Originally Posted by
justinwwwallin
http:///forum/post/3232129
correct me if im wrong, but arent there a few different kind of horseshoe crabs?
i dont think the ones we can get in our aquariums are tbe ones that get that big.
not like the ones youd see coming up on shore on the east coast?
but thats just what i thought. so. im not sure
Of the phylum Arthropods, there are 4 classes underneath, Insecta, Arachnida, Crustacea, and Merostomata. I'm pretty pretty sure you know Insecta (insects), which there are over a 1,000,000 species. Arachnida (arachnids, spiders, scorpions,) with 70,000 speices, Crustacea (Crusteans, lobsters, crabs, shrimp) with 26,000 species. Then there's Merostomata, care to guess how many are in there? 4, yes, that's correct, 4. All various type of horseshoe crabs. Their closest relatives died over 544 millions ago. Of those 4 horseshoes, there is 1 Atlantic speices (Limulus polyphemus ), and 3 Indo-Pacific speices, Tachypleus gigas, Tachypleus tridentatus, and Carcinoscorpius rotundicauda. All 4, are very, very close, in terms, of size, behavior, and diet.
Tachypleus gigas 2ft
Limulus polyphemus 2ft
Tachypleus tridentatus 2ft
Carcinoscorpius rotundicauda 16" plus tail