Graptolithina

Xiphograptus Cooper et Fortey, 1982

Selection of related publications
Maletz, J. 2010. Xiphograptus and the evolution of virgella-bearing graptoloids. Palaeontology 53, 2, 415-439. DOI:10.1111/j.1475-4983.2010.00940.x
Maletz, J. 2005. Early Middle Ordovician graptolite biostratigraphy of the Lovisefred and Albjära drill cores (Scania, southern Sweden). Palaeontology 48, 4, 763-780. DOI:10.1111/j.1475-4983.2005.00482.x
Maletz, J. 1997. Graptolites from the Nicholsonograptus fasciculatus and Pterograptus elegans Zones (Abereiddian, Ordovician) of the Oslo Region, Norway. Greifswalder Geowissenschaftliche Beiträge 4, 5-98.
Skevington, D. 1965. Graptolites from the Ontikan Limestones (Ordovician) of Öland, Sweden. II. Graptoloidea and Graptovermida. Bulletin of the Geological Institutions of the University of Uppsala 43, 1-74.