(Of a plant, marine invertebrate, or structure) tree-shaped; branching.
- The intermediate-level benthos was dominated by sponges, corals, giant bivalves, giant brachiopods, stalked echinoderms and fixed dendroid graptolites.
- Further, older autozooids in major proximal regions of some large dendroid colonies stopped growing skeletons outwardly as distal colony growth continued.
- Many dendroid colonies in lower Paleozoic trepostomes developed narrow exozones of young presumably feeding autozooids in cycles that covered growing branch tips.
A graptolite of a type that formed much-branched colonies, found chiefly in the Ordovician and Silurian periods.
- Order Dendroidea, class Graptolithina.
- In the Early Ordovician, many-branched planktonic forms developed from the attached dendroids.
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