Tagasi otsingusse
Peel, 2020

The Dala thumb: shell morphology and failed predation in Pollicina cyathina (Gastropoda) from the Ordovician of Dalarna, Sweden

Peel, J. S.
DOI
DOI10.1080/11035897.2020.1728374
Aasta2020
AjakiriGFF
Köide142
Number2
Leheküljed139-146
Tüüpartikkel ajakirjas
Keelinglise
Id22171

Abstrakt

The distinctive, tall and slender cyrtoconic shell of the gastropod Pollicina cyathina Koken, 1897, originally established on a poorly preserved internal mould from the Middle Ordovician of the Dalarna region of central Sweden, is redescribed on the basis of additional material from several localities in the vicinity of Rättvik. Repaired injuries preserved in the fine comarginal growth lines of the archinacelloidean gastropod indicate failed durophagous predatory attacks. Unusual apical structures on an internal mould from Sjurberg probably result from closure of the earliest growth stages later in ontogeny.

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