FOREL, M.-B., CRASQUIN, S., CHITNARIN, A., ANGIOLINI, L., GAETANI, M. 2015. Precocious sexual dimorphism and the Lilliput effect in Neo-Tethyan Ostracoda (Crustacea) through the Permian–Triassic boundar. Palaeontology, 58, 3, 409–454.
Marie-Béatrice Forel, Sylvie Crasquin, Anisong Chitnarin, Lucia Angiolini and Maurizio Gaetani- Marie-Béatrice Forel - State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China (email: mbforel@yahoo.fr)
- Sylvie Crasquin - CR2P CNRS – UPMC – MNHN, Sorbonne Universités, Paris Cedex 05, France (email: sylvie.crasquin@upmc.fr)
- Anisong Chitnarin - School of Geotechnology, Institute of Engineering, Suranaree University of Technology, Mueang District, Nakhon Ratchasima Province, Thailand (email: anisong@sut.ac.th)
- Lucia Angiolini - Dipartimento di Scienze della Terra, Università di Milano, Milano, Italy (email: lucia.angiolini@unimi.it)
- Maurizio Gaetani - Dipartimento di Scienze della Terra, Università di Milano, Milano, Italy (email: maurizio.gaetani@unimi.it)
- Issue published online: 21 APR 2015
- Article first published online: 25 FEB 2015
- Manuscript Accepted: 24 DEC 2014
- Manuscript Received: 13 AUG 2014
The Elikah River section spanning the Lopingian (Late Permian) to the Griesbachian (Early Triassic) time interval in the Central Alborz Mountains (north Iran) was sampled for ostracod analysis. We report 79 species distributed among 38 genera. Four new species are described: Acratia? pervagata Forel sp. nov., Microcheilinella alborzella Forel sp. nov., Basslerella superarella Crasquin sp. nov. and Cavellina nesenensis Crasquin sp. nov. The ontogeny of 13 species is described and sexual dimorphism in the genus Microcheilinella is here undoubtedly recognized for the first time. Six species show precocious sexual dimorphism of their carapace as early as A-5 juvenile. The Lilliput effect is for the first time recorded and quantified for two species. Rare long-time span Palaeocopida species, known throughout the entire Permian, document relatively long-term evolution, including the size and growth rate modifications associated with the earlier appearance of carapace sexual dimorphism through time. These patterns might be related to the Guadalupian–Lopingian events and/or to climatic modifications occurring during the Permian interval.
Higher resolution versions of Figures 3 http://onlinelibrary.wiley.com/store/10.1111/pala.12151/asset/supinfo/pala12151… Higher resolution versions of Figures 5 http://onlinelibrary.wiley.com/store/10.1111/pala.12151/asset/supinfo/pala12151… Higher resolution versions of Figures 7 http://onlinelibrary.wiley.com/store/10.1111/pala.12151/asset/supinfo/pala12151… Higher resolution versions of Figures 11 http://onlinelibrary.wiley.com/store/10.1111/pala.12151/asset/supinfo/pala12151… Higher resolution versions of Figures 17 http://onlinelibrary.wiley.com/store/10.1111/pala.12151/asset/supinfo/pala12151… Higher resolution versions of Figures 22 http://onlinelibrary.wiley.com/store/10.1111/pala.12151/asset/supinfo/pala12151… Wiley Online Library