TORNQUISTES-HELVETICUS (JEANNET, 1951) (A MMONITINA, PACHYCERATIDAE) FROM THE EARLY OXFORDIAN OF THE SWISS JURA, NOM NOV PRO HERZNACHITES-HELVETICUS JEANNET, 1951

Authors
GYGI RA MARCHAND D THIERRY J
Citation
Ra. Gygi et al., TORNQUISTES-HELVETICUS (JEANNET, 1951) (A MMONITINA, PACHYCERATIDAE) FROM THE EARLY OXFORDIAN OF THE SWISS JURA, NOM NOV PRO HERZNACHITES-HELVETICUS JEANNET, 1951, Geobios, 27(4), 1994, pp. 459-466
Citations number
NO
Categorie Soggetti
Paleontology
Journal title
Geobios → ACNP
ISSN journal
00166995
Volume
27
Issue
4
Year of publication
1994
Pages
459 - 466
Database
ISI
SICI code
0016-6995(1994)27:4<459:T(1(MP>2.0.ZU;2-V
Abstract
The genus Herznachites Jeannet, 1951 is revised. It cannot be assigned to the family Oppeliidae as Jeannet believed. The result of a morphol ogical analysis of the only specimen available to Jeannet is that it m ust be assigned to the genus Tornquistes of the family Pachyceratidae. The holotype of Tornquistes helveticus (Jeannet) is a macroconch. Ano ther specimen that was found later is a microconch of the same species . The new specimen was found in situ and makes it possible to fix the age of the species to be of the Cordatum Subzone of the Cordatum Zone in the Early Oxfordian.