Editing Radula (section)

== In cephalopods ==
[[File:Illex illecebrosus teeth.jpg|thumb|Radular teeth of the squid ''[[Illex illecebrosus]]'']]
Most [[cephalopod]]s possess a radula as well as a horny [[chitin]]ous [[cephalopod beak|beak]],<ref name=Brusca>{{bruscabrusca}}</ref> although the radula is reduced in [[octopus]]es and absent in ''[[Spirula]]''.<ref>{{The Mollusca|volume=12}}</ref>{{rp|110}}

The cephalopod radula rarely fossilizes: it has been found in around one in five [[ammonite]] genera, and is rarer still in non-ammonoid forms.  Indeed, it is known from only three non-ammonoid taxa in the Palaeozoic era: ''[[Michelinoceras]]'', ''[[Paleocadmus]]'', and an unnamed species from the [[Soom Shale]].<ref name="Gabbott1999">{{Cite journal | last1 = Gabbott | first1 = S. E. | title = Orthoconic cephalopods and associated fauna from the late Ordovician Soom Shale Lagerstatte, South Africa | journal = Palaeontology | volume = 42 | pages = 123–148 | year = 1999 | issue = 1 | doi = 10.1111/1475-4983.00065 | bibcode = 1999Palgy..42..123G | doi-access = free }}</ref>
{{Expand section|date=September 2008}}