Diversity and size changes in palaeonisciform fishes (Actinopterygii, Pisces) from the Pennsylvanian Mazon Creek fauna, Illinois, U.S.A.
Diversity and size changes in palaeonisciform fishes (Actinopterygii, Pisces) from the Pennsylvanian Mazon Creek fauna, Illinois, U.S.A.
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美国伊利诺伊州宾夕法尼亚州马松溪动物群的古鱼形鱼类（Actinopterygii，双鱼座）的多样性和大小变化
DOI：
10.1080/02724634.1987.10011635
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发表时间：
1987
影响因子：
1.4
通讯作者：
D. Bardack
中科院分区：
文献类型：
--
作者：
H. Schultze;D. Bardack
摘要在美国伊利诺伊州中部宾夕法尼亚Mazon Creek动物群中发现7种古贝类，其中2种为具齿鳞的新种，即E。沃尔菲，n.sp.和“E。”Remotus，n.sp；“E.”Perpennatus Eastman，1903是一种幼虫，是“E.”的同义词。Hay 1900年。两个鳞片光滑的新种被归入新属：Illiniichthys cozarti，N.G.Et sp.和螺旋藻Nozamichthys tororta N.G.ET sp.“E.”Peltigerus和“E.”到目前为止，在Mazon Creek动物群中最常见的古鱼形目动物是甲鱼，幼体发育的不同阶段都有标本出现。大多数可能是根据鳍射线计数(尾鳍除外)归入一个物种，因为这些数字不会随着“生长”而改变。鳞片首先出现在尾叶上部和/或沿侧线。头部长度和上尾叶长度(“E”除外)。在“生长”过程中，与标准体长相比，体长变短。轨道长度相对于头部长度变得更短。
ABSTRACT Seven palaeonisciform species can be recognized in the Middle Pennsylvanian Mazon Creek fauna of Illinois, U.S.A. Two of the five “Elonichthys” species with denticulated scales are new, “E.” wolffi, n.sp. and “E.” remotus, n.sp.; “E.” perpennatus Eastman, 1903, is a juvenile form and a synonym of “E.” hypsilepis Hay 1900. Two new species with smooth scales are placed in new genera: Illiniichthys cozarti, n.g. et sp., and Nozamichthys contorta n.g. et sp. “E.” peltigerus and “E.” hypsilepis are by far the most common palaeonisciforms in the Mazon Creek fauna and specimens of different stages of juvenile development occur. Most may be assigned to a species based on fin ray count (except caudal fin) because these numbers do not change with “growth.” Scales first appear on upper caudal lobe and/or along the lateral line. Head length and length of upper caudal lobe (except in “E.” hypsilepis) decrease relative to standard length during “growth.” Orbital length becomes shorter relative to head length i...