Nosodendridae, Erichson, 1846

Li, Yan-Da, Tihelka, Erik, Dahan, Loïc, Huang, Di-Ying & Cai, Chen-Yang, 2021, On the Nosodendridae from mid-Cretaceous amber of northern Myanmar (Coleoptera: Nosodendroidea), Zootaxa 5082 (3), pp. 223-244 : 225

Key to extant and extinct genera of family Nosodendridae (modified from Tihelka et al. 2021a)

1. Prosternum in front coxae extremely shortened, shorter than the half length of prosternal process; lateral portions of prosternum separated from the medial portion by a complete boundary, distinctly lowered for the reception of protrochanters and -femora ( Fig. 1 )............................................................................................. 2

- Prosternum in front coxae not extremely shortened, longer than the half length of prosternal process; lateral and medial portions of prosternum never separated by a complete boundary ( Figs 4C , 8D , 11D , 12D , 18D ).............................. 3

2. Loose antennal club consisting of three segments. Body length 4.0–10.0 mm.................... Nosodendron Latreille

- Compact antennal club consisting of two segments, with the basalmost antennomere strongly transverse. Body length typically 2.3–2.8 mm ........................................................................... Nosoglobulus Háva

3. Tarsomeres 2–4 wide, distinctly lobed ventrally ( Fig. 18G–I )................................ Mesonosa Tihelka et al.

- Tarsomeres 2–4 slender, not distinctly lobed ventrally ( Figs 4G–K , 8I , 11H–I , 14G–I , 16F )........................... 4

4. Body large, longer than 10 mm. Antennal grooves on prosternum complete (figs 1B, 4A in Tihelka et al. 2021a)............................................................................................ Basinosa Tihelka et al.

- Body smaller, shorter than 5 mm. Antennal grooves on prosternum incomplete ( Figs 8D , 11D )............................................................................................ Archaenosodendron Li & Cai gen. nov.

Figures

FIGURE 1. General habitus of extant Nosodendron fasciculare (Olivier), ventral view.

FIGURE 4. Details of Archaenosodendron cretaceum (Deng et al., 2018) comb. nov., holotype, CNU-COL-MA-0321, under confocal microscopy. A, Mouthparts, ventral view. B, Antenna, ventral view. C, Prothorax, ventral view, showing the incomplete boundary between the lateral medial portions of prosternum (arrowhead). D, Abdominal base, ventral view. E, Head, anterodorsal view. F, Scutellar shield, dorsal view. G–J, Fore legs. K, Mesotarsus. L, Metatibia. Abbreviations: an8–11, antennomeres 8–11; el, elytron; hd, head; lbp, labial palp; msts, mesotarsus; msv, mesoventrite; mt, mentum; mtc, metacoxa; mtf, metafemur; mttb, metatibia; mtv, metaventrite; mxp, maxillary palp; pn, pronotum; ps, prosternum; ptb, protibia; pts, protarsus; sc, scutellum; v1–3, ventrites 1–3. Scale bars: 200 μm.

FIGURE 8. Details of Archaenosodendron explanatum Li & Cai sp. nov., holotype, NIGP177613, under confocal microscopy. A, Head, dorsal view. B, Head, ventral view. C, Head, lateral view. D, Prothorax, ventral view, showing the incomplete antennal groove on prosternum. E–G, Fore legs. H, Mid leg. I, Hind leg. Abbreviations: an1, antennomere 1; md, mandible; msv, mesoventrite; mt, mentum; mtf, metafemur; mttb, metatibia; mtts, metatarsus; mtv, metaventrite; pc, procoxa; pf, profemur; pn, pronotum; ps, prosternum; ptb, protibia; v1,2, ventrites 1,2. Scale bars: 200 μm.

FIGURE 11. Details of Archaenosodendron remotidens Li & Cai sp. nov., holotype, NIGP177614, under confocal microscopy. A, Head, dorsal view. B, Mouthparts, ventral view. C, Antenna, ventral view. D, Prothorax, ventral view, showing the incomplete antennal groove on prosternum (arrowhead). E, Abdominal base, ventral view. F, Scutellar shield, dorsal view. G, Fore leg. H, Mesotibia and -tarsus. I, Metatibia and -tarsus. Abbreviations: an9–11, antennomeres 9–11; el, elytron; gl, galea; lbp, labial palp; md, mandible; mstb, mesotibia; msts, mesotarsus; msv, mesoventrite; mt, mentum; mtc, metacoxa; mtf, metafemur; mttb, metatibia; mtts, metatarsus; mtv, metaventrite; mxp, maxillary palp; pf, profemur; pn, pronotum; ps, prosternum; ptb, protibia; pts, protarsus; sc, scutellum. Scale bars: 200 μm.

FIGURE 12. General habitus of Archaenosodendron angulare Li & Cai sp. nov., holotype, NIGP177615, under incident light. A, Dorsal view. B, Ventral view. Scale bars: 1 mm.

FIGURE 14. Details of Archaenosodendron angulare Li & Cai sp. nov., holotype, NIGP177615, under confocal microscopy. A, Head, dorsal view. B, Mouthparts, ventral view. C, Antenna, ventral view. D, Prothorax, ventral view. E, Anterolateral depression of metaventrite, ventral view. F, G, Protibia and -tarsus. H, Fore and mid legs. I, Metatibia and -tarsus. Abbreviations: an9–11, antennomeres 9–11; lbp, labial palp; msc, mesocoxa; mstb, mesotibia; msv, mesoventrite; mt, mentum; mttb, metatibia; mtts, metatarsus; mtv, metaventrite; mxp, maxillary palp; pc, procoxa; pf, profemur; pn, pronotum; ps, prosternum; ptb, protibia. Scale bars: 200 μm.

FIGURE 16. Details of Basinosa pengweii Tihelka et al., holotype, NIGP173119. A, Weighted average stacking of micro-CT slices, showing the left antenna and antennal groove on head. B–F, confocal images. B, C, Antenna, ventral view. D, Mandibles, dorsal view. E, Prosternal process, ventral view. F, Metatarsus.Abbreviations: ag, antennal groove; an, antenna; an3–11, antennomeres 3–11; md, mandible; mtt1–4, metatarsomeres 1–4; mttb, metatibia; ps, prosternum. Scale bars: 1500 μm in A, 400 μm in B–F.

FIGURE 18. Details of Mesonosa scandens Tihelka et al., holotype, NIGP173928, under confocal microscopy. A, Head, dorsal view. B, Mouthparts, ventral view. C, Antenna, ventral view. D, Prothorax, ventral view. E, Anterolateral depression of metaventrite (arrowhead), ventral view. F, Mid leg. G, H, Fore leg. I, Mesotarsus. Abbreviations: an9–11, antennomeres 9–11; lbp, labial palp; msc, mesocoxa; msf, mesofemur; mst1–5, mesotarsomeres 1–5; mstb, mesotibia; msv, mesoventrite; mtv, metaventrite; mxp, maxillary palp; pc, procoxa; pn, pronotum; ps, prosternum; pt1–5, protarsomeres 1–5. Scale bars: 200 μm.