AN INSIGHT INTO THE SYSTEMATICS OF PLICATOSTYLIDAE (BIVALVIA), WITH A DESCRIPTION OF <em>PACHYGERVILLIA ANGUILLAENSIS</em> N. GEN. N. SP. FROM THE <em>LITHIOTIS</em> FACIES (LOWER JURASSIC) OF ITALY

IF 1.6 3区 地球科学 Q2 GEOLOGY
RENATO POSENATO, GAIA CRIPPA
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引用次数: 0

Abstract

The Lithiotis facies represents an Early Jurassic global bioevent characterized by a remarkable spread of gregarious bivalves, which produced large sedimentary bodies in tropical shallow-water marine environments. The most peculiar and common genera Lithiotis, Cochlearites and Lithioperna, with aberrant and extremely elongated or strongly flattened shells, have been studied since the second half of the nineteenth century. Despite numerous systematic studies, their phylogenetic relationship with the other bivalve families is still uncertain. The Lithiotis facies yields other bivalve genera, among which a large multivincular mytiloid, provisionally determined as Isognomon (Mytiloperna) sp. ind. or Mytiloperna sp., is recorded in the literature. This taxon is here studied from a systematic point of view to clarify its taxonomic position and solve the open nomenclature adopted in the past. Here, we propose a new genus Pachygervillia and a new species Pachygervillia anguillaensis. The stratotype is located in the lower part of the Rotzo Formation (Calcari Grigi Group, Lower Jurassic), while the type locality is in the Lessini Mountains (Verona Province, Trento Platform, Southern Alps). This new species is characterized by a thick aragonitic inner shell layer with a fibrous, irregular, spherulitic, prismatic microstructure combined with a nacreous middle layer, both also occurring in species of the genera Lithiotis and Cochlearites of the family Plicatostylidae. This microstructural layering is here proposed as the main taxonomic character of the family, which is here emended and divided into the following two subfamilies: Plicatostylinae, yielding Lithiotis and Cochlearites with stick-like shells, and Pachygervilliinae nov. subfam., yielding Gervilleioperna, Lithioperna, Pachygervillia n. gen., and Pachyperna, previously placed within the subfamily Isognomoninae.
双壳科(PLICATOSTYLIDAE, bivalia)的系统学研究——兼论pachygervilla ANGUILLAENSIS</em>N. GEN. N. SP. FROM THE < emgt;LITHIOTIS<意大利相(下侏罗纪)
岩屑岩相代表了早侏罗世全球生物事件,其特征是群居双壳类在热带浅水海洋环境中形成了大型沉积体。自19世纪下半叶以来,人们一直在研究最奇特和最常见的Lithiotis属、cochleites属和Lithioperna属,它们的壳异常细长或非常扁平。尽管有许多系统的研究,它们与其他双壳类科的系统发育关系仍然不确定。Lithiotis相还产有其他双壳类属,其中有一种大的多脉Mytiloperna,暂定名为Isognomon (Mytiloperna) sp. d.或Mytiloperna sp.。本文从系统的角度对该分类单元进行研究,以明确其分类地位,解决以往采用开放式命名法的问题。本文提出了Pachygervillia新属和Pachygervillia anguillaensis新种。层型位于下侏罗统Rotzo组下部(Calcari Grigi Group,下侏罗统),而类型位置位于Lessini Mountains (Verona Province, Trento Platform, Southern Alps)。该新种具有较厚的文石质内壳层,纤维状、不规则、球晶状、棱柱状微观结构与珍珠状中间层相结合,这两种现象也出现在卷叶藻科的石属和耳蜗属物种中。本文提出这种微观结构分层是该科的主要分类特征,并对其进行了修正,将其分为以下两个亚科:Plicatostylinae,产棒状壳的Lithiotis和Cochlearites,以及Pachygervilliinae 11 . subfam。,产Gervilleioperna, Lithioperna, Pachygervillia n. gen,和Pachyperna,以前被归入同花草亚科。
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来源期刊
CiteScore
3.60
自引率
4.30%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Rivista Italiana di Paleontologia e Stratigrafia was founded in 1895. It publishes original papers dealing with all fields of paleontology and of stratigraphy, from Italy and the Mediterranean to the Tethys, as well across the globe from China to North America.
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