Earliest teredid beetle from mid-Cretaceous amber of northern Myanmar (Coleoptera: Coccinelloidea: Teredidae): new genus and species

The earliest fossil member of Teredidae, Delteredolaemus hei Li & Cai gen. et sp. nov., is reported from mid-Cretaceous Burmese amber. Delteredolaemus is assigned to the extant tribe Teredini, and shares a generally similar morphology with the extant genus Teredolaemus Sharp, 1885, although it can be distinguished from all other members in the tribe by the shape of the pronotum and mesoventral process, as well as the anteromedially tumid metaventrite.

KEY WORDS:
Mesozoic; fossil; taxonomy; Burmese amber; Teredini

Authorship

Yan-Da Li

conceived the study

acquired and processed the photomicrographs

co-writing

State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences. Nanjing 210008, China.Chinese Academy of SciencesChinaNanjing, ChinaState Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences. Nanjing 210008, China.

Bristol Palaeobiology Group, School of Earth Sciences, University of Bristol. Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, United Kingdom.University of BristolUnited KingdomBristol, United KingdomBristol Palaeobiology Group, School of Earth Sciences, University of Bristol. Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, United Kingdom.

http://orcid.org/0000-0002-9439-202X

Di-Ying Huang

co-writing

http://orcid.org/0000-0002-5637-4867

Chen-Yang Cai

conceived the study

co-writing

http://orcid.org/0000-0002-9283-8323

Corresponding author: Chen-Yang Cai (cycai@nigpas.ac.cn)

Editorial responsibility

Gabriel L.F. Mejdalani

Author Contributions

Y-DL and C-YC conceived the study. Y-DL acquired and processed the photomicrographs. Y-DL drafted the manuscript, to which C-YC contributed. All authors commented on the manuscript and gave final approval for publication.

Competing Interests

The authors have declared that no competing interests exist.

Data Availability

The original confocal data and micro-CT are available in Zenodo repository (https://doi.org/10.5281/zenodo.7072965).

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (5)

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Figures 1-2
General habitus of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under incident light: (1) dorsal view; (2) ventral view. Scale bars: 500 μm.

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Figures 3-4
General habitus of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under confocal microscopy: (3) dorsal view; (4) ventral view. Scale bars: 500 μm.

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Figures 5-6
General habitus of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under confocal microscopy, with depth color coding: (5) dorsal view; (6) ventral view. Scale bars: 500 μm.

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Figures 7-12
Details of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under confocal microscopy: (7) head, anteroventral view; (8) prothorax, ventral view; (9) mesothorax, ventral view; (10) abdominal base, ventral view; (11) abdominal apex, ventral view; (12) pronotal and elytral bases, dorsal view, with arrowhead showing the medially produced posterior pronotal edge. (a1) antennomere 1, (el) elytron, (lbp) labial palp, (md) mandible, (msf) mesofemur, (mstb) mesotibia, (msv) mesoventrite, (mtf) metafemur, (mtv) metaventrite, (mxp) maxillary palp, (pc) procoxa, (pf) profemur, (pn) pronotum, (ptb) protibia, (ptc) protrochanter, (sc) scutellum, (ts) tibial spine, (v1-5) ventrites 1-5. Scale bars: 100 μm.

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Figures 13-17
X-ray microtomographic reconstruction of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000: (13) dorsal view; (14) ventral view; (15) lateral view; (16) anterodorsal view; (17) head, ventrolateral view. (a1-11) antennomeres 1-11. Scale bars: 500 μm in (13-16), 200 μm in (17).

Figures 1-2 General habitus of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under incident light: (1) dorsal view; (2) ventral view. Scale bars: 500 μm.

Figures 3-4 General habitus of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under confocal microscopy: (3) dorsal view; (4) ventral view. Scale bars: 500 μm.

Figures 5-6 General habitus of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under confocal microscopy, with depth color coding: (5) dorsal view; (6) ventral view. Scale bars: 500 μm.

Figures 7-12 Details of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000, under confocal microscopy: (7) head, anteroventral view; (8) prothorax, ventral view; (9) mesothorax, ventral view; (10) abdominal base, ventral view; (11) abdominal apex, ventral view; (12) pronotal and elytral bases, dorsal view, with arrowhead showing the medially produced posterior pronotal edge. (a1) antennomere 1, (el) elytron, (lbp) labial palp, (md) mandible, (msf) mesofemur, (mstb) mesotibia, (msv) mesoventrite, (mtf) metafemur, (mtv) metaventrite, (mxp) maxillary palp, (pc) procoxa, (pf) profemur, (pn) pronotum, (ptb) protibia, (ptc) protrochanter, (sc) scutellum, (ts) tibial spine, (v1-5) ventrites 1-5. Scale bars: 100 μm.

Figures 13-17 X-ray microtomographic reconstruction of Delteredolaemus hei gen. et sp. nov., holotype, NIGP200000: (13) dorsal view; (14) ventral view; (15) lateral view; (16) anterodorsal view; (17) head, ventrolateral view. (a1-11) antennomeres 1-11. Scale bars: 500 μm in (13-16), 200 μm in (17).

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Earliest teredid beetle from mid-Cretaceous amber of northern Myanmar (Coleoptera: Coccinelloidea: Teredidae): new genus and species

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[1] Corresponding author: Chen-Yang Cai (cycai@nigpas.ac.cn)