The evolution of hermit crabs (Crustacea, Decapoda, Anomura, Paguroidea) on the basis of carapace morphology: a state-of-the-art-report

IF 1.5 3区地球科学 Q2 PALEONTOLOGY

Geodiversitas Pub Date : 2022-01-06 DOI:10.5252/geodiversitas2022v44a1

René H. B. Fraaije, B. V. van Bakel, J. Jagt, S. Charbonnier, G. Schweigert, G. Garcia, Xavier Valentin

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引用次数: 5

Abstract

ABSTRACT In our ongoing studies of both extinct and extant hermit crabs (Paguroidea Latreille, 1802), we have observed and recorded a number of morphological changes that have taken place between Early Jurassic times (c. 185 million years ago) and the present day. Species compositions of paguroid assemblages from marine Upper Jurassic and Lower Cretaceous rocks in Europe are here compared with those of modern marine settings. Basal paguroids with cylindrical carapaces predominated in reefal environments during the Late Jurassic, but were gradually replaced by hermit crabs with non-cylindrical carapaces. The most basal paguroids reveal a branchial groove, but branchial condensation towards a single (i.e., cervical) groove is here shown to have occurred early in their evolutionary history. In several extant, genera remnants of a branchial groove, in combination with several other basal features, can be seen. For this reason, these are here considered to be the most primitive members amongst extant paguroids. In this study, we resurrect the family Probeebeidae and erect a new family, Paguropsidae n. fam, to accommodate extant basal hermit crabs such as Paguropsis Henderson, 1888, Eopaguropsis Fraaije, Krzemiński, Van Bakel, Krzemińska & Jagt, 2012 and Paguropsina Lemaitre, Rahayu & Komai, 2018. Described are also one pair of Early Jurassic (Pliensbachian) and two pairs of Middle Jurassic (Callovian) isochelous paguroid chelae, all collected recently. A new specimen of Schobertella reveals some important morphological traits of the shield that had not been observed previously. The earliest known example to date of clearly heterochelous chelae in the fossil record of hermit crabs originates from upper Kimmeridgian/Tithonian strata in the Boulonnais (northwestern France). For the first time, a phylogenetic scheme of marine Paguroidea, as based on morphological data of carapaces, is presented.

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寄居蟹（甲壳纲、十足目、无尾目、异足目）在甲壳形态基础上的进化：最新报告

在我们对已灭绝和现存寄居蟹(Paguroidea Latreille, 1802)的持续研究中，我们观察并记录了早侏罗世(约1.85亿年前)到现在发生的许多形态变化。本文将欧洲海相上侏罗统和下白垩统岩石中的类石组合的物种组成与现代海相环境中的类石组合进行了比较。在晚侏罗世的珊瑚礁环境中，具有圆柱形甲壳的基缘蜈蚣类占优势，但逐渐被具有非圆柱形甲壳的寄居蟹所取代。最基部的类鱼显示鳃裂沟，但此处显示向单一(即颈)沟的鳃裂凝结在其进化史的早期发生。在几个现存的属中，可以看到鳃沟的残余物，与其他几个基底特征结合在一起。因此，它们被认为是现存的类人猿中最原始的成员。在这项研究中，我们复活了Probeebeidae家族，并建立了一个新的家族，Paguropsidae n. fam，以容纳现有的基寄居蟹，如Paguropsis Henderson, 1888, Eopaguropsis Fraaije, Krzemiński, Van Bakel, Krzemińska & Jagt, 2012和Paguropsina Lemaitre, Rahayu & Komai, 2018。还发现了一对早侏罗世(Pliensbachian)和两对中侏罗世(Callovian)等掌类螯动物，均为近期发现。一个新的肖伯特拉标本揭示了一些以前没有观察到的盾的重要形态特征。在寄居蟹的化石记录中，迄今已知最早的明显异螯螯的例子来自法国西北部布龙尼斯的上基默里吉纪/提托尼统地层。本文首次根据甲壳的形态资料，提出了一种海洋巨蛛总科的系统发育方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geodiversitas 地学-古生物学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： Geodiversitas is a fully electronic journal, with a continuous publication stream, devoted to varied aspects of Earth Sciences. It publishes original results particularly on systematics, phylogeny, paleobiodiversity and paleoenvironment. Thematic issues may also be published under the responsibility of a guest editor.