AI Article Synopsis
- Marsh beetles (Scirtidae) are key to understanding the evolutionary history and success of beetles in the suborder Polyphaga, but studying their lineage has been difficult due to limited fossil evidence.
- A new genus and species, Varcalium lawrencei, has been discovered in 99 million-year-old Kachin amber, offering new insights into their evolutionary path.
- Phylogenetic analysis shows that Varcalium is part of the Scirtinae crown-group, indicating that this group had begun to diversify as early as the mid-Cretaceous period.
Article Abstract
As one of the earliest-diverging lineage of the megadiverse beetle suborder Polyphaga, marsh beetles (Scirtidae) are crucial for reconstructing the ancestor of all polyphagan beetles and the ecomorphological underpinnings of their remarkable evolutionary success. The phylogeny of marsh beetles has nonetheless remained challenging to infer, not least because of their fragmentary Mesozoic fossil record. Here we describe a new scirtid beetle genus and species, Varcalium lawrencei gen. et sp. nov., preserving internal tissue, from Albian-Cenomanian Kachin amber (ca 99 Ma), representing the second member of this family known from the deposit. Based on a formal morphological phylogenetic analysis, Varcalium is recovered within the crown-group of Scirtinae, forming a clade with other genera that possess subocular carinae. The finding suggests that the crown-group of Scirtinae has already diversified by the mid-Cretaceous.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9352693 | PMC |
| http://dx.doi.org/10.1038/s41598-022-16822-y | DOI Listing |
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