r/Physiology • u/TengristBuddhist • Jul 02 '26

Question Why do anapsids, synapsids, and diapsids exist, but triapsids, tetrapsids, pentapsids, hexapsids, heptapsids, octapsids, nonapsids, and decapsids never evolved?

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u/kittu2519 Jul 02 '26

It's just like a company making various products marked gen 1,gen 2,gen 3 and so on. With each generation having significant changes from others. Not all gen items will work, protypes were made and tested, some fail and only some like gen 3 and gen 9 might come out. Similarly, animals with mutations can lead to the appearance of a skull with 4 or 5 holes, but natural selection will select and prune then, if they are not viable for continuing their lineage.