Cretodineutus rotundus gen. et sp. nov., the oldest adult whirligig beetle from the Upper Cretaceous of Myanmar (Coleoptera, Gyrinidae, Gyrininae)

Liang, Zulong; Qi, Zhihao; Chen, Jiahui; Jia, Fenglong

doi:10.1016/j.cretres.2019.104251

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…The same goes for the tribe Gyrinini, in that they have remained primarily medium-sized, with a few species exhibiting small body lengths, but this latter lineage suffers from a largely incomplete fossil record (Figure 10). As noted above, within Dineutini and Orectochilini, evidence for the evolution of body lengths over 10 mm does not occur until after the Cretaceous, with the only known adult Cretaceous dineutine, Cretodineutus rotundus, exhibiting a medium-sized body length of 7 mm [48]. This delayed exploration of large body size could be a result of release from competition with the only other surfacedwelling aquatic beetle known family to have existed: the extint Coptoclavidae-distant relatives of whirligig beetles [49], that persisted from the Triassic until the Early Cretaceous and included common large-bodied forms like Coptoclava longipoda which was over 39.1 mm [50].…”

Section: Significance For Gyrinidae Ecology and Evolutionmentioning

confidence: 93%

Overcoming Drag at the Water-Air Interface Constrains Body Size in Whirligig Beetles

Jami

Gustafson

Steinmann

et al. 2021

Fluids

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Whirligig beetles (Coleoptera: Gyrinidae) are among the best swimmers of all aquatic insects. They live mostly at the water’s surface and their capacity to swim fast is key to their survival. We present a minimal model for the viscous and wave drags they face at the water’s surface and compare them to their thrust capacity. The swimming speed accessible is thus derived according to size. An optimal size range for swimming at the water’s surface is observed. These results are in line with the evolutionary trajectories of gyrinids which evolved into lineages whose members are a few milimeter’s long to those with larger-sized genera being tens of millimeters in length. The size of these beetles appears strongly constrained by the fluid mechanical laws ruling locomotion and adaptation to the water-air interface.

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Section: Significance For Gyrinidae Ecology and Evolutionmentioning

confidence: 93%

Overcoming Drag at the Water-Air Interface Constrains Body Size in Whirligig Beetles

Jami

Gustafson

Steinmann

et al. 2021

Fluids

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Kupakara gen. nov., a new genus of Blediini in mid-Cretaceous amber from northern Myanmar (Coleoptera: Staphylinidae: Oxytelinae)

Chen

Newton

Huang

et al. 2023

Cretaceous Research

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Integrative phylogenomics reveals a Permian origin of Adephaga beetles

Baca

Gustafson

Alexander

et al. 2021

Systematic Entomology

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Beetles are arguably the most diverse group of animals on Earth with over 400 000 described species. Yet the timing of main diversification events among these insects remains debated. The use of phylogenomic data generated using next‐generation sequencing recently resolved most recalcitrant phylogenetic relationships across Coleoptera. However, limited taxon sampling for some major clades still prevents the use of important fossil calibrations that could provide more accurate estimates of the timing of lineage diversification events among beetles. Here, we present a new fossil‐based dated framework with a focus on the suborder Adephaga. We rely on an integrative phylogenomic approach using a combination of genomic, ultraconserved element and RNAseq transcriptomic datasets, further revealing the prevalent exonic nature of ultraconserved elements in Coleoptera. We infer a robust phylogenomic tree under various optimality criteria and analytical conditions. Our preferred phylogenetic reconstruction is consistent with those of previous phylogenomic studies in recovering the paraphyly of ‘Hydradephaga’, Gyrinidae as sister to all other Adephaga, the monophyly of Geadephaga and Haliplidae as sister to a monophyletic Dytiscoidea. We further recover strong support for paraphyly of Aspidytidae and the placement of Hygrobiidae as part of a clade comprising Aspidytes, Ribera, Beutel, Balke & Vogler, Sinaspidytes Balke, Beutel & Ribera and Amphizoidae. Using 23 carefully chosen fossil calibrations across Coleoptera, we infer the origin of modern beetles ca. 317 Ma in the mid‐Carboniferous, the divergence between Archostemata and Adephaga ca. 296 Ma in the early Permian, and the crown of Adephaga in the end‐Permian ca. 255 Ma. Importantly, our analyses provide more precise estimates of divergence times for internal splits within Adephaga, including ground beetles, tiger beetles and aquatic adephagan lineages. These results represent a major step forward in our understanding of beetle diversification and will serve as a fundamental framework to unravel the evolutionary history of many clades within Adephaga.

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Cretodineutus rotundus gen. et sp. nov., the oldest adult whirligig beetle from the Upper Cretaceous of Myanmar (Coleoptera, Gyrinidae, Gyrininae)

Cited by 3 publications

References 11 publications

Overcoming Drag at the Water-Air Interface Constrains Body Size in Whirligig Beetles

Overcoming Drag at the Water-Air Interface Constrains Body Size in Whirligig Beetles

Kupakara gen. nov., a new genus of Blediini in mid-Cretaceous amber from northern Myanmar (Coleoptera: Staphylinidae: Oxytelinae)

Integrative phylogenomics reveals a Permian origin of Adephaga beetles

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