Sanaungulus undecimus, Yang & Zhao & Liu, 2024

Yang, Yuxia, Zhao, Wei & Liu, Haoyu, 2024, Taxonomic notes and new species of Burmomiles and Sanaungulus (Coleoptera, Cantharidae) from northern Myanmar during the late Mesozoic, Contributions to Zoology 2024 (2), pp. 153-177 : 164-167

Sanaungulus undecimus sp. nov.

(figs. 5, 6)

Etymology. The specific epithets derived from Latin “ undecimus ” (eleventh), referring to its antennomere XI bilaterally compressed and widened.

Material. Currently only one specimen is known. This holotype is deposited in the Museum of Hebei University, Baoding, China ( MHBU, No. BU-COL-CAN0016) .

Horizon and locality. The lowermost Cenomanian (98.79 ± 0.62 Ma), mid-Cretaceous (Shi et al., 2012). Myanmar: Kachin State, Myitkyina District, Tanai Township, Hukawng Valley.

Differential diagnosis: The species looks similar to S. cuaroni (Bramanti & Fanti, 2022) comb. nov. in the roundish eyes and antennomere VI–X each with an appendage, XI very robust and rounded apically, but can be distinguished from the latter by the pronotum wider than head, antennomere II longer than III, elytra parallel-sided. In comparison, the pronotum of S. cuaroni is slightly narrower than head, the antennomere III is longer than II, and the elytra are narrowed posteriorly (Bramanti & Fanti, 2022: figs. 1, 2).

Description. Male (figs. 5B, 6A). Total length 3.0 mm (from anterior margin of clypeus to apices of elytra); width 0.85 mm. Body approximately 1.6 times longer than wide, head, pronotum and elytra dark brown, antennae and legs yellow brown.

Head (fig. 6A, B) 0.40 mm long, 0.70 mm wide, roundish. Eyes small and prominent, roundish, inter-ocular distance approximately 3 times greater than the eye diameter. Mandibles and terminal maxillary invisible. Terminal labial palpomere twice as long as wide. Antennae (figs. 5B, 6) pectinate, relative elongate, probably surpassing elytral apices if extending posteriorly, scape stout and distinctly longer than pedicel, pedicel slightly longer than III with parallel-sided, VI–IX each with an appendage inserted at a basal cavity on the ventral side, V–X parallel-sided, XI bilaterally compressed and widened; relative length of antennomeres as 10:4:3:6:9:11:13:10:9:6:10.

Pronotum (fig. 6A, B) 0.58 mm long, 0.76 mm wide, wider than head, anterior margin arcuate, lateral margins converging anteriorly, posterior margin feebly sinuate, anterior angles confluent with anterior margin and each with a small dentation, and posterior angles obtusely right-angled. Scutellum triangular, as long as wide.

Elytra (figs. 5A, 6A) 2.21 mm long, 0.85 mm wide, at base wider than pronotum, lateral margins parallel and simple, apices rounded, surface finely punctate, punctures deep and rounded in striate, which distributed along with the moderately indicated longitudinal costae on disc. Hind wing slightly longer than elytra.

Legs (figs. 5B, 6A) moderately long, femora stout, tibiae slender, all tibiae slender and longer than femora, tarsomere I distinctly longer than II; relative lengths of pro-, meso- and meta-tibiae as 10:13:21, tarsomere I as 10:15:20, and tarsomere II as 10:13:19.

Abdomen not well visible.

Remarks. The yellow amber piece originally measured 31 × 26.5 × 5 mm. The abdomen and right meta-tibia and tarsus were missing.