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首页> 外文期刊>Journal of Asian earth sciences >Hooked: Habits of the Chinese Permian gigantopterid Gigantonoclea
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Hooked: Habits of the Chinese Permian gigantopterid Gigantonoclea

机译：迷上了：中国二叠纪巨翅类巨蜥的习性

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摘要

Based upon anatomical evidence, Permian aged gigantopterid fossils are in general reconstructed as climbing or scrambling plants. Gigantonoclea, a genus of adpressed gigantopterid foliage from the Permian of northern China, has been reported to co-occur with hook-like organs that were interpreted as indicating a scrambling/climbing habit. We reinvestigated these hook-like structures and re-evaluated the nature of the co-occurrences in context with the flora preserved in each plant-bearing fossil 'bed' in the North China sedimentary succession. New findings show that the species Gigantonoclea hallei probably climbed using specially adapted clusters of compound grappling hook-like shoots borne on the stems. This structural arrangement comprising shoots of hooks is new to the scrambling/climbing concept in gigantopterids. However, a key figured specimen previously reported as showing intermediate hook-tipped leaf morphology on a sole pinnule tip is discounted as such and is reinterpreted as a 'normal' pinnule partially hidden under sediment that results in an unusual appearance to this pinnule tip. Adaptations for climbing or scrambling based upon 'hooked leaves' observed in Gigantonoclea lagrelii are no longer supported and are reinterpreted as incompletely expanded leaves where the vernation process was interrupted. These data weaken prior interpretations of G. lagrelii as a climber/scrambler and raise doubts about the ubiquity of hooks amongst the gigantopterids as structures enabling them to climb or scramble their way through the Permian world.
机译：根据解剖学证据，通常将二叠纪的老年翅足类化石重建为攀缘植物或爬行植物。 Gigantonoclea是中国北方二叠纪的一种加倍体大型鳞翅目叶子的属，据报道与钩状器官同时出现，这些器官被解释为具有爬虫/爬虫习性。我们对这些钩状结构进行了重新研究，并根据华北沉积演替过程中每个含植物化石“床”中保存的菌群重新评估了共生的性质。新发现表明，Gigantonoclea hallei物种可能是通过茎上带有特殊抓钩的复合钩状枝条簇而爬上的。这种包含钩子芽的结构布置对于巨翅目的扰动/爬升概念是新的。但是，先前报道的在关键的标本标本上显示出在单个小穗尖上的中间钩状叶片形态被打折了，因此被重新解释为部分隐藏在沉积物中的“正常”小穗，导致该小穗尖的外观异常。不再支持基于在Gigantonoclea lagrelii中观察到的“钩叶”而适应攀爬或爬升的适应，并且被重新解释为未完全扩展的叶，从而中断了花nation过程。这些数据削弱了先前对拉格里尔氏菌作为攀爬者/争夺者的解释，并引起了对巨大翼龙作为其能够爬升或爬过二叠纪世界的结构中钩子普遍存在的怀疑。

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