New encrusting tentaculitoids from the Silurian of Estonia and taxonomic status of Anticalyptraea Quenstedt, 1867

IF 1.2 4区地球科学 Q2 GEOLOGY

Gff Pub Date : 2022-04-03 DOI:10.1080/11035897.2022.2042378

M. Zatoń, O. Vinn, U. Toom, J. Słowiński

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引用次数: 2

Abstract

ABSTRACT A new genus and species of encrusting tentaculitoid, Lindstroemiella eichwaldi, from the Silurian (Ludfordian Stage, Ludlow) of Saaremaa Island in Estonia, is described. This tentaculitoid shares common structural features (inwardly directed pseudopunctae and vesicles) with Anticalyptraea, but differs from the latter in having a spirally coiled, microconchid-like shell with a variously oriented aperture, thin and sharp transverse ridges and lacking an inverted cone-like morphology. Unlike other tentaculitoids (microconchids, trypanoporids, cornulitids), these encrusters, unique with respect to morphology and shell structure, have so far not been taxonomically classified at the ordinal level. Now, taking into account that such tentaculitoids are taxonomically and morphologically more diverse than previously assumed, we propose to include them in a separate order Anticalyptraeida. Unlike microconchids and cornulitids, anticalyptraeids are the least studied group of tentaculitoids and thus poorly recognized. In part, this may be due to their misidentification with associated spirally coiled microconchids, to which anticalyptraeids are very similar at juvenile stages. http://www.zoobank.org/lsid:zoobank.org:act:C1E9D9A4-555E-4F5A-BEDC-8046CCA58BD9

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爱沙尼亚志留纪新发现的包壳触手类和昆斯特Anticalyptraea Quenstedt的分类地位，1867

摘要介绍了爱沙尼亚萨雷马岛志留纪（勒德福阶，勒德洛）的一个新的包壳触手类植物Lindstroemiella eichwaldi。这种触手类与Anticalyptraea有着共同的结构特征（向内指向的假点状和囊泡），但与后者不同的是，它有一个螺旋状卷曲的微环状外壳，具有不同方向的孔隙、薄而尖锐的横向脊，并且缺乏倒锥状形态。与其他触手类（微钩目、锥虫目、玉米粒目）不同，这些外壳生物在形态和外壳结构方面是独特的，迄今为止还没有在序数水平上进行分类。现在，考虑到这种触手类在分类学和形态学上比以前假设的更为多样，我们建议将它们纳入一个单独的Anticalyptraeida目。与微囊蛛和玉米粒蛛不同，反囊蛛是研究最少的一类触手类动物，因此很少被识别。在一定程度上，这可能是由于它们与相关的螺旋状卷曲微环的错误识别，而在幼年阶段，反仙人掌类与之非常相似。http://www.zoobank.org/lsid:zoobank.org:act:C1E9D9A4-555E-4F5A-bdc-8046CCA58BD9

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来源期刊

Gff 地学-地质学

CiteScore

2.80

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： GFF is the journal of the Geological Society of Sweden. It is an international scientific journal that publishes papers in English covering the whole field of geology and palaeontology, i.e. petrology, mineralogy, stratigraphy, systematic palaeontology, palaeogeography, historical geology and Quaternary geology. Systematic descriptions of fossils, minerals and rocks are an important part of GFF''s publishing record. Papers on regional or local geology should deal with Balto-Scandian or Northern European geology, or with geologically related areas. Papers on geophysics, geochemistry, biogeochemistry, climatology and hydrology should have a geological context. Descriptions of new methods (analytical, instrumental or numerical), should be relevant to the broad scope of the journal. Review articles are welcome, and may be solicited occasionally. Thematic issues are also possible.