Frenelopsis pombetsuensis: a new cheirolepidiaceous conifer from the Lower Cretaceous (Albian) of Hokkaido, Japan.
Frenelopsis pombetsuensis: a new cheirolepidiaceous conifer from the Lower Cretaceous (Albian) of Hokkaido, Japan.
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DOI：
10.2517/prpsj.1.126
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发表时间：
1997-06
影响因子：
0.9
通讯作者：
K. Saiki
中科院分区：
文献类型：
--
作者：
K. Saiki
一种新的针叶树化石，根据日本北海道下白垩统（Albian）的一个单一标本进行描述。Froneiopsis pombetsuensis与F.产于君滨县铫子早白垩世的秋子，每个节上有两片叶子。然而，Freneiopsis pombetsuensis的表皮特征与F. hoheneggeri的化石来源于波兰早白垩世，而F.长志。日本晚侏罗世-早白垩世古植物群可分为两个不同的类型：良关和Tetori。然而，迄今为止，由于对北海道早白垩世植物群的化石记录知之甚少，对其归属尚未确定。Freneiopsis属是Ryosekitype植物区系的重要成员之一，在Tetori植物区系中从未发现过。该化石是北海道早白垩世良石型植物群特征分类单元的首次记录。
A new fossil conifer, Freneiopsis pombetsuensis sp. nov., is described on the basis of a single specimen obtained from the Lower Cretaceous (Albian) of Hokkaido, Japan. Freneiopsis pombetsuensis is similar to F. choshiensis from the Lower Cretaceous of Choshi, Kimigahama, in having two leaves at each node. The cuticular feature of Freneiopsis pombetsuensis is, however, rather more similar to that of F. hoheneggeri from the Lower Cretaceous of Poland than to F. choshiensis. The Late Jurassic to Early Cretaceous paleofloras of Japan have been divided into two distinct types: the Ryoseki and Tetori. However, attributions of the Early Cretaceous flora of Hokkaido have not been made because of its hitherto poorly-known fossil record. The genus Freneiopsis is one of the most important members of the Ryosekitype floras and has never been found in the Tetori-type floras. The present fossil is the first record of characteristic taxon of the Ryoseki-type flora from the Lower Cretaceous of Hokkaido.