Sellate muscle scars and a mitral muscle-platform interpretation are assembled into a testable sessile bivalved model.
Represented range521–514.5 Ma
RegionsEarly Cambrian Arrowie Basin, South Australia
CladesBrachiopod origin dossier route · Micrina
Claim ledger
topology · medium
Mitral and sellate Micrina sclerites can be reconstructed as a near-bilaterally symmetrical sessile bivalved organism: sellate sclerites preserve paired muscle scars, while mitral apophyses are interpreted as muscle platforms. Valve homology and stem-brachiopod placement remain hypotheses rather than preserved articulation.