The Origin and Initial Rise of Pelagic Cephalopods in the Ordovician

The oldest cephalopods from east Laurentia

(2016) Ed Landing et al.   JOURNAL OF PALEONTOLOGY

A New Genus of Middle Tremadocian Orthoceratoids and the Early Ordovician Origin of Orthoceratoid Cephalopods

(2010) Björn Kröger   ACTA PALAEONTOLOGICA POLONICA

Discosorids and Oncocerids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups

(2009) Björn Kröger et al.   GEOBIOS

Pulsed cephalopod diversification during the Ordovician

(2009) Björn Kröger et al.   PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY

The Ordovician Biodiversification: revolution in the oceanic trophic chain

(2008) THOMAS SERVAIS et al.   LETHAIA

Isorthoceras wahlenbergi, a new Late Ordovician cephalopod from the Boda Limestone of Dalarna, Sweden

(2008) Shuji Niko   PALEONTOLOGICAL RESEARCH

Marine biodiversification in response to evolving phytoplankton stoichiometry

(2007) Ronald E. Martin et al.   PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY