Earliest North American articulated freshwater acanthomorph fish (Teleostei: Percopsiformes) from Upper Cretaceous deposits of Alberta, Canada
Earliest North American articulated freshwater acanthomorph fish (Teleostei: Percopsiformes) from Upper Cretaceous deposits of Alberta, Canada
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最早的北美铰接淡水棘鱼（Teleostei：Percopsiformes）来自加拿大艾伯塔省上白垩纪沉积物
DOI：
10.1017/s0016756819001328
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发表时间：
2019
影响因子：
2.3
通讯作者：
A. Neuman
中科院分区：
文献类型：
--
作者：
A. Murray;D. Brinkman;M. G. Newbrey;A. Neuman
摘要来自斯科拉德组马斯特里赫特部分的化石被鉴定为棘形鱼类。一具节状标本，部分和对应保存完好，是孔雀目的一员，其基础是在第二前脊椎骨上有一个完整的神经棘，在尾部骨架上有两个神经棘(均为副翼状特征)，以及六条鳃骨线和在龟盖上的一条前背侧开挖的边缘(孔状特征)。我们将其命名为一个新的属和种，Lindoeichthys albertensis。没有先验限制的系统发育分析恢复了一棵最节俭的树，新的分类单元被置于一个包含古新世蒙大拿属Mcconichthys+Percopsidae的支系的姊妹群。然而，这一分析并不能恢复传统的隐翅目(包括隐翅虫科和隐翅虫科)的单系学地位。在第二次分析中，我们限制了扇形目的传统成员为单系，导致新种被归类为PerCopsis的姐妹群。来自双鱼角地区的铰接式盆状标本允许从脊椎动物微化石地点分离出的牙齿被鉴定为来自该组的成员。这些孤立的元素首先出现在阿尔伯塔省坎帕尼亚晚期的朱迪斯河群和犹他州的凯帕罗维斯组中，证明至少在75 Ma前北美西部内陆就存在有机质鱼类。
Abstract Fossil material from the Maastrichtian part of the Scollard Formation is identified as belonging to an acanthomorph fish. An articulated specimen, preserved in part and counterpart, is a member of the paracanthopterygian order Percopsiformes, based on it having a full neural spine on the second preural centrum and two epurals in the caudal skeleton (both paracanthopterygian characters), as well as six branchiostegal rays and an anterodorsal excavated margin on the opercle (percopsiform characters). We name this as a new genus and species, Lindoeichthys albertensis. A phylogenetic analysis with no prior constraints recovered a single most-parsimonious tree with the new taxon placed as the sister group to a clade containing the Palaeocene Montana genus Mcconichthys + Percopsidae. However, this analysis did not recover the traditional percopsiforms (including Aphredoderidae and Amblyopsidae) as monophyletic. A second analysis, in which we constrained the traditional members of the Percopsiformes to be monophyletic, resulted in the new species being placed as the sister group to Percopsis. The articulated percopsiform specimen from the Pisces Point locality allows isolated dentaries from vertebrate microfossil localities to be identified as being from a member of that group. These isolated elements first appear in the late Campanian Judith River Group of Alberta and the Kaiparowits Formation of Utah, documenting that percopsiform fishes were present in the Western Interior of North America at least 75 Ma ago.