Rhomeocalpsua torosa Li, Tomaszewska & Cai, 2022

Li, Yan-da, Tomaszewska, K. Wioletta, Huang, Di-ying & Cai, Chen-yang, 2022, Rhomeocalpsua torosa gen. et sp. nov., a unique lineage of Endomychidae from mid-Cretaceous Burmese amber (Coleoptera: Coccinelloidea), Palaeoentomology 5 (2), pp. 146-154 : 148-149

publication ID	https://doi.org/ 10.11646/palaeoentomology.5.2.7
publication LSID	lsid:zoobank.org:pub:5FF5F114-8D18-4FAD-9586-B95802E3F2EC
DOI	https://doi.org/10.5281/zenodo.6533049
persistent identifier	https://treatment.plazi.org/id/03C887E8-C45D-7C3B-DAB0-FC53BA2AF88D
treatment provided by	Plazi
scientific name	Rhomeocalpsua torosa Li, Tomaszewska & Cai
status	sp. nov.

Treatment

Rhomeocalpsua torosa Li, Tomaszewska & Cai , sp. nov.

( Figs 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

Material. Holotype, sex unknown, NIGP180054 View Materials .

Etymology. The specific name refers to its distinctly enlarged antennal club.

Locality and horizon. Amber mine located near Noije Bum Village, Tanai Township, Myitkyina District, Kachin State, Myanmar; unnamed horizon, mid- Cretaceous, Upper Albian to Lower Cenomanian.

Diagnosis. As for the genus.

Description. Body relatively elongate, rather flattened, about 1.3 mm long, 0.5 mm wide, moderately densely setose.

Head prognathous, not retracted into prothorax. Eyes well developed, moderately protuberant, coarsely facetted, without interfacetal setae ( Fig. 4A, D View FIGURE 4 ). Antennal grooves absent ( Fig. 4B, D View FIGURE 4 ). Antennal sockets visible from above ( Fig. 5C View FIGURE 5 ). Antennae ( Figs 4C, D View FIGURE 4 , 5F View FIGURE 5 ) composed of nine antennomeres; antennomere 2 oblong; antennomeres 3–6 moniliform; antennomeres 7–9 forming a distinct club; antennomere 7 strongly asymmetrical, short and strongly transverse; antennomere 8 strongly enlarged. Maxillary palps ( Fig. 4B View FIGURE 4 ) 4-segmented, palpomere 1 smallest; palpomeres 2–4 narrowing progressively; palpomere 4 about as long as 2 and 3 combined, conical. Labial palps ( Fig. 4B View FIGURE 4 ) 3-segmented, with apical palpomere apparently enlarged.

Pronotum ( Fig. 3A View FIGURE 3 ) transverse, widest near the middle, narrower at base than elytral bases; lateral pronotal carinae complete, without raised margin ( Fig. 5D View FIGURE 5 ); anterior angles not produced; disc without pits, sulci or carinae.

Elytra about 1.8 times as long as width combined, completely covering abdomen; sides weakly rounded; disc irregularly punctate; epipleura comparatively narrow, incomplete towards apices. Mesocoxal cavities circular, moderately widely separated, laterally broadly closed by meeting of meso- and metaventrites ( Fig. 4E View FIGURE 4 ); mesotrochantins concealed; mesoventral process narrower than coxal cavity, narrowing between coxae towards apex, without apparent carinae or grooves ( Fig. 4E View FIGURE 4 ). Mesometaventral junction as straight line with meso- and metaventrites contiguous ( Fig. 4E View FIGURE 4 ). Metaventrite without postcoxal lines; postcoxal pits not apparent. Metacoxae ( Fig. 4F View FIGURE 4 ) widely separated, transverse. Hind wings well developed.

Legs relatively long and slender. Trochanterofemoral joint oblique. Femora with deep and long groove (nearly throughout their length) for receiving tibiae ( Fig. 4E, F View FIGURE 4 ). Tibiae without apical spurs, with short spines surrounding apex ( Fig. 4H View FIGURE 4 ). Tarsi 3-3-3; tarsomeres simple ( Fig. 4H, I View FIGURE 4 ). Pretarsal claws simple.

Abdomen ( Fig. 4F, G View FIGURE 4 ) with six ventrites; ventrite 1 slightly longer than ventrite 2–4 combined, without postcoxal lines.