Patterns of diversity, extinction and origination in the Ordovician‐Devonian stropheodontacea

摘要: Evolutionary patterns exhibited by ninety‐one genera and subgenera of Ordovician‐Devonian Stropheodontacea can be inferred using two measures standing diversity, along with raw three each extinction rates, origination rates turnover rates. Of the defined for type rate, one counts taxa that are confined to interval do not. latter, is on a pertotal per‐standing‐diversity basis. If it assumed available data adequately represents total range morphological diversity time distribution Stropheodontacea, then these treated as descriptive statistics several emerge: Diversity increases monotonically from Caradoc Emsian decreases zero in Famennian. Extinction increase Wenlock Frasnian. Origination show four peaks. Turnover decrease Early Silurian, local peak Wenlock,...