期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 277, 期 1679, 页码 301-309出版社
ROYAL SOC
DOI: 10.1098/rspb.2009.0913
关键词
Nystroemia reniformis (Kawasaki) Wang; Pfefferkorn; Sun and Liu; Chiropteris Kurr; Permian; China
资金
- Chinese Academy of Sciences [KZCX2-YW-105]
- Chinese Natural Science Foundation [40572008, 40621062]
- Ministry of Science and Technology of China [2006CB806400]
Nystroemiaceae is proposed as a new family of gymnosperms from the Permian of Cathaysia that adds to the diversity of gymnosperms known from this critical time in seed plant evolution. This family is characterized by bifurcating and highly branched pinnate ovuliferous organs bearing bicornute ovules (seeds) and entire leaves with anastomozing veins that are born on complex and modern-looking branching systems with clear axillary branching. The reconstruction is based on numerous large specimens from two localities in North China, in which the different plant parts are attached to each other. The ovulate structures show some apparently plesiomorphic (primitive) character states more typical of early seed plants, whereas the leaves and branches show the clearly apomorphic (derived) character states of broad-leaved gymnosperms.
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