Delteredolaemus hei Li & Cai, 2022

Li, Yan-Da, Huang, Di-Ying & Cai, Chen-Yang, 2022, Earliest teredid beetle from mid-Cretaceous amber of northern Myanmar (Coleoptera: Coccinelloidea: Teredidae): new genus and species, Zoologia (e 22042) 39, pp. 1-9 : 2

publication ID	https://doi.org/ 10.1590/S1984-4689.v39.e22042
DOI	https://doi.org/10.5281/zenodo.13173806
persistent identifier	https://treatment.plazi.org/id/03F287AC-E703-126E-92F9-FB5CFC44B3C1
treatment provided by	Felipe
scientific name	Delteredolaemus hei Li & Cai
status	sp. nov.

Treatment

Delteredolaemus hei Li & Cai sp. nov.

Figs 1–17 View Figures 1–2 View Figures 3–4 View Figures 5–6 View Figures 7–12 View Figures 13–17

https://zoobank.org/ 30C72903-95AF-4730-AC7A-CD6298FDE330

Material. Holotype, NIGP200000 View Materials .

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; Shi et al. 2012, Mao et al. 2018).

Diagnosis. As for the genus.

Description. Body elongate, cylindrical, about 1.75 mm long, 0.45 mm wide, widest in anterior part of abdomen; surface with scattered setae.

Head ( Fig. 7 View Figures 7–12 ) prognathous, widest across the eyes. Compound eyes ( Fig. 7 View Figures 7–12 ) finely facetted, without interfacetal setae. Antennal insertions ( Fig. 16 View Figures 13–17 ) exposed from above. Antennae ( Figs 7 View Figures 7–12 , 17 View Figures 13–17 ) likely 11-segmented; antennomere 1 robust; antennomeres 1–4 progressively narrower; antennomeres 10 and 11 forming a relatively compact club; antennomeres 1–9 with scattered long setae only; antennomere 11 with dense sensorial setae. Mandibles ( Fig. 7 View Figures 7–12 ) (at least) bidentate. Maxillary palps ( Fig. 7 View Figures 7–12 ) 4-segmented, with apical palpomere subconical. Labial palps ( Fig. 7 View Figures 7–12 ) with apical palpomere likely cylindrical.

Pronotal disc about 1.4 times as long as wide; surface without special modifications (carinae, cavities, grooves, or paired impressions); posterior pronotal edge posteriorly produced at middle, forming rather distinct angle ( Fig. 12 View Figures 7–12 ); lateral pronotal carinae complete ( Fig. 15 View Figures 13–17 ). Notosternal suture complete ( Fig. 15 View Figures 13–17 ). Prosternal process either absent or completely concealed by projecting procoxae ( Fig. 8 View Figures 7–12 ). Procoxae ( Fig. 8 View Figures 7–12 ) projecting and contiguous (status of coxal cavities unknown).

Scutellar shield ( Fig. 12 View Figures 7–12 ) small and rounded. Elytra ( Fig. 3 View Figures 3–4 ) elongate; surface with clear puncture rows, without costae; scutellar striole absent; epipleura narrow. Mesoventrite ( Fig. 9 View Figures 7–12 ) without median carina; mesoventral process well-developed, slightly broadened at middle, apically narrowly rounded. Mesocoxal cavities narrowly separated ( Fig. 9 View Figures 7–12 ). Metaventrite anteromedially tumid ( Figs 6 View Figures 5–6 , 9 View Figures 7–12 ); median discrimen absent. Metacoxae ( Fig. 10 View Figures 7–12 ) transversely oval, narrowly separated.

Legs well-developed, slender. Trochanters large and well visible, with strongly oblique trochanterofemoral joint ( Figs 8–10 View Figures 7–12 ). Tibiae with spines present at outer apical angle only ( Figs 8–10 View Figures 7–12 ); tibial spurs 2-2-2, well-developed ( Figs 8–10 View Figures 7–12 ). Tarsi all 4-segmented; tarsomeres simple, unlobed ( Figs 8–10 View Figures 7–12 ). Pretarsal claws simple; empodium present, bisetose.

Abdomen with five ventrites ( Figs 10, 11 View Figures 7–12 ). Ratio of ventrite lengths along middle: 3.8:1.3:1.1:1.0:1.5. Ventrite 1 with intercoxal process narrow and apically acuminate ( Fig. 10 View Figures 7–12 ).

Etymology. The species is named after Mr. Hai-Kun He (Guangdong, China), who kindly donated many fossils for our research.