Silurian and Devonian Modiomorphidae Bivalves from Bolivia

IF 1.2 4区地球科学 Q3 PALEONTOLOGY

Ameghiniana Pub Date : 2021-06-30 DOI:10.5710/AMGH.07.01.2021.3400

A. D. Farjat

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引用次数: 3

Abstract

Abstract. Modiomorphid bivalves from the Silurian and Devonian beds of the Central Andean Basin of Western Gondwana are herein presented. This paper is not only a systematic updated revision of certain species of modiomorphids but also includes the description of newly found ones in Bolivia. They were collected from 17 scattered outcrops along Eastern Cordillera, Eastern Altiplano, Interandean, and Subandean regions of Bolivia. A total of 55 specimens, well- to regularly-preserved, were studied. The Sphenotomorpha orientalis new species from the Interandean of Mataral is described. The genus Sphenotomorpha is reported for the first time from Ludlowian layers of the Central Andean Basin with Sphenotomorpha sp. A. Other species described and systematically discussed are Modiomorpha concentrica, Modiomorpha cf. pimentana, Sphenotomorpha ulrichi and Sphenotomorpha cf. bodenbenderi? Forms classified as Modiomorphidae indet. A, B, and C are studied and some discussions about their previous and current taxonomic designations are herein presented. The biostratigraphic distribution of the two cosmopolitan genera, Sphenotomorpha, 1916, and Modiomorpha, 1869, is proposed. From the Eifelian to the Frasnian, endobyssal forms, such as Modiomorpha concentrica, coexisted with foot forms like Modiomorphidae indet. C and Sphenotomorpha sp. B, which would have developed a discreet byssus. This research contributes to the still inaccurately known Silurian and Devonian palaeogeography of the Central Andean Basin.

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玻利维亚志留纪和泥盆纪双足目

摘要本文介绍了冈瓦纳大陆西部安第斯盆地中部志留纪和泥盆纪地层的变形双壳类。这篇论文不仅是对某些变形亚目物种的系统更新修订，还包括对玻利维亚新发现的变形亚目的描述。它们是从玻利维亚科迪勒拉东部、Altiplano东部、Interandean和Subandean地区的17个零散露头中采集的。总共研究了55个保存完好到有规律的标本。本文报道了马塔拉尔岛Interandean的东方鞘翅目新种。Sphenotomorpha属首次在安第斯盆地中部的Ludlowian层与Sphenotomorpha sp.A一起被报道。所描述和系统讨论的其他物种有Modiomomorpha concentra、Modiomomorha cf.pimentana、Sphenotoorpha ulrichi和Sphenotorpha cf.bodenbenderi？形态分类为无翅目。A、对A、B和C进行了研究，并对它们以前和现在的分类名称进行了一些讨论。提出了两个世界性属Sphenotorpha（1916）和Modiomorpha（1869）的生物地层学分布。从艾菲尔阶到弗雷斯阶，内byssal形态，如同心莫迪莫形目，与足形目，如独立莫迪莫型目共存。C和Sphenotomorpha sp.B，它们本可以发育出一个谨慎的byssus。这项研究有助于了解安第斯盆地中部志留纪和泥盆纪的古地理。

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来源期刊

Ameghiniana 地学-古生物学

CiteScore

2.50

自引率

10.00%

发文量

期刊介绍： Ameghiniana is a bimonthly journal that publishes original contributions on all disciplines related to paleontology, with a special focus on the paleontology of Gondwana and the biotic history of the southern hemisphere. Published yearly since 1957, it has undoubtedly become the main palaeontological publication from Latin America. Ameghiniana has recently broadened its editorial board, reorganized its production process, and increased to a bimonthly frequency, which resulted in a significant decrease in the turn around time.