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Thrinkophyton
''Thrinkophyton'' was a genus of Early Devonian land plant with branching axes. Known fossils are of Lochkovian to Pragian age (). A cladogram published in 2004 by Crane et al. places ''Thrinkophyton'' in the core of a paraphyletic In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ... stem group of broadly defined " zosterophylls", basal to the lycopsids (living and extinct clubmosses and relatives). Hao and Xue in 2013 listed the genus as a zosterophyll. References External links Cladogramfrom Zosterophylls Prehistoric lycophyte genera Devonian plants Devonian extinctions Lochkovian Pragian life {{paleo-lycophyte-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zosterophylls
The zosterophylls are a group of extinct land plants that first appeared in the Silurian period. The taxon was first established by Banks in 1968 as the subdivision Zosterophyllophytina; they have since also been treated as the division Zosterophyllophyta or Zosterophyta and the class or plesion Zosterophyllopsida or Zosteropsida. They were among the first vascular plants in the fossil record, and had a world-wide distribution. They were probably stem-group lycophytes, forming a sister group to the ancestors of the living lycophytes. By the late Silurian (late Ludlovian, about ) a diverse assemblage of species existed, examples of which have been found fossilised in what is now Bathurst Island in Arctic Canada. Morphology The stems of zosterophylls were either smooth or covered with small spines known as enations, branched dichotomously, and grew at the ends by unrolling, a process known as circinate vernation. The stems had a central vascular column in which the protoxylem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
