Editing Endocerida (section)

== Ecology==
[[File:Endoceras sp.png|left|thumb|Life restoration of ''Endoceras'']]
The mode of life of endocerids is debated.<ref name=Mironenko2018/> Endocerids may have been the [[apex predator]]s of the Ordovician, probably living close to the sea floor, and preying on [[trilobite]]s, molluscs, [[brachiopod]]s and other bottom-dwelling organisms.<ref name=Kroger2009/> They were probably not active [[nekton]]ic swimmers, but rather crawled over the floor of epicontinental seas or lay there in ambush.{{Citation needed|date=July 2018}} Although there is study that supports [[Filter feeder|filter feeding]] ecology,<ref name=Mironenko2018/> according to [[Hydrostatics|hydrostatic]] properties, it is not likely and still supports benthic predators.<ref>{{Cite journal |last1=Peterman |first1=David J. |last2=Barton |first2=Christopher C. |last3=Yacobucci |first3=Margaret M. |date=2019-05-21 |title=The hydrostatics of Paleozoic ectocochleate cephalopods (Nautiloidea and Endoceratoidea) with implications for modes of life and early colonization of the pelagic zone |url=https://palaeo-electronica.org/content/2019/2521-cephalopod-hydrostatics |journal=Palaeontologia Electronica |language=English |volume=22 |issue=2 |pages=1–29 |doi=10.26879/884 |s2cid=181794320 |issn=1094-8074|doi-access=free }}</ref>

===Reproduction===

Endocerids laid relatively large eggs, and hatched at a relatively large body size.<ref name=Laptikhovsky2018/> It is likely that endocerids were [[demersal]] after hatching, as large eggs would make an easy target for predators in the pelagic zone.<ref name=Laptikhovsky2018/> Endocerids may have migrated from their habitat in the open ocean to shallower water to lay their eggs.<ref name=Mironenko2018/>