| 词条 | Uskiella |
| 释义 |
|fossil_range = {{Geological range/linked|Early Devonian}} |taxon=Uskiella |authority = Shute & D.Edwards 1989[1] |subdivision_ranks = Species |subdivision = †U. spargens Shute & D.Edwards 1989 †U. reticulata Fanning et al. 1992 }}Uskiella is a genus of small fossil plants of Early Devonian age (around {{Period span/brief|Early Devonian|-1}}). The diagnostic characters are naked axes branching isotomously, terminating in ellipsoidal, vertically elongate flat sporangia which split longitudinally into two valves.[1] Spores of U. reticulata have a reticulate appearance.[2] Coalified specimens have been reported from Wales,[2] with a possible occurrence in Australia.[1] The relationships of the genus are not clear because many anatomical details remain unknown. In 2004, Crane et al. published a cladogram for the polysporangiophytes in which Uskiella is basal to the lycophytes (clubmosses and relatives).[3] {{clade| label1=tracheophytes | 1={{Clade tracheophyte|lycophytes=collapsed|euphyllophytes=collapsed}} }} References1. ^1 2 {{Citation |last=Shute |first=C.H. |last2=Edwards |first2=D. |year=1989 |title=A new rhyniopsid with novel sporangium organization from the Lower Devonian of Wales |journal=Botanical Journal of the Linnean Society |volume=100 |pages=111–137 |doi=10.1111/j.1095-8339.1989.tb01713.x |lastauthoramp=yes |issue=2 }} {{Taxonbar|from=Q7902022}}2. ^1 {{Citation |last=Fanning |first=U. |last2=Edwards |first2=D. |last3=Richardson |first3=J.B. |year=1992 |title=A diverse assemblage of early land plants from the Lower Devonian of the Welsh Borderland |journal=Botanical Journal of the Linnean Society |volume=109 |pages=161–188 |lastauthoramp=yes | doi = 10.1111/j.1095-8339.1992.tb00264.x |issue=2}} 3. ^{{Citation |last=Crane |first=P.R. |last2=Herendeen |first2=P. |last3=Friis |first3=E.M. |year=2004 |title=Fossils and plant phylogeny |journal=American Journal of Botany |volume=91 |pages=1683–99 |url=http://www.amjbot.org/cgi/content/full/91/10/1683 |accessdate=2011-01-27 |doi=10.3732/ajb.91.10.1683 |lastauthoramp=yes |issue=10 |pmid=21652317}} 1 : Early Devonian plants |
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