this is terrifying -- the mouth structures of chaetognaths (also known as "arrow worms") . source: Theusen et al. 1988 https://t.co/FutCaOLZ0R https://t.co/Yfd9z4gCOi

@fishspeciation Sorry, I meant to include some sources They have bacteria that produce TTX: Kungsuwan et al. 1987 https://t.co/cbnVOWiVvz They are also somewhat insensitive to TTX: Ho et al 1994 https://t.co/NsBqMoaWOA