Acta Palaeontologica Polonica

New aberrant sessile graptolites from glacial boulders

Piotr Mierzejewski

Acta Palaeontologica Polonica 30 (3-4), 1985: 191-199

Two new aberrant sessile graptolites from glacial boulders are described. The Silurian form, Urbanekicrusta reversa gen. et sp.n., is interpreted as a crustoid (hormograptid?) graptolite, whereas the Ordovician (?), Maenniligraptus ursulae gen. et sp.n., represents presumably an unknown order of Graptolithina.

Key words: graptolites, taxonomy, glacial boulders, Ordovician, Silurian, Poland.

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