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Significance of the ligament area in species level taxonomy of inoceramid bivalves; how much variation is lodged in a single species?

by Ireneusz Walaszczyk, Warsaw

WALASZCZYK, I. (1997): Significance of the ligament area in species level taxonomy of inoceramid bivalves; how much variation is lodged in a single species?. - Freiberger Forschungshefte C 468. - Paläontologie, Stratigraphie, Fazies, Heft 5. - S. 289-303. - Freiberg 1997.

Abstract

Analysis of the sample of inoceramid species referred to Tethyoceramus madagascariensis (HEINZ), with preserved ligamentarium, shows its considerable variability in respect of the ligament area. Within the material comprising 20 specimens at least 4 different types of the ligament area can be distinguished. Partly only, the observed variability can be explained by the ontogenetic modifications of the ligament area. The presence of the completely different types remains unclear and requires much more data on the limits and possible causes of the variability of the ligament area.