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About: Olenellina     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.org associated with source document(s)

Type: animalyago:WikicatCambrianAnimalsyago:WikicatCambrianTrilobitesyago:WikicatTrilobitesyago:Animal100015388yago:Arthropod101767661yago:Invertebrate101905661yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930insectyago:Trilobite101768244yago:Whole100003553 New Facet based on Instances of this Class

Olenellina is a suborder of the order Redlichiida of trilobites that occurs about halfway during the Lower Cambrian, at the start of the stage called the Atdabanian. The earliest trilobites in the fossil record are arguably Olenellina, although the earliest Redlichiina and Eodiscina follow quickly. The suborder died out when the Lower passed into the Middle Cambrian, at the end of the stage called Toyonian. A feature uniting the Olenellina is the lack of rupture lines (or sutures) in the headshield, which in other trilobites assist the periodic moulting (or ecdysis), associated with arthropod growth. Some derived trilobites have lost facial sutures again (some Eodiscina, all , and a few Phacopina), but all of these are blind, while all Olenellina have eyes.