The discovery of Litoria Tylerantiqua indicates that Australian tree frogs (Perodrius) were already present in Australia when the continent was still attached to Antarctica and South America.
Artist Reconstruction of Litoria Tylerantiqua (right) alongside the previously described species Platyplectrum casca (left) from Margon in southeast Queensland. Image: Samantha Yabsley, https://www.instagram.com/shy_art.
Litoria Tylerantiqua lived in Australia during the early Eocene period, approximately 55 million years ago.
The fossilized frog bones were retrieved in the 1990s by paleontologists at the University of New South Wales while screenwashing clay samples from the Tingamara fossil frog site in Margon, Queensland.
“About 55 million years ago, Australia, Antarctica, and South America were connected as the last remnants of Gondwana,” stated Dr. Roy Furman and his colleagues at the University of New South Wales and the Australian National University.
“During this era, the global climate was warmer, facilitating forested corridors linking South America and Australia.”
“Previously, Australia’s oldest tree frogs were believed to have originated from the late Illuminocene (around 26 million years ago) and the early Miocene (approximately 23 million years ago).”
“Fossils from the late Illuminocene have been discovered in the Northern Territory’s kangaroo wells and the Etadunna formation in Lake Palancarina, South Australia. Furthermore, the Riversley World Heritage Area in Queensland unveiled an early Miocene tree frog.”
“This new species extends the fossil record of Perodrids by roughly 30 million years, bringing it closer to the timeframe when Australian tree frogs diverged from their South American counterparts,” they noted.
“Previous estimates based on molecular clock analyses suggest that Australian and South American frogs diverged approximately 33 million years ago.”
Litoria Tylerantiqua is the only other known frog from Margon, also identified as Platyplectrum casca (previously categorized as Lechriodus Casca), recognized as the oldest frog species in Australia.
Both have existing relatives in Australia and New Guinea, showcasing incredible resilience over time.
“Despite their fragile nature, these frogs have surprisingly thrived, surviving numerous major extinction events since their origin around 250 million years ago.”
“Current global extinction threats, fueled by human activities like rapid climate change and the proliferation of pathogenic bacteria, pose significant challenges for frogs. The fossil record reveals how certain frog groups have navigated past adversities, potentially by adapting to less-threatened habitats.”
“This insight might guide future conservation efforts, such as relocating endangered frogs to safer environments.”
One such species, the Southern Corroboree Frog (Pseudophryne corroboree), is currently endangered due to habitat hostility caused by climate change.
“If fossil records show similarly structured frogs occupying very different habitats, today’s frogs could potentially benefit from reintroductions into comparable environments.”
The findings are detailed in a study published in the Journal of Vertebrate Paleontology.
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Roy M. Furman et al. New fossil discoveries for early Eocene perodrids from local faunas of Southeast Queensland, Margon, Tingamara, and frog molecular lineages. Journal of Vertebrate Paleontology published online on May 14, 2025. doi:10.1080/02724634.2025.2477815
Source: www.sci.news
