Skip to main content

Gastropods from the Late Triassic Nayband Formation (Iran), their relationships to other Tethyan faunas and remarks on the Triassic gastropod body size problem

Buy Article:

$39.00 plus tax (Refund Policy)

A collection of marine gastropods from the Late Triassic (Rhaetian) Nayband Formation of Iran near Esfahan consists of 67 specimens representing 11 species (two species are new: Cryptaulax? hautmanni and Rhynchocerithium esfahanense). Species richness, diversity indices as well as rarefaction analysis suggest a comparatively low diversity. The gastropod fauna is dominated by two large caenogastropod species: Anulifera binodosa and Pseudokatosira? seminodosa which are both as high as 100 mm. The genus Anulifera is also abundant in the Dachsteinkalk of the Northern Calcareous Alps and has been reported from Southeast Asia. The size distribution pattern of gastropods in the Nayband Formation is compared with the size distribution of a collection from the Carnian Cassian Formation (N Italy, Southern Alps). The gastropods from the Cassian Formation are smaller than two centimetres. However, the Cassian gastropod fauna is not necessarily dwarfed or stunted because a small size is not unusual for gastropods and even the majority of extant gastropod species is smaller than 1-2 cm. This size range is also present in some Early Triassic gastropod faunas and this fact detracts from the significance of the so-called "Lilliput Effect". However, the absence of very large (> 5-10 cm) gastropods in Early Triassic faunas seems to be a correct observation ("Gulliver Absence Effect").
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics


Document Type: Research Article

Publication date: 2010-05-01

More about this publication?
  • Neues Jahrbuch für Geologie und Paläontologie continuously publishes current original contributions from all fields of geology, ever since its foundation in 1807. All published contributions are in the English language.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more