Killi
curve

Dorothy Latimer's original Sketch of Coelacanth.

DNA


aside
Hagfish
Placoderm Tiktaalik


bones
Costa2015

Osteology

(Introduction to ichthyological osteology)

As fish evolved so did skeletal changes and nowhere as quickly as in the jaws, head and bones that support the fins; today these are as if not more important as DNA evidence.


cichlid
Arbour2016
Meier_2017 midas

Evolution of Cichlids

By 250mya there were around 1200 species of fish. Between then and now around 27,000 species of fish evolved.




killifish
similar
ref



sticklebacks
fast_evo

Our multi finned brackish friend

As marine fish currently entering fresh waters sticklebacks are being studied to observe the micro-evolution demonstrable in contemporary time frames.








Encyclopedia Aquatica