Carboniferous ( T ournaisian) fish assemblages from the I sle of B ute, S cotland: systematics and palaeoecology
Carboniferous ( T ournaisian) fish assemblages from the I sle of B ute, S cotland: systematics and palaeoecology
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苏格兰布特岛的石炭纪（图奈斯）鱼类组合：系统学和古生态学
DOI：
10.1111/pala.12112
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发表时间：
2014
期刊：
影响因子：
2.6
通讯作者：
Carpenter D
中科院分区：
文献类型：
--
作者：
Carpenter D
我们描述了苏格兰布特岛上两个地区石炭纪(图尔奈期中期到晚期)巴拉干组的鱼类组合，霍克尼布和磨坊洞。化石物质赋存于当地改造过的薄层白云岩石灰岩中，被解释为在季节性干燥的沿海平原上或附近发育的非常浅的湖泊或泻湖的沉积。大多数脱节的化石包括孤立的牙齿、下颌骨、鳞片、、真皮骨、鳞毛虫和脊椎骨。这些动物群包括根齿动物(参看Archichthys portlocki，参看Strepsodus soroides)、肺鱼(Sagenodussp.)、其他石龙纲动物(Megalichhyssp.)、一种鲨鱼(Ageleodus Spectinatus)、气候型棘齿动物和不确定的放线翅目动物。Mill Hole组合特别值得注意，因为它包括一些假定的幼体形式(始祖鱼和Sagenodus)。对记录在案的分类群栖息地偏好的批判性审查表明，大多数分类群要么是泛盐生的，要么就是始祖鱼，可能是咸水或淡水环境的特有物种。布特鱼床处于一个关键的进化期，在此期间，许多鱼类和其他动物群体正在被动或主动地渗透到非海洋环境中。在这一波殖民浪潮中，湖泊和泻湖可能起到了保护青少年托儿所的作用。
We describe fish assemblages from the Carboniferous (mid‐ to late Tournaisian) Ballagan Formation at two localities, Hawk's Nib and Mill Hole, on the Isle of Bute, Scotland. Fossil material occurs in thin, locally reworked dolomitic limestone beds, interpreted as the deposits of very shallow lakes or lagoons, developed on, or adjacent to, a seasonally dry coastal plain. The mostly disarticulated fossils comprise isolated teeth, mandibles, scales, tesserae, dermal bones, lepidotrichia and vertebrae. The fauna includes rhizodonts (cf.Archichthys portlocki, cf.Strepsodus sauroides), lungfish (Sagenodussp.), other sarcopterygians (Megalichthyssp.), one shark (Ageleodus pectinatus), climatiiform acanthodians and indeterminate actinopterygians. The Mill Hole assemblage is especially noteworthy because it includes some putative juvenile forms (ArchichthysandSagenodus). A critical review of the habitat preferences of the documented taxa suggests that most were either euryhaline or, in the case ofArchichthys, probably endemic to brackish or freshwater settings. The Bute fish beds fall within a crucial evolutionary period during which many fish and other animal groups were infiltrating nonmarine environments, either passively or actively. It may be that lakes and lagoons may have functioned as protected nurseries for juveniles during this wave of colonization.