Editing Nectocaris (section)

== Diversity ==
Although ''Nectocaris'' is known from Canada, China and Australia, in rocks spanning some 20&nbsp;million years, there does not seem to be much diversity; size excepted, all specimens are anatomically very similar.  Historically, three genera have been erected for nectocaridid taxa from different localities, but these 'species' – ''Petalilium latus'' and ''Vetustovermis planus'' – likely belong to the same genus or even the same species as ''N.&nbsp;pteryx''. Within ''N.&nbsp;pteryx'', there seem to be two discrete morphs, one large (~10&nbsp;cm in length), one small (~3&nbsp;cm long). These perhaps represent [[sexual dimorphism|separate male and female forms]].<ref name="Smith2013c"/>