Gauromaia (s. str.) dives Pascoe, 1866

Telnov, Dmitry & Ruzzier, Enrico, 2024, A redefinition of Gauromaia Pascoe, 1866 (Coleoptera: Tenebrionidae: Stenochiinae), Zootaxa 5551 (3), pp. 531-555 : 536-537

Gauromaia (s. str.) dives Pascoe, 1866

( Figures 1–2 , 11A )

Gauromaia dives : Pascoe 1866: 474 (description).

Type material examined. Lectotype ♂ BMNH [herewith designated]: Type [printed, label circular, red frame] // Mt. Ophir Wallace [handwritten, label elliptical, green] // Gauromaia dives Type Pasc [handwritten] // Pascoe Coll. 93–60. [printed] // Lectotype [printed, label circular, purple frame] // NHMUK015534468 [printed, supplemented with QR code] . Paralectotype 1♂ BMNH : Paratype [printed, label circular, yellow frame] // Malacca [handwritten, label green, elliptical] // MT. OPHIR [handwritten, label circular] // Pascoe Coll. 93–60. [printed] // Gauromaia dives . Pasc. [handwritten] // Paralectotype [printed, label circular, pale blue frame].

Additional material studied. 1♂ BMNH: Borneo [handwritten] // F. Bates 81–19. [printed] ; 1♀ BMNH: Undergrowth [printed] // SARAWAK: R. Kapah trib. of R.Tinjar. [printed] 8. [handwritten] x.1932. [printed] // Oxford Univ.Exp. B.M.Hobby & A.W. Moore. B.M.1923-254 [printed] .

Lectotype designation. The lectotype designation is made herein for the type species of the genus Gauromaia to maintain nomenclatural stability, since G. dives was originally described from an unspecified number of specimens and a new concept of the genus and its subgenera as presented herein.

Redescription. Lectotype male, total body length 15.5 mm (paralectotype ♂ 14.7 mm long). Body subcylindrical in dorsal view. Dorsum and venter glabrous. Head subrectangular in dorsal view, transverse (not including wide epicranial ‘neck’), flattened in lateral view, slightly glossy and subopaque. Left mandible apex bidentate, right mandible apex shortly notched. Terminal labial palpomere subtriangular. Terminal maxillary palpomere securiform. Mentum semicircular with two longitudinal deep foveae both sides of strongly convex median portion. Epistoma subtrapezoid, broadly emarginate at anterior margin. Epistomal suture present. Canthus moderately developed, laterally not carinate, completely concealing antennal insertion and basal antennomere from above. Epicranial ‘neck’ wide, transition point from occiput not indicated. Eye strongly reniform in lateral view, anterior margin broadly emarginate at insertion of canthus. Tempus short, bulged dorso-laterally (protruding from lateral outline of head) in dorsal view, about one-fourth to one-third dorsal eye length. Interfacetal setae not present. Labrum slightly emarginate at anterior margin, with a row of short, orange, anteriad-directed setae. Head dorsal punctures elliptical, more or less strongly elongated, variably dense, becoming smaller towards epicranial ‘neck’. Tiny, curved seta raises from the centre of each puncture, and hardly surpasses margin of the corresponding puncture. Intervening spaces variably wide, with dense isodiametric microsculpture. Antenna 11-segmented with five terminal antennomeres composing club. Antennomeres I–VI rather slender, glossy and nearly glabrous; antennomeres VII–XI are variably strongly widened and dorso-laterally flattened, densely punctured and setose. Antennomere III is longest among six basal antennomeres, antennomere II is shortest among them.Antennomeres V and VI slightly inflated.Antennomeres VII–XI strongly widened and flattened, truncate to barely emarginate at distal margin. Terminal antennomere apically broadly rounded, ~ 1.5× as long as penultimate antennomere. Pronotum transverse, slightly convex in dorsal aspect, subopaque. Pronotal length to maximum width ratio is ~ 0.7. Anterolateral angles rounded, slightly produced anteriad so that medially subtruncate anterior pronotal margin appears broadly emarginate. Anterior edge of pronotum shortly margined at anterolateral margins only. Posterior pronotal edge at median portion very broadly obtusely produced posteriad, deeply margined including at posterolateral angles. Lateral edge of pronotum margined, visible in dorsal view. Transition of pronotal disc to hypomeron carinate. Dorsal pronotal punctures, intervening spaces and setation similar to those on head. Anterior margin of pronotum with a row of short, dense yellowish setae. Prothoracic hypomeron with weak isodiametric microsculpture, not or barely punctured. Scutellar shield subtriangular, pointed posteriorly, glossy and glabrous. Elytra subcylindrical in dorsal view, slightly convex in lateral aspect, slightly widened at posterior 1/3, glossy and glabrous. Elytral length to maximum combined width ratio ~ 1.4. Humerus broadly rounded, no humeral callosity present. Lateral margin of elytron slightly deflected, visible from above at around midlength. Deflection continues on anterior margin of elytron near humerus in form of a short sulcus. Elytral striae constitute of a series of impressed punctures; scutellar stria short. Elytral striae one and two reaching to nearly elytron apex. Punctures in striae of variable size, with distance between them much narrower than distance between striae. Interstriae barely convex. Ratio width of elytra across humeri through apex of scutellar shield versus basal width of pronotum across posterolateral angles is ~ 1.3. Epipleuron broad in humeral area, narrowing posteriad, extending nearly towards elytral apex. Procoxa moderately widely separated, prosternal intercoxal process rather broad, nearly straight in lateral view, extending slightly beyond procoxal cavity and posterior margin of prosternum. Mesoventrite strongly V-shapely impressed antero-ventrally between mesocoxa to accommodate prosternal intercoxal process, its lateral margins ridge-like raised at inner margin of mesosternal cavity, posterior portion of mesoventrite somewhat M-shaped. Mesanepisternum separated from mesoventrite and mesepimeron by distinct suture. Mesocoxa broadly separated by short, broad, anteriorly rounded intercoxal process of metaventrite. Metathoracic discrimen distinct, incomplete. Metacoxal cavities broadly separated by short, apically rounded to subtruncate intercoxal process of first abdominal ventrite. Last visible tergite and ventrite broadly rounded at posterior margin. Legs long, femora long and narrow, not clavate. Protibia subequal in length to profemur, curved in apical 1/3. Meso- and metatibia shorter than corresponding femur, slightly curved, thickened distally. Tarsomeres ventrally each with a brush of dense orange setae. Penultimate tarsomere subcylindrical, not bilobate. Terminal tarsomere slightly arched in lateral view, pretarsal claws with short empodium. Basal metatarsomere much shorter than combined length of remaining metatarsomeres.

Sexual dimorphism. Male protibia gently curved in the apical 1/3. Inner apical 1/3 of pro-, meso- and metatibia bearing more setae than in females.

Ecology. Species of lower to mid-montane rainforests.

Distribution. Malay Peninsula, Greater Sunda Islands (Borneo, Java (1 specimen BMNH), Sumatra).

Figures

FIGURE 1. Gauromaia (s. str.) dives Pascoe, 1866 lectotype ♂, habitus, dorsal view.

FIGURE 2. Gauromaia (s. str.) dives Pascoe, 1866 lectotype ♂, adult morphology.A–Dorsal forebody; B–Lateral forebody; C– Head, dorso-lateral view; D–ditto, frontolateral view; E–Mentum and labial palps, ventral view; F–Pro-, meso-, and metathorax, ventral view [not to scale].

FIGURE 11. Gauromaia Pascoe, 1866 species, genitalia.A–G.(s. str.) dives Pascoe, 1866, ♀ from Sumatra (BMNH), ovipositor, entire view and apex (magnified); B–G. (Celebesa) sp., ♀ from Tambusigi, Central Sulawesi (BMNH), ovipositor, entire view and apex (magnified); C–G. (Falsogauromaia) annulipes (Pic, 1921), ♀ from Crocker Range, Sabah (BMNH), ovipositor, entire view and apex (magnified); D–G. (Celebesa) angustior (Pic, 1921) comb. nov., ♀ from near Battang village, South Sulawesi (DTC), aedeagus in ventral, lateral and dorsal view [not to scale]. Abbreviations:A1–Gonostylus; A2–Coxite lobe 4; A3–Coxite lobe 3; A4–Coxite lobe 2; A5–Coxite; A6–Paraproct and a connecting membrane; B1–Gonostylus; B2–Coxite lobe 4; B3– Coxite lobe 3; B4–Coxite lobe 2; B5–Coxite lobe 1; B6–Paraproct and a connecting membrane; C1–Gonostylus; C2–Coxite lobe 4; C3–Coxite lobe 3; C4–Coxite lobe 2; C5–Coxite lobe 1; C6–Paraproct and a connecting membrane.