Animals with high metabolic rates, well-developed respiratory systems, and non-calcareous hard parts had negligible losses—except for conodonts, in which 33% of genera died out.
Životinje sa dobro razvijenim stopama metabolizma, respiratornih sustava i tvrdih dijelova bez vapnenca su imale zanemarive gubitke—izuzev konodonta kod kojih je 33% rodova izumrlo.