🧵 animal sperm theory (why there is weird similarities)

Anonymous at Fri, 12 Jul 2024 21:41:24 UTC No. 16279405

here's an idea why there are weird similarities across wild number of different animal phyla

1. fish has a tail with fin
2. lobster has a tail with fin

the reason? 700 million years ago fish sperm was able to fertilize lobster eggs

HOWEVER fish eggs has not been compatible wit non-deuterostome animals for nearly a billion years but it instantly developed a defense mechanism against wrong sperm

other animals (which are not deuterostomes but instead protostomes) did not develop egg-sperm protection until about 500 million years ago so they had 200 million years time period of getting fertilized by anything

the resulting horrendous cross breeds has given us these unholy animals:

-insects (descendants of lobsters)
-polychaete sea worms (ancestors of centipedes)
-octopus (a cross between human and a starfish)
-centipedes
-snails

these animals are however pure:
-spiders
-harvestmen