Archaenosodendron cretaceum (Deng, Zhou, Ślipiński, Ren & Pang, 2018) Li & Tihelka & Dahan & Huang & Cai, 2021

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 : 226

Archaenosodendron cretaceum (Deng, Zhou, Ślipiński, Ren & Pang, 2018) comb. nov.

( Figs 2–4 )

Nosodendron cretaceum Deng, Zhou, Ślipiński, Ren & Pang 2018: 212

Material examined. Holotype, CNU-COL-MA-0321.

Diagnosis. Medial antennomeres about as long as wide ( Fig. 4B ). Lateral regions of mentum without longitudinally arranged larger punctures ( Fig. 4A ). Anterior angles of mentum not obviously produced ( Fig. 4A ). Antennal grooves on prosternum about as long as half-length of prosternum in front of coxae. Outer edge of protibia with about 30 densely arranged denticles ( Fig. 4G–J ). Medial and lateral portions of prosternum separated by an incomplete ridge ( Fig. 4C ).

Remarks. Extant nosodendrids exhibit a high degree of morphological uniformity. Differences between different congeners are often very minute (e.g., Háva 2019). As we show below, some Archaenosodendron species are also very similar to each other, which makes it difficult to determine the differences under a normal stereo microscope. As we did not have a chance to check the paratype of A. cretaceum (deposited in a private collection) personally, we are not sure if the holotype and the paratype represent the same species or not.

Figures

FIGURE 2. General habitus of Archaenosodendron cretaceum (Deng et al., 2018) comb. nov., holotype, CNU-COL-MA-0321, under incident light. A, Dorsal view. B, Ventral view. C, Lateral view. Scale bars: 1 mm.

FIGURE 3. Archaenosodendron cretaceum (Deng et al., 2018) comb. nov., holotype, CNU-COL-MA-0321, under widefield fluorescence. A, Ventral view. B, Prothorax, dorsal view. C, D, Prothorax, lateral view. Scale bars: 500 μm.

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.