Liostrea roemeri (Ostreida, Bivalvia) attached to Upper Jurassic ammonites of northeastern Mexico

Liostrea roemeri (Ostreida, Bivalvia) attached to Upper Jurassic ammonites of northeastern Mexico
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Liostrea roemeri(Ostreida、Bivalvia)附着于墨西哥东北部上侏罗统菊石上

DOI:
10.1007/s12549-014-0154-z
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发表时间:
2014
影响因子:
1.4
通讯作者:
Zell
 P.
 Beckmann
 S.
 Stinnesbeck
Zell
 P.
 Beckmann
 S.
 Stinnesbeck
中科院分区:
地球科学3区
文献类型:
--
作者:
Zell
 P.
 Beckmann
 S.
 Stinnesbeck

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在墨西哥东北部,上侏罗纪至下白垩纪(Kimmeridgian-Berriasian)的半远洋La Casita组以其保存完好的菊石多样性和丰富的组合而闻名。在这里,我们提出的标本KimmeridgianIdocerassp。和Tithonian“Aparatosneptes”aff.communisSpath覆盖的epizoicoysterLiostrearoemeri(昆斯特,1843)。附着在菊石壳的两侧,埋藏和epizoan-ammonite方位分析和壳大小的测量表明,牡蛎附着在生活主机。我们解释存在不同的双壳类生长队列在这个位置,以反映两代的epizoan解决:最初的一个队列的牡蛎定居在菊石的少年轮,其次是第二组相当小的个人的外轮。Liostrea roemeri附着在菊石上的一种假浮游生活方式可能反映了对上侏罗纪La Casita海海底附近缺氧条件的战略反应。roemeri以前在欧洲被描述过,也附着在菊石上。
In northeastern Mexico, the Upper Jurassic to lowermost Cretaceous (Kimmeridgian–Berriasian) hemipelagic La Casita Formation is widely known for its diverse and abundant assemblage of well-preserved ammonites. Here we present specimens of KimmeridgianIdocerassp. and Tithonian “Virgatosphinctes” aff.communisSpath covered by the epizoic oysterLiostrearoemeri(Quenstedt, 1843). Attachment to both sides of the ammonite shells, taphonomic and epizoan-to-ammonite orientation analyses and shell-size measurements indicate that the oysters attached to living hosts. We interpret the presence of distinct bivalve growth cohorts at this location to reflect two generations of epizoan settlement: an initial cohort of oysters settled on the juvenile whorls of ammonites and were followed by a second set of considerably smaller individuals on the outer whorls. A pseudoplanktonic mode of life ofLiostrea roemeriattached to ammonites may reflect a strategic response to oxygen-depleted conditions near the seafloor of the Upper Jurassic La Casita Sea.L. roemeriwas previously described from Europe, also attached to ammonites.
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