Gauromaia (Celebesa) impressa (Pic, 1923) Telnov & Ruzzier, 2024

Telnov, Dmitry & Ruzzier, Enrico, 2024, A redefinition of Gauromaia Pascoe, 1866 (Coleoptera: Tenebrionidae: Stenochiinae), Zootaxa 5551 (3), pp. 531-555 : 546-549

Gauromaia (Celebesa) impressa (Pic, 1923) comb. nov.

( Figs 9D–F )

Celebesa impressa : Pic 1923a: 23 (description).

Type material examined. Syntype 1 specimen MNHN [not sexed, presumably a male]: S. Celebes Lompa-Battau 3000´März 1896 H. Fruhstorfer [printed, black frame] // Celebesa impressa n sp [handwritten] // impressa Pic [handwritten] // Muséum Paris Coll. M. Pic [printed] // TYPE [printed, label red] // SYNTYPE [printed, label red] // Syntype Celebesa impressa Pic, 1923 [printed] // MNHN, Paris EC20367 [printed, supplemented with a QR code].

Redescription. Total body length 12.5 mm (syntype). Body elongate subcylindrical. Dorsum and venter glabrous. Head subrectangular, subopaque, flattened in dorsal aspect. Left mandible apex bidentate, right mandible apex shortly notched. Terminal maxillary palpomere securiform. Mentum subrectangular, slightly transverse, slightly convex medio-longitudinally, each side with one posterolateral and one submedian tubercle. 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, anterior margin broadly emarginate at insertion of canthus. Tempus short, slightly bulged dorso-laterally and immediately constricted posteriad, ~ 1/2 dorsal eye length. Interfacetal setae not present. Head dorsal punctures circular, variably dense. Intervening spaces variable wide, microscopically wrinkled. Antennomeres III–IV slender, glossy and glabrous. Pronotum slightly transverse, moderately convex in dorsal aspect, subopaque. Pronotal length to maximum width ratio ~ 0.9. Anterior pronotal margin subtruncate, posterior margin slightly sinuous. Anterolateral angles rounded, posterolateral angles nearly right-angled in dorsal view. Posterior and lateral edge of pronotum margined, including at posterolateral angles. Lateral edge of pronotum visible in dorsal view, broadly rounded. Pronotal disc dorsally on basal portion with shallow transverse impression. Transition of pronotal disc to hypomeron carinate.

Dorsal pronotal punctures somewhat larger than those on head dorsum, rather dense, intervening spaces variable. Prothoracic hypomeron barely punctured. Scutellar shield rounded apically, glossy and glabrous. Elytra elongate subcylindrical, convex in dorsal aspect, widened laterally in posterior 1/3, glossy and glabrous. Elytral length to maximum combined width ratio ~ 1.7. Humerus rounded, humeral callosity present, weak. Lateral margin of elytron slightly deflected, visible from above at humerus and near apex. Deflection continues to anterior margin of elytron near humerus in a form of shallow impression. Elytron not punctate, with eight shallow longitudinal striae and short, inconspicuous scutellar stria; no visible punctures in striae. Complete striae one and two stretch to nearly elytral apex. Interstriae flat, delicately irregularly wrinkled. Ratio width of elytra across humeri through apex of scutellar shield versus basal width of pronotum across posterolateral angles nearly 1.2. Epipleuron broad, extends towards near elytral apex. Procoxa widely separated, prosternal intercoxal process rather wide, flattened ventrally in anterior portion, strongly hump-like bulged in ventral aspect at posterior extent of procoxal cavity, distinctly margined laterally and at anterior edge of procoxal cavity, step-like shaped in lateral view at posterior extent of it, touches posterior margin of prosternum and apically rounded. Mesoventrite slightly transversely impressed medioventrally in front of mesocoxa, its lateral margins not elevated, median portion somewhat convex in ventral aspect between mesocoxae, apex subtruncate between mesocoxal cavities. Mesanepisternum separated from mesoventrite and mesepimeron by distinct suture. Mesocoxa broadly separated by short, broad, apically subangulate intercoxal process of metaventrite. Median length to maximum width of metaventrite ratio ~ 0.4. Metathoracic discrimen distinct, complete. Metacoxal cavities broadly separated by moderately long, apically rounded 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, slightly curved. Meso- and metatibia shorter than corresponding femur, slightly curved, slightly thickened distally. Pro- and mesotibia distinctly curved. Tarsomeres ventrally each with a brush of dense orange setae. Penultimate tarsomere subcylindrical, not bilobate. Terminal tarsomere slightly curved, pretarsal claws with short empodium. Basal metatarsomere much shorter than combined length of remaining tarsomeres.

Sexual dimorphism. Unknown.

Ecology. The studied syntype comes from lower montane rainforest.

Distribution. Southern arm of Sulawesi (Southern Sulawesi Province).

Figures

FIGURE 9. Gauromaia subgenus Celebesa Pic, 1921, adult morphology. A–C–G. (C.) elongata (Pic, 1921) comb. nov., lectotype in dorsal (A), lateral (B) and ventral (C) view; D–F–G. (C.) impressa (Pic, 1923) comb. nov., syntype in dorsal (D), lateral (E) and ventral (F) view [images courtesy Christophe Rivier, MNHN].