Rhynchaeites
genus of birds (fossil)
Rhynchaeites (Greek for "beak fossil") is an extinct genus of wading bird, a stem-group threshkiornithid, which lived in Europe and North America during the Eocene epoch. The genus contains three species, R. messelensis, R. litoralis and R. mcfaddeni. It is one of the oldest members of the ibis family known from fossil remains.
Taxonomy
The type species, R. messelensis, is known from many well-preserved specimens from the famous Lutetian-aged Messel pit of Germany. It was initially thought to represent an early relative of painted-snipes (family Rostratulidae), and was still considered an early charadriiform for nearly a century, but was identified as an early ibis in 1983.
In 2023, a second species, R. litoralis was described from the earlier Ypresian-aged London Clay of England. R. litoralis is mostly known from isolated bones but also multiple partial skeletons. In addition to their differing morphologies, both species appear to have inhabited different habitats, with R. messelensis inhabiting freshwater habitats and R. litoralis coastal habitats.
In 2026, a largely complete, articulated Rhynchaeites specimen from the Green River Formation of the United States was described as the holotype of a third species, R. mcfaddeni. The potential leg bone fossils of Rhynchaeites have also been found in the earliest Ypresian Fur Formation in Denmark.
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This entry incorporates text from “Rhynchaeites” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.