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Vinn et al., 2017b

The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of Estonia

Vinn, O., Toom, U., Isakar, M.
DOI10.3176/earth.2017.19
Aasta2017
AjakiriEstonian Journal of Earth Sciences
Köide66
Number4
Leheküljed193-197
Tüüpartikkel ajakirjas
Joonised2
OpenAccess
LitsentsCC BY 4.0
Eesti autor
Keelinglise
Id6562

Abstrakt

The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group. The encrusted trilobites are rare in the Ordovician of Estonia. Illaenid pygidia and cranidia were encrusted by cornulitids and trepostome bryozoans. The encrustation of both Middle Ordovician and Late Ordovician trilobites took place post mortem. The studied hard substrate communities of Middle Ordovician and Late Ordovician trilobite pygidia and cranidia are typical of the Ordovician.

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