Table 2.

Decrease of maximum cephalopod size (to 50% or less of the pre-extinction maximum body size) following mass extinctions.? – poor data; yes – distinct effect; no – no or insignificant effect; extinction. The effects of mass extinctions can be seen best in Fig. 2.

Event	Orthocones	Nautilids	Ammonoids	Coleoids
End Cambrian	No	Does not apply	Does not apply	Does not apply
End Ordovician	Yes	Does not apply	Does not apply	Does not apply
Kellwasser	?	?	Yes	Does not apply
End Devonian	?	?	Yes	Does not apply
Permian-Triassic	?	No	Yes	?
End Triassic	Extinction	No	Yes	Yes?
End Cretaceous	Does not apply	No	Extinction	Yes