Fossil findings at Lightning Ridge unveiled previously unknown species of teeth-bearing monotremes similar to a blend of echidna and platypus, hinting at diverse evolutionary past.
Opalios spendens, labeled as 'echidnapus,' showcases features of both platypus and echidna, possibly evolving before their common ancestor, adding to the diversity of monotremes.
[This is] the most diverse monotreme assemblage on record, indicating a past where monotremes rivalled the commonness of marsupials in Australia.
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