Resembling or relating to the cassidulina foraminifera or similar helmet-shaped microscopic organisms.
From cassidulina plus -oid, meaning 'resembling' or 'having the characteristics of,' a common suffix in scientific descriptions.
Under an electron microscope, these organisms look like tiny alien space helmets with pores—their design is so perfect for filtering food that it hasn't changed much in 50 million years!
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