An individual organism belonging to the phylum Gasterotricha, or an adjective describing something related to these tiny animals.
Derived from 'Gasterotricha' with the suffix '-an' (relating to or belonging to). Used interchangeably as a noun for individual members or as an adjective in scientific descriptions.
If you looked at pond water under a microscope, you'd see gasterotrichans bustling around, and they're so weird that when first discovered, scientists couldn't figure out what they were!
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