Gisilia melanobasis, Sohn & Park, 2018

Sohn, Jae-Cheon & Park, Kyu-Tek, 2018, Two new species of Gisilia Kasy, 1968 (Lepidoptera, Cosmopterigidae) from Korea with first report of piercing oviscapts in Gelechioidea, Zootaxa 4418 (2), pp. 179-186 : 180-181

Gisilia melanobasis n. sp.

( Figs. 1, 3 , 5, 6 , 8 )

Diagnoses. Gisilia melanobasis is similar to G. thoracista ( Fig. 4 ) in external appearance, but larger than the latter (forewing length 3.1–3.8 mm). Gisilia melanobasis is also similar to G. gielisi Koster in having a cucullus and a distal saccular protrusion in the valva but differs from the latter in having a narrower cucullus and a longer phallus. The female genitalia of G. melanobasis lack a signum and have a sclerotized band in the ductus bursae not reaching the ostium bursae. These two characteristics distinguish G. melanobasis from other congeners with a sclerotized band in the ductus bursae.

Description. Head—Vertex dark brown; frons dark brownish grey, tinged with pale yellowish grey laterally. Antenna 1/2 as long as forewing; scape dark brown; flagellum dark brown on basal 3/5, pale yellowish grey on apical 2/5. Labial palpus upcurved, pointed apically; 1 st palpomere dark brown; 2nd palpomere dark brown on outer surface, pale greyish orange on inner surface, 5× longer than 1 st palpomere ; 3rd palpomere dark brown on outer surface, pale greyish orange on inner surface, as long as 2nd palpomere. Thorax—Tegula, mesonotum dark brown; mesoscutellum pale greyish orange. Foreleg with coxa and femur lustrous pale yellowish grey on outer surface, dark brown on inner surface; tibia dark brown dorsally, pale brownish grey ventrally, with pale yellowish grey band apically; tarsomere dark brown, with pale yellowish grey ring apically. Midleg with coxa pale brownish grey; femur lustrous pale yellowish grey on outer surface, dark brown on inner surface; tibia dark brown dorsally, pale greyish orange ventrally, with pale yellowish grey band apically; tarsomere dark brown, with pale yellowish grey ring apically. Hindleg with coxa dark brownish grey; femur dark brownish grey on outer surface, lustrous pale yellowish grey on inner surface; tibia dark brown dorsally, lustrous pale yellowish grey ventrally, with pale yellowish grey band apically; tarsomere dark brown dorsally, dark brownish grey ventrally, with pale yellowish grey ring apically. Forewing length 3.8–4.4 mm, pale greyish orange, suffused with dark brownish grey on costal and apical areas; basal area dark brown; a dark brown spot at middle and distal end of discal cell, and at middle of CuP fold; fringe dark greyish brown. Hindwing and fringe brownish grey. Male abdominal segment VIII ( Fig.

5)—posterior process of tergite ( Fig. 5b ) with large triangular basal plate and small triangular distal plate; sternite long-subtrapezoidal, with two elongate process ( Fig. 5c ); pleural area expanded, densely wrinkled ( Fig. 5b ). Male genitalia ( Fig. 6 )—Uncus absent; tegumen round laterally, slightly bulged apically; tuba analis slightly sclerotized ventrally. Valvae asymmetrical; each valva rectangular in basal 2/3, linguiform in distal 1/3; right cucullus narrowly round apically, setose, with two rows of spiniform setae along marginal area; left cucullus subtriangular apically, same as right cucullus in setal area; sacculus gradually broadened to base, with small, digitate, setose process distally on left valva, with narrowly-round, setose lobe on right valva. Juxta triangular, ankylosed with phallus. Vinculum broadly rounded laterally, slightly concave medially; saccus sub-hexagonal, with elongate process medially. Phallus heavily sclerotized, bi-sinuous, with apical 3/5 laterally flattened, acuminate apically; basal 1/5 of phallus narrowly curved. Female genitalia ( Fig. 8 )—Oviscapt ( Fig. 8a ) elongate, heavily sclerotized, hastate apically, 1/2 as long as apophyses posteriores; oviscapt cone narrow, sclerotized lateroapically, sparsely setose, with membranous collar apically. Apophyses posteriores as long as apophyses anteriores. Sternite VII adjacent to ostium bursae emarginated ( Fig. 8b ). Ductus bursae narrowed near ostium bursae, once coiled near anterior 1/3, with a narrow band-like sclerite in anterior 4/5; ductus seminalis arising near ostium bursae. Corpus bursae ( Fig. 8c ) elliptical, with medially-constricted quadrate sclerite on neck near ductus bursae; signum absent.

Types. Holotype —♂, “HOLOTYPE | Gisilia | melanobasis | Sohn & Park 2018” [red label], “Sanghyo [Jeju Prov., Seogwipo-si, Sanghyo-dong] | (LT) [light] | 11.Sep.2014 ”, “[genitalia slide number] 6617”, deposited in NIBR. Paratypes (2♂, 9♀)—1♀, Gyonggi Prov., Pocheon-gun, Gwangreung, 10 June 1998 (SH Won), [GSN] 6620, KTP; 1♂, 2♀, Jeonam Prov., Yeosu-si, 25 June 2017 (JC Sohn), [GSN] SJC-1090 (♂), MPNU; 6♀, Jeju Prov., Jeju-si, Jeju National University, 17–18 May 1991 (KT Park), [GSN] SJC-1089, NIBR & KTP; 1♂, Jeju Prov., Jeju-si, Ara-dong, 11 September 2014, KTP.

Distribution. South Korea.

Etymology. The species epithet, melanobasis , is derived from the Greek words, ‘ melanos ’ and ‘ basis ’, meaning “black” and “bottom” respectively, and refers to the dark brown basal area of the forewing.

Figures

FIGURES 1–4. Adults of Gisilia. 1. G. melanobasis n. sp., male, holotype; 2. G. melanobasis n. sp., female, paratype (Gwangreung); 3. G. tamrae n. sp., male, holotype; 4. G. thoracista (Meyrick), female, topotype (Madulsima, Sri Lanka), USNM.Scale bars = 2 mm.

FIGURES 5–7. Male abdomen VIII (5) and male genitalia (6–7) of Gisilia. 5. G. melanobasis n. sp., holotype, sternite on left (a—processes on sternite, b—pleural area, c—process on tergite); 6. G. melanobasis n. sp., paratype (SJC-1090); 7. G. tamrae n. sp., holotype (SJC-1091).

FIGURES 8–10. Female genitalia of Gisilia. 8. G. melanobasis n. sp., paratypes (SJC-1095 & KTP-6620) (a. oviscapt; b. close-up of apical area of oviscapt; c. ostium bursae and caudal part of ductus bursae; d. sclerites around connection between ductus and corpus bursae); 9. G. tamrae n. sp., paratype (SJC-1092) (a. oviscapt; b. ostium bursae and caudal part of ductus bursae; c. signa); 10. G. thoracista (Meyrick), topotype (SJC-1084) (a. oviscapt; b. ostium bursae and caudal part of ductus bursae; c. signa).