The Case of the Carnian(Triassic) Conodont Genus Metapolygnathus Hayashi  

作　　者：Ali Murat Kili Pablo Plasencia Keisuke Ishida Francis Hirsch 

机构地区：[1]Department of Geological Engineering, Balikesir University [2]Department of Geology and ICBIBE, University of Valencia,Dr. Moliner 50. 46100, Burjassot, Spain [3]Laboratory of Geology, Faculty of Sciences, Tokushima University [4]Laboratory of Geology, Faculty of Sciences, Naruto University

出　　处：《Journal of Earth Science》2015年第2期219-223,共5页地球科学学刊（英文版）

摘　　要：Successive evolutionary trends control the genera Paragondolella Mosher and Meta- polygnathus Hayashi over the about 20 Ma long Aegean-Tuvalian timespan. In consideration of their evolutionary criteria, these genera have been retained together with Carnepigondolella Kozur and the two new genera proposed herein, MazzaeUa （type species M. carnica） and Hayashiella （type species H. nodosa）. Mazzaella n. gen. represents a Late Julian side branch ofMetapolygnathus, harbouring a platform ornamentation similar to the several million years younger Tuvalian lineage of Carnepigondolella, issued from Hayashiella n. gen. that is intermediary between Metapolygnathus and CarnepigondoleUa, based on appearance and platform ornamentation.Successive evolutionary trends control the genera Paragondolella Mosher and Meta- polygnathus Hayashi over the about 20 Ma long Aegean-Tuvalian timespan. In consideration of their evolutionary criteria, these genera have been retained together with Carnepigondolella Kozur and the two new genera proposed herein, MazzaeUa （type species M. carnica） and Hayashiella （type species H. nodosa）. Mazzaella n. gen. represents a Late Julian side branch ofMetapolygnathus, harbouring a platform ornamentation similar to the several million years younger Tuvalian lineage of Carnepigondolella, issued from Hayashiella n. gen. that is intermediary between Metapolygnathus and CarnepigondoleUa, based on appearance and platform ornamentation.

关 键 词：CARNIAN CONODONT PHYLOGENY evolutionary trend. 

分 类 号：Q913.2[天文地球—古生物学与地层学]