Mann, A.; Reisz, R.R.
morphology · range · methods
The referred specimen is ROM VP 83326; the paper reports direct comparison with Echinerpeton paratype RM 10057 and type-series casts and photographs.
Referred specimen ROM VP 83326 documents a hyper-elongated neural spine in Echinerpeton intermedium from the Sydney Mines Formation, but incomplete preservation does not resolve the animal's full outline, spine ratio or sail function.
claim:event:echinerpeton-neural-spine-specimenEchinerpeton material from the 308.5–305.5 Ma Sydney Mines Formation anchors the 308.5–0 Ma Synapsida route; its ophiacodontid assignment is a matrix result and the sample is not the synapsid origin or a global FAD.
claim:taxon:synapsida:root-range