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- W2355320495 abstract "Based on new material collected from the Upper Devonian Huangjiadeng Formation (Frasnian) of Changyang,Hubei,China,morphological features of the seed-like structure Sphinxiocarpon wuhanium (Li,Hilton and Hemsley) Wang,Xue and Prestianni are reinvestigated. Compared to the specimens from the type locality (Luojia Group of Miliangshan,Wuhan),the specimens from the Changyang locality,preserved as isolated seed-like structures,are larger in size. The whole seed-like structure is stalked,and the enclosing sterile envelop,with a tapering distal end,has longitudinal striations extending from the stalk to the distal end. Smaller seed-like structures are aggregated to form a strobilus-like organ. Thus,when in early phase of development (immature),Sphinxiocarpon exhibits a strobilus-like fertile organ,while when in later phase (mature),seed-like structures are always shed from the parent plants and then isolatedly preserved in the deposits. Sphinxiocarpon probably have a lycopsid affinity; however,it may represent a unique clade in light of the large discrepancies compared with the known heterosporous lycopsids. Besides the progymnosperm-gymnosperm lineages,fertile organs with one single functional megaspore and a sterile enclosing structure,comparable to ovules or seeds to some extent,have evolved in other groups by the Late Devonian. This is a typical phenomenon of convergent evolution,that is,plants from different lineages might have chosen a similar way,e.g.,in reduction of megaspore numbers and refinement of the enclosing structures of the sporangia in this case,to adapt to their local environments." @default.
- W2355320495 created "2016-06-24" @default.
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- W2355320495 date "2010-01-01" @default.
- W2355320495 modified "2023-09-26" @default.
- W2355320495 title "MORPHOLOGICAL OBSERVATIONS OF THE SEED-LIKE STRUCTURE SPHINXIOCARPON WUHANIUM FROM THE UPPER DEVONIAN OF HUBEI,CHINA" @default.
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