Answer: tardigrade

AnswerCrossword Clue
tardigradeany microscopic, chiefly herbivorous invertebrate of the phylum Tardigrada, living in water, on mosses, lichens, etc.
tardigradean arthropod with eight legs living in water or damp moss
tardigradeslow in pace or movement.
tardigradeslow in pace or movement
tardigradebelonging or pertaining to the phylum Tardigrada