Sanaungulus rosenzweigi, Fanti & Damgaard, 2020

Fanti, Fabrizio & Damgaard, Anders Leth, 2020, Fossil soldier beetles of the Anders Damgaard amber collection. Fourth update, Baltic Journal of Coleopterology 20 (2), pp. 125-139 : 137

Sanaungulus rosenzweigi sp. nov.

( Figs. 13 - 14 )

Holotype. Male, in Burmese amber, accession No. ALDC0577 /ALD.Bu.220

Type locality. Myanmar: Kachin state, Myitkyina District, Tanai Township, Hukawng Valley.

Type horizon. Lowermost Cenomanian (98.79 ± 0.62 Ma), mid-Cretaceous.

Differential diagnosis. Sanaungulus rosenzweigi sp. nov. differs from Sanaungulus ruicheni ( Hsiao & Huang, 2018) , and Sanaungulus morellii sp. nov., the only other Sanaungulus with filiform antennae (Fanti 2018; Hsiao & Huang 2018; Fanti & Damgaard 2019), for the different shapes of the last urites, antennomeres and pronotum.

Description. Adult, winged, slender. Male, defined on the basis of the long antennae and the last ventrite triangular-shaped. Body length about 4.9-5.0 mm. Entirely testaceous with brown elytra. Head transverse, strongly constricted (triangular-shaped) behind the eyes, fitted with very scarce and shallow punctuation. Eyes prominent, very large, roundish, inserted in the lateral part of the head, inter-ocular dorsal distance about 3.8 times greater than the eye diameter. Mandibles elongated, thin, falciform, without teeth. Maxillary palps 4-segmented with the last palpomere securiform and thinner apically. Labial palps 3-segmented, with the last palpomere securiform. Antennae 11-segmented, filiform, long, slightly surpassing the elytra, not reaching the last abdominal segments, antennal insertion in the eyes proximity; scape elongated, enlarged basally, thinner apically; antennomere II short, about 2.5 times shorter than scape; antennomere III slightly longer than second; antennomeres IV-IX sub-equal, very long and thin; antennomeres X-XI shorter than previous ones and slightly sturdier; all the antennomeres with pubescence. Pronotum slightly transverse, as wide as head, anterior margin strongly rounded and slightly bordered, posterior margin straight and slightly bordered, sides rounded, posterior corners obtuse, pronotum disc smooth and lustrous. Scutellum triangular-shaped, rounded at apex. Elytra very short which reveals various abdominal segments, wider than pronotum, humeral zone large, posteriorly slightly narrower, parallel-sided, elytra not deiescent, rounded apexes, surface with punctures slightly in relief and arranged in longitudinal striae. Posterior wings transparent and surpassing the elytra, not reaching the last abdominal segments. Sternum sub-quadrate, ventrites wide and transverse, last tergite very long and wide with emarginate apex, penultimate ventrite apically with two short lobes, last ventrite triangular-shaped and rounded apically. Legs thin, covered with little pubescence; coxae massive; trochanters elongated, with rounded apex; femora curved, more robust than tibiae, cylindrical; tibiae thin, cylindrical, without spur near the apex, protibiae shorter than profemora, meso- and metatibiae longer than meso- and metafemora. Tarsal formula 5-5-5; first tarsomere long; second tarsomere about 1.8 times shorter than first; third tarsomere short; fourth strongly bilobed; fifth tarsomere elongated, thin, flat and slightly curved; claws simple, without denticle at the base.

Etymology. Named in honor of the Danish artist Tal Rosenzweig, known as Tal R.

Syninclusions. Air bubbles, few botanical remains, a dypteran ( Diptera Brachycera Empidoidea ).

Remarks. The circular amber piece measures approximately 13 x 4.5 mm. The inclusion is complete but rather convoluted.

Figures

Fig. 13. Sanaungulus rosenzweigi sp. nov. ALDC0577/ALD.Bu.220 in Burmese amber.A: Holotype, detail of pronotum, bar = 0.5 mm; B: Holotype, detail of elytral apex, and last tergites, bar = 0.5 mm; C: Holotype, detail of prolegs, bar = 0.2 mm; D: Holotype, detail of last ventrites, bar = 0.2 mm.

Fig. 14. Sanaungulus rosenzweigi sp. nov. ALDC0577/ALD.Bu.220 in Burmese amber. A: Holotype, dorsal view, bar = 1.0 mm; B: Holotype, ventral view, bar = 1.0 mm.