| 词条 | Psilophytites |
| 释义 |
| name = Psilophytites | fossil_range = {{Geological range/linked|Late Silurian|Pragian}} | image = | image_caption = | regnum = Plantae | subregnum = Embryophyta | unranked_superdivisio = Polysporangiophyta | divisio = incertae sedis | genus = †Psilophytites | genus_authority = Høeg (1952)[1] | subdivision_ranks = Species | subdivision ={{Species list |P. gileppensis|Gerrienne (1992)[2] }} Psilophytites is a form genus of extinct plants; it was created by Høeg for spiny stems (axes) which cannot be assigned to a more precise genus or species, usually because spore-forming organs or sporangia are not present. Fossils which have been placed in this genus have been found, among other locations, in Wales in formations of Early Silurian age ({{Pridoli}}, around {{Period span/brief|Late Silurian}});[4] in the Wutubulake Formation in Xinjiang, China, of the same age;[5] in the Paraná basin, Brazil, from the Early Devonian (Lochkovian, around {{Period span/brief|Lochkovian}});[6] and in Belgium from an outcrop of Early Devonian age (Lochkovian–Pragian, around {{Period span/brief|Lochkovian|Pragian}}).[2] Gerrienne named a new species, P. gileppensis, on the basis of the Belgian fossils, which were the oldest spiny plants found in that country. Their stems were equally or unequally dichotomously branched, bearing spreading spines which were long, narrow and undivided. A very spiny stem was sometimes found at the point of division of two other stems. As no sporangia were found and the internal structure of the stems is unknown, they were placed in Psilophytites.[2] Banks considered that specimens assigned to Psilophytites could be a mixture of zosterophylls and trimerophytes. References1. ^1 {{Citation |last=Cai |first=C.-Y. |last2=Dou |first2=Y.-W. |last3=Edwards |first3=D. |year=1993 |title=New Observations on a Pridoli Plant Assemblage from North Xinjiang, Northwest China, with Comments on Its Evolutionary and Palaeogeographical Significance |journal=Geological Magazine |volume=130 |issue=2 |pages=155–170 |doi=10.1017/S0016756800009821 |lastauthoramp=yes }} [1][2][3][4][5]2. ^1 {{Citation |last=Høeg |first=O.A. |year=1952 |title=Psilophytites, a new form genus of Devonian plants |journal=Palaeobotanist |volume=1 |pages=212–214 }}, cited in {{Harvnb|Banks|1975}} 3. ^1 {{Citation |last=Edwards |first=D. |last2=Morel |first2=E.M. |last3=Paredes |first3=F. |last4=Ganuza |first4=D.G. |year=2001 |title=Plant assemblages from the Silurian of southern Bolivia and their palaeogeographic significance |journal=Botanical Journal of the Linnean Society |volume=135 |issue=3 |pages=229–250 |doi=10.1111/j.1095-8339.2001.tb01093.x |last5=Zúñiga |first5=A. |lastauthoramp=yes }}, p. 246 4. ^1 2 3 {{Citation |last=Gerrienne |first=P. |year=1992 |title=Psilophytites gileppensis nov. sp., une plante épineuse du Dévonien inférieur du bord sud du synclinorium de Verviers (Belgique) |journal=Geobios |volume=25 |issue=4 |pages=439–447 |doi=10.1016/S0016-6995(92)80068-O |language=French, English }} 5. ^1 {{Citation |last=Gerrienne |first=Philippe |last2=Bergamaschi |first2=S. |last3=Pereira |first3=E. |last4=Rodrigues |first4=M.-A. C. |last5=Steemans |first5=P. |year=2001 |title=An Early Devonian flora, including Cooksonia, from the Paraná Basin (Brazil) |journal=Review of Palaeobotany and Palynology |volume=116 |issue=1–2 |pages=19–38 |doi=10.1016/S0034-6667(01)00060-4 |lastauthoramp=yes }} }}{{Taxonbar|from=Q7256041}} 4 : Silurian plants|Early Devonian plants|Pragian life|Paleozoic life of Nunavut |
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