Happlodontus

They are passively mobile organisms.

URI: http://eol.org/schema/terms/passivelyMobile
Definition: Organisms that are mobile but do not move actively, e.g., floating organisms and epibionts on living mobile organisms.
Attribution: http://paleodb.org/public/tips/ecology_tips.html

EOL has data for 6 attributes, including:

ecomorphological guild
- URI: http://eol.org/schema/terms/EcomorphologicalGuild
- Definition: organisms that share certain morphological traits due to adaptation to similar environments and ecological roles
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epifaunal
- URI: http://www.marinespecies.org/traits/Epifaunal
- Definition: An animal living on the surface of the substratum.
- Attribution: http://www.marinespecies.org/traits/wiki/Traits:Epifaunal
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first appearance
- URI: http://eol.org/schema/terms/FossilFirst
- Definition: The first appearance of this taxon in the fossil record.
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520 million years ago
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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5