Fossil Liverworts from the Lower Cretaceous Huolinhe Formation in Inner Mongolia, China  

作　　者：LI Ruiyun WANG Xuelian JIN Peihong MA Fujun YAN Defei LIN Zhicheng SUN Bainian 

机构地区：[1]School of Earth Sciences&Key Laboratory of Mineral Resources in Western China(Gansu Province),Lanzhou University [2]Northwest University Museum,Northwest University [3]Key Laboratory of Economic Stratigraphy and Palaeogeography,Nanjing Institute of Geology and Palaeontology,CAS [4]School of Petroleum Engineering,Chongqing University of Science & Technology

出　　处：《Acta Geologica Sinica(English Edition)》2016年第3期838-846,共9页地质学报（英文版）

基　　金：supported by the National Basic Research Program of China (973 Program) (no.2012CB822003);the Funds of Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, CAS (No.Y421140303);Specialized Research Fund for the Doctoral Program of Higher Education (Grant 20120211110022);the Fundamental Research Funds for the Central Universities (Grant lzujbky-2015-201);the National Natural Science Foundation of China (Grants 41172022, 41272026 and 41202001)

摘　　要：A new genus and species, Rebouliothallus huolinhensis sp. nov., and two uncertain species, Ricciopsis sp. and Hepaticites sp., are described. The fossils were collected from the Lower Cretaceous Huolinhe Formation of Huolinhe Basin, northeastern China. The new genus Rebouliothallus was established in the Aytoniaceae family of Marchantiales. Rebouliothallus huolinhensis appears to be quite similar to species of the extant genus Reboulia Raddi. The species is characterized by the relatively large ventral scales. Ventral scales are large, imbricate and arranged in two rows on the ventral surface. Rhizoids are either pegged or smooth. Ricciopsis sp. is characterized by the rosette- forming thallus. Hepaticites sp. shows some similarities to liverworts. Of the forty-nine Early Cretaceous floras of China, only two floras, one from the Huolinhe basin, Inner Mongolia and the other from the Jixi Basin, Heilongjiang Province, contain fossil liverworts. The rare fossil liverwort records in the Early Cretaceous floras of China may be the result of taphonomic bias.A new genus and species, Rebouliothallus huolinhensis sp. nov., and two uncertain species, Ricciopsis sp. and Hepaticites sp., are described. The fossils were collected from the Lower Cretaceous Huolinhe Formation of Huolinhe Basin, northeastern China. The new genus Rebouliothallus was established in the Aytoniaceae family of Marchantiales. Rebouliothallus huolinhensis appears to be quite similar to species of the extant genus Reboulia Raddi. The species is characterized by the relatively large ventral scales. Ventral scales are large, imbricate and arranged in two rows on the ventral surface. Rhizoids are either pegged or smooth. Ricciopsis sp. is characterized by the rosette- forming thallus. Hepaticites sp. shows some similarities to liverworts. Of the forty-nine Early Cretaceous floras of China, only two floras, one from the Huolinhe basin, Inner Mongolia and the other from the Jixi Basin, Heilongjiang Province, contain fossil liverworts. The rare fossil liverwort records in the Early Cretaceous floras of China may be the result of taphonomic bias.

关 键 词：Rebouliothallus Ricciopsis Hepaticites Early Cretaceous Huolinhe Formation 

分 类 号：Q914.2[天文地球—古生物学与地层学] Q914.87[生物学—古生物学]