The apparatus of panderodontid conodonts

Autor:	Daniel Drygant, Jerzy Dzik
Rok vydání:	1986
Předmět:	Cusp (singularity) Paleontology biology Curvature Conodont biology.organism_classification Ecology Evolution Behavior and Systematics Geology
Zdroj:	Lethaia. 19:133-141
ISSN:	1502-3931 0024-1164
DOI:	10.1111/j.1502-3931.1986.tb00723.x
Popis:	A cluster of thirteen elements of Panderodus unicosfatus (Branson & Mehl) from the Llandoverian of Po-dolia, Ukraine, is shown to represent an almost complete apparatus; only one element is lacking. The restored original arrangement of the elements is consistent with the model of the conodont apparatus with seven pairs of elements ordered in two parallel rows, with cusps opposing in every pair. The apparatus of Panderodus is closely similar to that of the Cambrian ‘protoconcdonts’ and their Recent chaetognath successors. Nevertheless, general trends in the evolution of elements of the Panderodontidae towards increased elongation, smoothness of the cusp curvature, and depth of the basal cavity indicate that the grasping apparatus of Panderodus developed independently of, and convergently to, that of the Chaetog-natha.
Databáze:	OpenAIRE
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