Oligocene Ymboirana crown-caecilian candidate

CT-informed comparative anatomy identifies a partial caecilian skeleton as a provisional member of a living aquatic family.

Represented range27.82–23.03 Ma

RegionsTremembé Formation near Tremembé, São Paulo, Brazil

CladesYmboirana acrux · provisional Typhlonectidae

Claim ledger

taxonomy · low

CT-informed comparison of holotype DGM 1462-R supports an approximately 25 Ma aquatic caecilian assigned to Typhlonectidae, but damage, absent unambiguous family synapomorphies and pending formal phylogenetic testing make the crown placement provisional.

claim:event:oligocene-ymboirana-crown-caecilian

References

The first fossil record of an aquatic caecilian (Gymnophiona: Typhlonectidae)Santos, R.O.; Wilkinson, M.; Ribeiro, G.C.; Carvalho, A.B.; Zaher, H. · 2024 · DOI 10.1093/zoolinnean/zlad188

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