Late Jurassic fishes from Longing Gap, Antarctic Peninsula
Late Jurassic fishes from Longing Gap, Antarctic Peninsula
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DOI：
10.1671/1952-4
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发表时间：
2004-03-01
影响因子：
1.4
通讯作者：
Kiessling, W
中科院分区：
文献类型：
--
作者：
Arratia, G;Scasso, RA;Kiessling, W
南极晚侏罗世鱼类的记录很少。它们包括一个不确定的硬骨鱼前锋Ameghino（Nordenskjold）组在Longing Gap和两个不完整的aspidorhyn-chiforms从詹姆斯罗斯岛，所有推定的晚侏罗纪时代。本文介绍了在隆宁坳陷上侏罗统新近发现的鱼类新材料。新材料由一片体鳞组成，根据鳞片的结构，它对应于一个新的属和种（Ameghinichthys anarcticus gen. et sp. nov.）属于一个不确定的辐鳍科;一种蜘蛛喙形的根据鳞片的结构和分布确定为棘鳍鱼;以及一新的鱼形目标本，即舌tithrissopsseymouri gen. etsp. nov.。该新属与欧洲鱼形目的区别在于前鳃盖的形状，存在长的感觉前鳃盖支几乎到达骨的后缘，以及鳞片的不寻常结构，细骨层掩盖了环。南极洲的棘鳍龙的存在与冈瓦纳纪的其他记录一致。鱼形目（英语：Ichthyodectiformes），先前已知有四个欧洲属，在晚侏罗世期间将该群的分布延伸到南半球的最南端。与大多数非硬骨鱼相反，已知的晚侏罗世硬骨鱼显然是南半球限制区域的特有种。
Few records of Late Jurassic fishes have been reported previously from Antarctica. They include an indeterminate teleost front the Ameghino (Nordenskjold) Formation at Longing Gap and two incomplete aspidorhyn-chiforms from James Ross Island, all of presumed Late Jurassic age. New fish material recently recovered in the Upper Jurassic of Longing Gap is described. The new material consists of one piece of body squamation, which, based on the structure of the scales, corresponds to a new genus and species (Ameghinichthys antarcticus gen. et sp. nov.) of an indeterminate actinopterygian family; one aspidorhynchiform identified as Vinctifer sp. due to the structure and distribution of the scales; and numerous specimens of a new ichthyodectiform, Antarctithrissops seymouri gen. et sp. nov. This new genus differs from European ichthyodectiforms in the shape of the preopercle, the presence of long sensory preopercular branches almost reaching the posterior margin of the bone, and the uncommon structure of the scales, with a fine layer of bone obscuring the circuli.The presence of Vinctifer in the Antarctic is consistent with its other Gondwanan records. The Ichthyodectiformes, previously known from four European genera, extends the distribution of the group to the southernmost part of the Southern Hemisphere during the Late Jurassic. In contrast to most non-teleostean fishes, the known Late Jurassic teleosts apparently are species endemic to restricted areas in the Southern Hemisphere.