much narrover in B. kareni ); the basal line is distinct (in B. kareni it presents only on the costal margin); the antemedial line is broad and waved (in B. kareni it is smoothly curved); postmedial line bears big costal marks (in B. kareni with small costal blackish-brown mark); subterminal line broad, with grains (in B. kareni it is thin and smooth); the hindwing is less darker than forewing (in B. kareni ratherit is lighter than forewing, with weakly metallic luster). In the male genitalia of B. tenebrosa ( Fig. 18 ) the tegumen much broader than in B. kareni the ventral part of the tegumen is fused to the fultura superior bearing a prominent, log-like processes on each side which are thinner than in B. kareni ( Fig. 17 ); in the right valva the process of costa is short and straight, cone-shaped, protrudes from the exterior half of the costa (in B. kareni it is horn-shaped, protrudes from the medial part of the costa); the sacculus is apically rounded (in B. kareni it is a narrow liguliform process); the aedeagus narrower than in B. kareni and B. clara ( Fig. 19 ).

Description. Adult ( Fig. 2 ). Wingspan 9-10 mm. Head and thorax yellowish grey, mixed with yellow scales on patagium; abdomen yellowish grey, with yellow terminal part. Forewing grey to yellowish grey; basal line greyish brown; antemedial line dark greyish brown, mixed with black, waved at discal cell and near 1A+2A; median line absent; postmedial line greyish brown, slender, with blackish brown speck on costal area, arched and slightly waved; subterminal line brown, broad, incurved from costal margin to M3, then slightly waved, oblique interiorly; terminal line a row of small brown dots; fringe yellowish grey; basal area yellowish brown; subterminal area dark yellowish brown, with black scales; reniform spot yellowish white, with small and black to dark blackish brown dot. Hindwing dark yellowish grey to yellowish brown; discal spot darkly tinged; outer margin slightly incurved; fringe greyish yellow.

Male genitalia ( Fig. 18 ). Tegumen narrow, about twiceas long as vinculum,; ventrally fused to fultura superior, with prominent, stick-like, apically rounded process, fused on both sides, the left one shorter than right. Vinculum slender, V-shaped. Saccus short, V-shaped. Juxta eye-shaped, sclerotized, with full circle opening on left side in upper part. Valva broad, asymmetrical, left one narrower than right; sacculus asymmetrical, left sacculus narrow, about half length of valva, right one shorter than left, smoothly rounded apically; process of sacculus slender, straight; ampullae asymmetrical,, smoothly curved, right one larger than left, with heavy setae; process of costa in right valva short and straight, cone-shaped, protrudingfrom apical half of costa. Aedeagus with coecum about 1/6 as long as entire aedeagus; its basal third straight, distal two-thirds hardly curved, gradually tapered, rounded apically, slightly swollen at ductus ejaculatorius.,

Female genitalia. Unknown.

Etymology. The species name derived from the Latin word “ tenebris ” (dark) and refers to colouration of the adult in the B. kareni species-group.

Distribution. Cambodia (Prov. Mondul Kiri: Seima Biodiversity Conservation Area). The species was collected in the tropical rainforest zone.

Figures

FIGURES 1-8. Bellulia spp., adults. 1. B. kareni (after Fibiger 2008); 2. B. tenebrosa sp. n., holotype, Cambodia; 3. B. clara sp. n., holotype, Cambodia; 4. B. mariannae (after Fibiger 2008); 5. B. parabella (after Fibiger 2008); 6. B. hanae (after Fibiger 2008); 7. B. jiaxuanae sp. n., holotype, China; 8. B. bibella (after Fibiger et al. 2011).

FIGURES 17-22. Bellulia spp., male genitalia. 17. B. kareni (after Fibiger 2008); 18. B. tenebrosa sp. n., holotype, Cambodia, genit. prep. hhl-3720-1; 19. B. clara sp. n., holotype, Cambodia, genit. prep. hhl-3728-1; 20. B. parabella (after Fibiger 2008); 21. B. hanae (after Fibiger 2008); 22. B. jiaxuanae sp. n., holotype, China, genit. prep. hhl-3537-1.