Unique 3D preservation of Rhuddanian (Silurian) Callograptidae (Gorny Altai, Russia)

IF 1.7 3区地球科学 Q2 PALEONTOLOGY Palaeoworld Pub Date : 2023-12-16 DOI:10.1016/j.palwor.2023.12.003

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Abstract

We studied a collection of the Silurian (Rhuddanian) multi-branched dendroids, including reticulate, benthic dendroid graptolites of the Callograptidae Hopkinson (in Hopkinson and Lapworth, 1875), from the Gorny Altai, Russia. Species of Dictyonema Hall, Koremagraptus Bulman, Callograptus Hall, and Desmograptus Hopkinson were identified and described. The graptolites are represented by in situ burial of colonies with 3D preservation of tubaria (= rhabdosomes). Complete (intact) colonies of dendroid graptolites are characterized by successive development stages: juvenile, neanic, ephebic (adults), while the general configuration of the tubarium changed from the proximal to distal. In a number of cases, later stage of colony development — the gerontic stage (senilis) is found. We carried out morphological analysis of dendroid graptolite tubaria (Callograptidae) of various development stages, showing eight morphotypes of the colonies, namely, the cylinder, disc, disc on a stem, hemisphere, cone, wineglass, blooming flower, and funnel type.

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独特的 Rhuddanian（志留纪）Callograptidae 的 3D 保存（俄罗斯，戈尔诺-阿尔泰）

我们研究了俄罗斯戈尔诺-阿尔泰（Gorny Altai）采集的志留纪（Rhuddanian）多枝树突类，包括网状、底栖树突类爬虫，属于 Callograptidae Hopkinson（Hopkinson 和 Lapworth，1875 年）。对 Dictyonema Hall、Koremagraptus Bulman、Callograptus Hall 和 Desmograptus Hopkinson 的物种进行了鉴定和描述。石龙子的代表是原地埋藏的具有三维管状体（= rhabdosomes）的菌落。完整的石龙子群落具有连续发育阶段的特征：幼体、新体、上体（成体），而管胞的总体构造则从近端变为远端。在一些情况下，还发现了群体发育的后期阶段--老年阶段（senilis）。我们对不同发育阶段的树栖爬虫管胞（Callograptidae）进行了形态分析，结果显示了八种形态的管胞，即圆柱型、圆盘型、茎上圆盘型、半球型、圆锥型、酒杯型、开花型和漏斗型。

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来源期刊

Palaeoworld PALEONTOLOGY-

CiteScore

4.00

自引率

5.90%

发文量

期刊介绍： Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata