Editing Endocerida (section)

==Diversity==
Endocerids were among some half a dozen cephalopod orders that appeared in the Lower Ordovician. They reached their greatest diversity during the Lower to Mid-Ordovician, but were already in decline by the middle of this period with most genera becoming extinct by the end of the [[Sandbian]] (late Ordovician), while some rare hangers on lasted into the [[Silurian]].<ref name='Barskov2008'>{{cite journal
 | doi = 10.1134/S0031030108110014
 | title = Cephalopods in the marine ecosystems of the Paleozoic
 | year = 2008
 | author = Barskov, I. S.
 | journal = Paleontological Journal
 | volume = 42
 | pages = 1167
 | last2 = Boiko
 | first2 = M. S.
 | last3 = Konovalova
 | first3 = V. A.
 | last4 = Leonova
 | first4 = T. B.
 | last5 = Nikolaeva
 | first5 = S. V.
 | issue = 11 | s2cid = 83608661
 }}</ref>  In any case, the endocerid lineage became completely extinct relatively early on in cephalopod history.