Acta
Palaeontologica Polonica
47, 565-650 (2002). Jerzy Dzik Abstract.
The dominant factor
in faunal succession of conodonts in the Frasnian of Poland is the apparent
immigration of species originating allopatrically in other regions. Each
immigration event usually changes the population variability of a local
species (character displacement). Only a few lineages show their phyletic
evolution within the studied area. Attempts to distinguish conodont species on
the basis of platform element shape failed in some of the latest Frasnian
palmatolepidids. Even at the apparatus-based generic level, certain ramiform
elements of the apparatus appear much more diagnostic than the platforms.
Correlative value of the late Frasnian palmatolepidids of unknown apparatus
structure is thus questionable. The evolution of platform elements in Ancyrodella
offers a more solid basis for age determination although their great
population variability makes resolution rather low and requires the population
approach. The panderodontids Belodella(?)
tenuiserrata sp. n., B.
minutidentata sp. n., B.
robustidentata sp. n., prioniodontid Icriodus
kielcensis sp. n., enigmatic monospecific Playfordiidae fam. n.,
prioniodinids Dyminodina planidentata gen. et sp. n., D. anterodenticulata sp. n., D.
kovalensis sp. n., Pluckidina
kielcensis gen. et sp. n., P. slupiensis
sp. n., P. robustipegmata sp. n., and P.
lagoviensis sp. n., derived polygnathid Avignathus
bifurcatus sp. n., probably secondarily simplified polygnathid
Nicollidina gen. n., and palmatolepidids Kielcelepis
gen. n., Lagovilepis gen. n. and Klapperilepis
gen. n. are proposed. |