Promalactis ostacantha Wang, 2018

Jia, Yanyan, Wang, Shuxia & Bae, Yang-Seop, 2018, The genus Promalactis Meyrick (Lepidoptera: Oecophoridae) in Cambodia, with description of eight new species, Zootaxa 4422 (1), pp. 104-114 : 109-110

Promalactis ostacantha Wang , sp. nov.

( Figs 3 , 11 , 15 )

Type material. CAMBODIA: Holotype ♂, Bokor (10°37'45.60''N, 104°05'18.00''E), Kampot Province, 19.XII.2013, coll. Bae Y.S. et al., slide No. INU-NK15113 . Paratypes: 1♂, 1♀, same locality as holotype, 950 m , 4.II.2014, coll. Bae Y.S. et al., slide Nos. INU-NK15156♀, W17010♂ (NKU).

Diagnosis. This new species is similar to P. veridica Meyrick, 1913 , P. magnipuncti Kim et Park, 2012 and P. ingenticula Kim, 2017 in the forewing with a white tornal spot among those species having the antemedian fascia or both basal and antemedian fasciae not reaching the costal margin. It can be distinguished from P. veridica and P. magnipuncti by the tornal spot being sub-rectangular, which is triangular in the latter two species; in the female genitalia by having a large thorn at middle on the posterior margin of the ostium bursae, which is absent in the latter two species. It can be distinguished from P. ingenticula by the relatively short valva bearing two apical spines and the sacculus produced to a long free clavate process far exceeding the apex of the valva, while such features are absent in P. ingenticula .

Description. Adult ( Fig. 3 ) wingspan 10.0 mm. Head with vertex snowy white, frons grayish yellow, occiput black with reddish brown. Labial palpus with first and second segments pale brownish yellow; third segment blackish brown except white at apex. Antenna black on ventral surface, white on dorsal surface except distal 3/4 of flagellum alternated with black. Thorax and tegula reddish brown. Forewing yellow, markings white edged with black scales: basal fascia slender, obliquely straight outward; antemedian fascia wider, sub-parallel with basal fascia, not reaching costal margin; costal spot at distal 1/3, sub-triangular, reaching above lower corner of cell, edged with denser black scales on costal margin; tornal spot sub-rectangular, right below and smaller than costal spot; apical spot round; cilia yellow around apex, pale gray along termen, deep gray along distal part of dorsum. Hindwing and cilia deep gray. Fore- and midlegs with femora and tibiae black, with white tuft of long scales at apices of tibiae, tarsi white on ventral side, black on dorsal side except white at apices of first and second tarsomeres counting from base; hindleg with femur and tibia grayish brown on outside, grayish white on inside, tarsus brown except grayish white at apex of each tarsomere.

Male genitalia ( Fig. 11 ): Uncus wide and relatively large, slightly narrowed from base to basal 2/5, then uniformly wide to straight apex. Gnathos strong, slightly shorter than uncus, rounded apically; lateral arms short. Tegumen divided from about posterior 1/3, narrowed anteriorly to rounded apex. Valva relatively short, subrectangular, slightly narrower distally, bearing two strong apical spines of different length. Sacculus with basal 2/5 sub-ovate; distal 3/5 separated from valva, clavate, setose, slightly widened to before rounded apex. Saccus elongate, slightly narrowed to rounded apex. Juxta small, slender; lateral lobe weak, membranous. Aedeagus longer than valva, without cornutus.

Female genitalia ( Fig. 15 ): Apophyses posteriores approximately three times as long as apophyses anteriores. Sternum with long, robust spines along posterior margin. Lamella postvaginalis transversely sub-ovate. Ostium bursae round, sclerotized laterally, with a large thorn at middle on posterior margin. Ductus bursae thick basally, thinner medially, with a thin coiled sclerite at distal 1/4. Corpus bursae ovate, granulous; signum being a large rounded granulate plate with two denticles.

Distribution. Cambodia (Kampot).

Etymology. The specific epithet is derived from the Latin osti - and acanthus (thorn), referring to the large thorn on the posterior margin of the ostium bursae.

Figures

FIGURES 1–8 Adults of Promalactis spp. 1. P. latiuscula sp. nov., holotype ♂; 2. P. curvicornuta sp. nov., holotype ♂; 3. P. ostacantha sp. nov., holotype ♂; 4. P. apicuncata sp. nov., holotype ♂; 5. P. granulosa sp. nov., holotype ♂; 6. P. argentifasciaria sp. nov., holotype ♂; 7. P. quadrilobata sp. nov., holotype ♀; 8. P. trifasciata sp. nov., holotype ♀. Scale bars =1.0 mm.

FIGURES 9–14 Male genitalia of Promalactis spp. 9. P. latiuscula sp. nov., holotype, slide No. INU-NK15147; 10. P. curvicornuta sp. nov., holotype, slide No. INU-NK15133; 11. P. ostacantha sp. nov., holotype, slide No. INU-NK15113; 12. P. apicuncata sp. nov., holotype, slide No. INU-NK15159; 13. P. granulosa sp. nov., holotype, INU-NK15117; 14. P. argentifasciaria sp. nov., holotype, slide No. INU-NK15162. Scale bars = 0.2 mm.

FIGURES 15–19 Male genitalia of Promalactis spp. 15. P. ostacantha sp. nov., paratype, slide No. INU-NK15156; 16. P. apicuncata sp. nov., paratype, slide No. INU-NK15165; 17. P. granulosa sp. nov., paratype, slide No. INU-NK15128; 18. P. quadrilobata sp. nov., holotype, slide No. INU-NK15177; 19. P. trifasciata sp. nov., holotype, slide No. INU-NK15107. Scale bars = 0.2 mm.