A group or classification of organisms related to graptolites, representing similar extinct colonial animals from ancient seas.
From graptolite + -oidea (suffix meaning 'resembling' or forming taxonomic groupings); Latin scientific naming convention for organism groups.
This is taxonomic shorthand that scientists use to group distant relatives—like how you might say 'primates' to include humans, apes, and lemurs without naming each one individually.
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