Graptolithina

Discograptus Wiman, 1901

Selection of related publications
Mierzejewski, P. 1978. Tuboid graptolites from erratic boulders of Poland. Acta Palaeontologica Polonica 23, 4, 557-574.
Bulman, O. M. B., Rickards, R. B. 1966. A Revision of Wiman's Dendroid and Tuboid Graptolites. Bulletin of Geological Institutions of the University of Uppsala 43, 6-8, 1-72.
References based on distribution