AI Article Synopsis
- - A new beetle species, Rhantus villumi sp. nov., has been identified from a single specimen found in the Fur Formation of Denmark, dating back about 55.4 million years to the early Eocene, making it the oldest known member of its genus.
- - The discovery aligns with phylogenetic studies and suggests that the presence of this temperate beetle in a typically warm environment indicates potential short-term cooling trends during that period.
- - The newly identified species might have fed on mosquito larvae, which have also been found in the same fossil site; however, another Dytiscidae species was noted but remains unidentified due to preservation issues.
Article Abstract
†Rhantus villumi sp. nov. is described and illustrated on the basis of a single specimen from the earliest Eocene Fur Formation, Denmark. With an estimated age of ca. 55.4 Ma, it represents the oldest member of an extant genus of the family Dytiscidae. However, the presence of Rhantus in the early Eocene is only slightly older than previous estimates, and generally agrees well with phylogenetic analyses of the subfamily Colymbetinae. The presence of a predominantly temperate genus in the presumably warm Lagerstätte is briefly discussed, supporting the hypothesis of temporary cooling, as suggested by several other invertebrate records from the Fur Formation. It is suggested that the new species could feed on mosquito larvae, which are known from the Lagerstätte. Finally, a record of another Dytiscidae species from the same locality is mentioned, but, due to poor preservation and lack of diagnostic characters, this fossil remains unidentified to genus or species level.
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| http://dx.doi.org/10.11646/zootaxa.5458.2.5 | DOI Listing |
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