Gergithus (Maculergithus) tamdao Constant & Pham 2016, subgen. et sp. nov.

Gergithus (Maculergithus) tamdao subgen. et sp. nov.

urn:lsid:zoobank.org:act: 4368D0A6-3C1D-42EB-91B2-59769EE60780

Figs 1, 2 G–H, 5–6

Diagnosis

The species can be recognized on the following combination of characters: (1) frons with a yellow spot along dorsal margin; (2) vertex yellow; (3) 3 yellow spots on tegmina along sutural margin; (4) tegmina with 10 yellow spots in total.

Etymology

The species epithet refers to the type location, Tam Dao National Park in North Vietnam. It is used as a noun in apposition.

Type material

Holotype

VIETNAM: Ƌ (dissected, Fig. 5): [Coll. I. R. Sc.N.B., Vietnam, Tam Dao N.P., 21°31'N 105°33'E, 25– 30.vii.2011, day collecting, Leg. J. Constant & J. Bresseel, I.G.: 31.993] (RBINS).

Paratype

VIETNAM: 1 ♀: same data as holotype (VNMN).

Description

MEASUREMENTS AND RATIOS. LT: Ƌ (n = 1): 6.0 mm; ♀ (n = 1): 6.5 mm. Ratio BV/LV = 4.0; LF/BF = 0.84; LTg/BTg = 1.73.

HEAD. Vertex slightly excavate, bright yellow (Fig.5A). Frons smooth and convex, largely visible from above, black-brown with broad transverse bright yellow band slightly above clypeo-frontal suture, and rounded bright yellow spot along dorsal margin, not reaching dorsolateral angles (Fig. 5 A–D). Genae black-brown, bright yellow under antennae (Fig. 5C). Clypeus smooth, slightly carinate subapically, black-brown (Fig. 5B, D). Labium dark brown, reaching median coxae, with last segment narrower and shorter than penultimate. Antennae black-brown. Scape very short; pedicel subglobulose, slightly elongate.

THORAX. Pronotum minutely punctured, with anterior margin slightly carinate behind head and 2 impressed points in middle; entirely black-brown (Fig. 5A, C). Mesonotum minutely punctured, with transverse carina along anterior margin; black-brown with round bright yellow spot on each side before lateral angle (Fig. 5A). Scutellum slightly wrinkled transversely (Fig. 5A). Tegulae black-brown (Fig. 5A, C).

TEGMINA. (Fig. 5A, C) Black-brown, elongate, minutely punctured, with external margin and apical margins rounded. Reticulum of veins very slightly visible. Ten bright yellow spots organized, from base to apex: 1, 2, 1, 2, 1, 2, 1, with 4 spots along costal margin and 3 spots along sutural margin.

HIND WINGS. Brown, unilobed, with veins darker, slightly shorter than tegmina. Venation reticulate with main longitudinal veins distinct basally and numerous cross-veinlets. Costal margin strongly sinuate; sutural margin angularly rounded at mid-length and apical margin rounded.

LEGS. (Figs 5 A–D) Elongate and slender. Pro- and mesocoxae black; metacoxae yellow-brown. Femora yellow-brown. Protibiae yellow-brown with anterodorsal and anteroventral carinae black; mesotibiae yellow-brown with externoventral carina black; metatibiae yellow-brown with 2 lateral spines near apex and 6 apical spines. Protarsi yellow-brown; mesotarsi and metatarsi yellow. Metatibotarsal formula: (2) 6/7/2.

Male genitalia

Pygofer higher than broad and with posterior margin strongly sinuate and roundly projecting in middle in lateral view, and emarginate dorsally (Fig. 6A). Gonostyli slightly longer than high in lateral view (Fig. 6A) with capitulum well developed; capitulum apically laminate and projecting anterointernally; lateral spine of capitulum acute, hooked and projecting lateroventrally; ventroapical margin of gonostyli rounded in lateral view (Fig. 6A, C). Anal tube 1.5 times longer in median line than broad, dorsoventrally flattened and curved ventrally on posterior half; sides broadly rounded and apex truncate in middle (Fig. 6 A–B); posterolateral angles projecting posteroventrally (Fig. 6 A–B). Aedeagus strongly asymmetrical with ventral lobe of phallobase elongate, parallel-sided, and roundly truncate apically (Fig. 6D). Lateroapical processes of phallobase elongate and spinose, nearly reaching apex of phallus; right process sinuate internally towards apex (Fig. 6 D–F). Left ventrolateral lobe of phallobase laminate and projecting laterally with 2 pointed processes projecting anterolaterally, the dorsal one much more developed, and another more posterior pointed process projecting laterally (Fig. 6 D–E). Rather long, spinose lateral process at basal half, on each side, projecting dorsoanteriorly (Fig. 6 D–F). Right lateral lobe of phallobase laminate, slightly concave internally (Fig. 6F).

Distribution

Known from Vietnam, Vinh Phuc province, Tam Dao National Park (see map Fig. 1).

Biology

The specimens were collected on lower vegetation, in moist evergreen low mountain forest at an altitude around 1000 m above sea level.