Archaeopteris halliana from the Late Devonian(Famennian)of Anhui Province,China  

作　　者：GUO Yun WANG Deming 

机构地区：[1]Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Department of Geology, Peking University, Beijing 100871, China

出　　处：《Acta Geologica Sinica(English Edition)》2009年第3期479-491,共13页地质学报（英文版）

基　　金：supported by the National Natural ScienceFoundation of China(Nos.40772010,40830211);the Foundation for the Author of National Excellent Doctoral Dissertation of China(200429)

摘　　要：New materials from the Upper Devonian （Famennian） Wutong Formation of Chizhou District, Anhui Province, South China, allow description of fertile and sterile characters of Archaeopteris halliana. This plant has penultimate axes attached by sterile leaves and paired ultimate branches in the same ontogenetic spiral. Sterile leaves are narrowly cuneate in shape and bear distal margins dissected deeply. These leaves are spirally arranged on sterile ultimate axes. Non-laminated sporophylls occur spirally on the ultimate axes and bifurcate once or twice. Elongate sporangia with longitudinal dehiscence are borne adaxially below or above the dividing points of the sporophylls. Despite the leaf shape resembling that of Archaeopteris macilenta, our plant is assigned to A. halliana because of its non-laminated sporophylls. Fertile characters should be given priority or enough consideration in identifying species of Archaeopteris.New materials from the Upper Devonian （Famennian） Wutong Formation of Chizhou District, Anhui Province, South China, allow description of fertile and sterile characters of Archaeopteris halliana. This plant has penultimate axes attached by sterile leaves and paired ultimate branches in the same ontogenetic spiral. Sterile leaves are narrowly cuneate in shape and bear distal margins dissected deeply. These leaves are spirally arranged on sterile ultimate axes. Non-laminated sporophylls occur spirally on the ultimate axes and bifurcate once or twice. Elongate sporangia with longitudinal dehiscence are borne adaxially below or above the dividing points of the sporophylls. Despite the leaf shape resembling that of Archaeopteris macilenta, our plant is assigned to A. halliana because of its non-laminated sporophylls. Fertile characters should be given priority or enough consideration in identifying species of Archaeopteris.

关 键 词：progymnosperms Archaeopteris SPOROPHYLL Late Devonian Wutong Formation AnhuiProvince South China 

分 类 号：P534.44[天文地球—古生物学与地层学] S858.26[天文地球—地质学]