Contribution
Gigantism in Late Devonian ammonoids from Chahriseh (Central Iran)
Korn, Dieter; Hairapetian, Vachik; Gholamalian, Hossein
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 297 Heft 3 (2020), p. 287 - 294
48 références bibliographiques
publié: Sep 21, 2020
manuscrit accepté: Jun 14, 2020
manuscrit reçu: Apr 11, 2020
ArtNo. ESP155029703001, Prix: 29.00 €
Abstract
Gigantic representatives of the clymeniid genera Hoevelia and Protactoclymenia (Late Devonian ammonoids) with conch sizes up to 50 cm occur in small numbers in shallow-water carbonates at Chahriseh (Central Iran). Comparison with other occurrences of gigantic clymeniids (Central Europe, North Africa) suggests that taphonomic reasons rather than latitudinal effects with differences in sea water temperature and oxygen availability are responsible for this gigantism. The large size of the ammonoids at Chahriseh is interpreted as local phenomenon caused by accumulation of post-mortem drifted specimens. The new species Hoevelia megalomanica is described.
Mots-clefs
Ammonoidea • Clymeniida • Late Devonian • gigantism • Iran