Tisis siantara Heppner & Park, 2021

Heppner, John B., Park, Kyu-Tek & Bae, Yang-Seop, 2021, A new species of Tisis Walker from North Sumatra, Indonesia (Lepidoptera Lecithoceridae), Zootaxa 4974 (1), pp. 165-168 : 166-167

Tisis siantara Heppner & Park , new species

( Fig. 1 )

LSID

Type material. Holotype. 1 m #, 28km SW. Pematang Siantar (950m), Medan Prov., Sumatra Utara, Indonesia, 22 Aug 1992, J. B. Heppner & E. W. Diehl (genitalia slide JBH 3094). Deposited in MGCL

Diagnosis. Diagnostic characters for this new species involve the male genitalia: the male valvae are more distended with a straighter sacculus (very rounded sacculus in T. sumatraensis ), and the caudal lobe of juxta are narrow and with small bases (wider and stouter and with large triangular bases in T. sumatraensis ). The hindwing of the new species has the dark linear line curved and near the dorsal wing margin (straight and medial in T. sumatraensis ).

Description. Wingspan 25mm. Male ( Fig. 1 ). Head ( Figs 2–4 ): Yellowish brown with light orange bristles of chaetosema (chaetosema base black); antenna yellowish brown with wide basal segments brown (more so dorsolaterally), basal joints of flagellum broadly dilated with dark-brown hairs; second segment of labial palpus; long, with long, yellowish-brown scale tufts ventrally in basal 3/5, yellowish brown beyond. Thorax: Yellowish brown; tegula golden brown; patagia yellowish brown with long setae; legs yellowish brown with golden setal ends on long scale tufts; hindlegs white-tan. Forewing: Dark brown, with median elongated yellow patch and yellow on costa; thin line at base and to costal 1/3 beyond midwing; wing color mixed with some pale scales on brown areas; fringe golden brown; venter pale yellowish brown, with fringe of light orange-brown from tornus and along costal margin. Hindwing: Dark brown linear marking from base to tornus on dorsal portion of wing, curved to apex, margined with golden-yellow medially and on costa, with large hyaline patch centrally; some black scales mixed in near termen; fringe yellow to golden, becoming brown on anal margin; venter pale brown, with yellow-tan on costa and costal fringe, to yellow fringe on termen to bronze-brown on anal margin. Abdomen: Bronze-tan, with lateral line of dark brown; venter white-tan; genital tufts yellow-tan. Male genitalia ( Fig. 5 ): Uncus short, pyramidal; tegumen quadratic with rounded dorsal corners; gnathos recurved to acute claw-like point directed downwards; vinculum broadly rounded, with round undifferentiated saccus; juxta a small rounded trapezoidal plate, with long, slender caudal processes meeting centrally as upward approximate stout sinuate projections; valva elongate, with somewhat straight dorsal margin to upcurved diversion midway to rounded cucullus-like termen, acute dorsally, with strong setal-spine margin distally, an inward tooth-like inwardly directed projection (or absent); saccular margin slightly curved to emargination before cucullus, with strong ventral margin basal to median semi-circular cavity, and with a slight dentate or carinate ventral evagination before base; aedeagus elongate and relatively narrow (1/7 as wide as length), with short bulbous phallobase; cornutus as wedge-like form with a small apical hook.

Biology. Unknown.

Distribution. Known thus far only from northern Sumatra ( Indonesia).

Etymology. Named after the town (Siantar) near the type-locality in Sumatra.

Remarks. The new species superficially looks much like T. sumatraensis , but has the hindwing dark line more curved (straighter in T. sumatraensis ) and closed to the dorsal margin (central in the hindwing of T. sumatraensis ). Genital characters are more reliable for species discernment between these two species as shown in diagnosis.

Figures

FIGURE 1. Tisis siantara n. sp., male holotype (25mm wingspan) (MGCL).

FIGURE 5. Tisis siantara n. sp.: male genitalia, with details A) aedeagus, B) central genital close-up (slide JBH 3094).

FIGURES 2–4. Tisis siantara n. sp., male holotype, head close-ups, lateral (2), dorsal (3), and frontal (4) views.