🧵 So how did centipedes end up on land?

Anonymous at Wed, 8 May 2024 11:51:18 UTC No. 16165660

There are no sea centipedes so how come there are land centipedes?

Is it possible that ONLY TWO arthropod groups arrived on land, 440 million years ago?

440 million years ago
group 1: sea scorpion
-while sea scorpiones eventually all went extinct on the sea during hundred million years, their land relatives survived
-their offspringe are land scorpions, mites, spiders, dust mites, harvestmen

440 million years ago
group 2: pill bug like crustacean related to shrimp
-evolves into centipedes
-evolves into velvet worms (velvet worms further evolve into insects but their ancestral form didnt disappear)
-first insect is silverfish, looks a lot like pillbug in a way
-does not evolve into land crustaceans

150 million years ago, so it is recent attempt!
another group of crustaceans, a long lineage of lobsters make a landing
-they evolve into freshwater crabs
-they evolve into coconut crab (completely terrestrial and has lungs)

compared to vertebrates, arthropods landed twice or even three times, all from different groups of arthropods

the original sea ancestor of sea scorpions and crustaceans lived 1 billion years ago and was a worm, this means the two arthropod groups have had unimaginable amount of time passed after they split