Resembling or characteristic of bactrites, particularly in having a straight, rod-like shell structure.
From 'bactrite' plus the Greek suffix '-oid' meaning 'resembling' or 'having the form of,' creating an adjective to describe similar forms.
Scientists use 'bactritoid' to describe other extinct creatures that independently evolved straight shells—it's a great example of convergent evolution, where different species solve the same problem the same way!
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