A subclass of extinct marine animals, including sea pens and related colonial organisms, characterized by branching, tree-like structures.
From Greek 'dendron' (tree) + '-oidea' (a taxonomic suffix). This scientific classification term was established to group organisms with conspicuous tree-like morphology.
Dendroidea fossils are like time capsules from the Paleozoic seas—some of these creatures were so efficient at catching food with their branching arms that similar designs evolved in completely different modern animals!
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