Comparative anatomy and developmental series show that gar and teleosts share a hypural-diastema complex while leaving its homology and evolutionary route unresolved.
Represented range0–0 Ma
RegionsExtant comparative developmental and anatomical sample
Comparative anatomy and development show a hypural-diastema complex in gars and teleosts and an early role for caudal fin rays in external symmetry, so the complete complex cannot be treated as an unconditional teleost synapomorphy; descent, loss and latent parallelism remain competing histories.