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The curvature-transition series: integral part of some simple-cone conodont apparratuses (Panderodontacea, Distacodontacea, Conodontata)

100%

Fahraeus L. E., Hunter D. R.

Acta Palaeontologica Polonica

1985

tom 30

nr 3-4

Elements of species of Drepanoistodus Lindström, Panderodus Ethington, and Protopanderodus Lindström systematically vary from symmetrical to pronouncedly asymmetrical (symmetry-transition series) within each species, and a group of elements with systematic increase in curvature of the cusp can be recognized for each element type; each such group is named a curvature-transition series. Panderodus and Protopanderodus, both of the Panderodontacea, have essentially identical apparatuses with regard to symmetry and curvature-transition series whereas Drepanoistodus, of the Distacodontacea, differs in type of symmetry-transition series and number of curvature-transition series. The curvature-transition series is considered to represent a taxonomically distinct character at the suprageneric level.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Fahraeus L. E.

1 Hunter D. R.

1 1985

Wyniki wyszukiwania

The curvature-transition series: integral part of some simple-cone conodont apparratuses (Panderodontacea, Distacodontacea, Conodontata)