Post #4111880
2026-07-26 06:33 UTC
sponges and cnidarians beat them to it, 500-600million years. and jellyfish have been exploding in numbers all over due to temperature rises, generally more tolerant to pollution than fishes, and lack of too many predators.
Replies (1)
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@binux@sh.itjust.works 2026-07-26 12:33
Those aren’t quite as specified as horseshoe crabs though (which are a taxonomic family, just above genus and species respectively). Sponges and jellyfish are both much more varied and encompass more than one class. Similarly I can say that Reptiles beat horseshoe crabs since they’ve been around at least ~50 mya longer than the latter, but that wouldn’t really be a fair comparison because they encompass far more species than just horseshoe crabs. Regarding lasting a long time evolutionarily while staying relatively the same, horseshoe crabs are still uniquely notable. They aren’t called living fossils for nothing.