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Ornatifilum
''Ornatifilum'' (Latin ''ornatus'' + ''filum'', Ornamented filament) is an artificial form genus, which is used to categorise any small, branched filaments with external ornamentation. It has been applied to microfossils of Devonian age with possible fungal affinities; two "species" have been described, and further Silurian fossils closely resemble it. These Silurian specimens hint that the organisms may have been fungal, placing them among the oldest representatives of this kingdom.
==Background==
The form genus ''Ornatifilum'' was erected by Burgess and Edwards in 1991 to describe tubular fossils retrieved by acid maceration from the late Silurian. It was originally intended as a form genus, to facilitate stratigraphy and environmental reconstruction; the fossils do not display enough features to classify them confidently, even at a kingdom level.〔
The organisms comprise tubes of around 10 μm diameter, with an ornamented, granular surface texture. These fossils were compared to late Silurian (Ludlow epoch) fossils retrieved from the Burgsvik beds by Sherwood-Pike and Gray, and the genus was used when similar fossils were recovered from the Scottish island of Kerrera by Charles Wellman ten years later.
Similar, unornamented filaments are known from the USA.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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