Encrusta

They are sessile organisms.

URI: http://www.wikidata.org/entity/Q1759860
Definition: organisms that do not possess a means of self-locomotion and are normally immobile

EOL has data for 5 attributes, including:

first appearance
- URI: http://eol.org/schema/terms/FossilFirst
- Definition: The first appearance of this taxon in the fossil record.
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530 million years ago
motility
- URI: http://www.wikidata.org/entity/Q33596
- Definition: ability to move spontaneously and actively, consuming energy in the process
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sessile
- URI: http://www.wikidata.org/entity/Q1759860
- Definition: organisms that do not possess a means of self-locomotion and are normally immobile
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number of fossil occurrences
- URI: http://eol.org/schema/terms/fossilOccPBDB
- Definition: The number of fossil occurrences in the Paleobiology Database (https://paleobiodb.org) that are identified as belonging to a particular taxon or any of its subtaxa.
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1