Gosavisiphon gen. nov. based on Halimeda paucimedullaris SCHLAGINTWEIT & EBLI, 1998: a remarkable macroalga (Udoteaceae?) from the Late Cretaceous of the Northern Calcareous Alps, (Austria and Germany), with affi nites to Late Palaeozoic and Late Triassic phylloids
Gosavisiphon gen. nov. based on Halimeda paucimedullaris SCHLAGINTWEIT & EBLI, 1998: a remarkable macroalga (Udoteaceae?) from the Late Cretaceous of the Northern Calcareous Alps, (Austria and Germany), with affi nites to Late Palaeozoic and Late Triassic phylloids
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戈萨维西丰一代
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发表时间：
2010
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通讯作者：
Geologia Croatica
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作者：
Geologia Croatica
新属Gosavisiphon与模式种haalimeda paucimedullaris SCHLAGINTWEIT & EBLI， 1998，暂称Udoteaceae，描述于北阿尔卑斯钙质山脉（奥地利，德国）Branderfl eck组晚白垩世（中/晚cenomian - santonian）和下Gosau亚群。它是一种多毫米至多毫米的海洋，硬基质栖息的大型藻类，具有膜质和部分融合的板和内部管状结构，但缺乏真正的髓质区。虽然一些菌体的细节还不清楚，但从严格的形态学角度来看，Gosavisiphon gen. nov.可以直接与晚古生代和上三叠世的叶状藻类进行比较。Gosavisiphon gen. 11 .是自晚三叠世Ivanovia triassica REID以来，白垩纪的第一个板状虹吸藻化石记录。单型分类群很可能是北部钙质阿尔卑斯特有的，在那里它生活在受保护的、受陆地影响的泻湖环境中，附着在坚硬的基质上（后生动物的骨骼，原始的贝壳）。根据圆柱形哈利梅达的发现？本文对haalimeda . LAMOUROUX的节段形态系统发育进化进行了研究，并对haalimeda . LAMOUROUX的节段形态系统发育进化进行了探讨。在Turonian之前，不知道具有盘状鳞片的haalimeda物种，可以与现存物种进行形态学比较。具有圆柱形节段的形式可以追溯到更早的时候，但不能直接与现代对应的形态进行比较，因此，植物学家和古生物学家最近都提出，将现存物种和化石物种结合起来，对长期存在的methusalemi物种的存在产生了怀疑。
The new genus Gosavisiphon with the type-species Halimeda paucimedullaris SCHLAGINTWEIT & EBLI, 1998, tentatively referred to the Udoteaceae, is described from the Late Cretaceous (Middle/Late Cenomanian-Santonian) of the Branderfl eck Formation and the Lower Gosau Subgroup of the Northern Calcareous Alps (Austria, Germany). It is a plurimillimetric to pluricentimetric marine, hard-substrate dwelling macroalga, with membraneous and partly fused plates and an internal siphonaceous construction but lacking a real medullary zone. Although some thallus details are still unknown, Gosavisiphon gen. nov. can, from a strictly morphological point of view, directly be compared with the Late Palaeozoic and Upper Triassic phylloid algae. Gosavisiphon gen. nov. is the fi rst fossil record of a platy siphonal alga in the Cretaceous, since the Late Triassic Ivanovia triassica REID. The monotypic taxon is most probably endemic to the Northern Calcareous Alps where it dwelled in protected, terrestrially infl uenced lagoonal environments attaching to hard substrates, (metazoan skeletons, rudistid shells). Based on fi ndings of the cylindrical Halimeda? aff. johnsoni PAL and another taxon described as Halimeda sp. with typically fl attened ovate segments, some considerations on the segment-morphological phylogenetic evolution of Halimeda LAMOUROUX are provided. Halimeda species with discoidal-fl attened segments, that can morphologically be compared with extant species, are not known prior to the Turonian. Forms possessing cylindrical segments date further back, but can not directly be compared morphologically with modern counterparts, thus placing doubts on the existence of long-lasting methusalemi species by uniting extant and fossil species, as proposed by both botanists and palaeontologists in recent times.