Three echinoid assemblages with the earliest cidaroid (Echinodermata: Echinoidea) fossil record from the Middle Miocene of Taiwan

IF 1.6 4区地球科学 Q2 PALEONTOLOGY

Geobios Pub Date : 2025-02-01 DOI:10.1016/j.geobios.2024.05.010

Hung-Kai Chen , Chia-Hsin Hsu , Jih-Pai Lin

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引用次数: 0

Abstract

Cidaroids (Echinoidea: Cidaroida) are the basalmost taxa among extant echinoids. However, the relative scarcity of intact cidaroid tests in the Cenozoic fossil record poses challenges for understanding their biogeographic patterns and evolutionary trends. This study reports the 200-meter thick Middle Miocene Nangang Formation, including three echinoid assemblages, namely “Cidaroida assemblage”, “Astriclypeoidea assemblage”, and “Spatangoida assemblage”. The potential paleoenvironmental implications and comparisons to widespread Miocene echinoid faunas of the circum-Mediterranean area are discussed. Notably, an articulated cidaroid fossil with intact spines recovered from the Cidaroida assemblage. The specimen exhibits shallow and transverse oval areoles along with distinct, rod-like, spinose primary spines, suggesting that it belongs to the genus Prionocidaris. In summary, the Prionocidaris fossil stands as the earliest occurrence of this order in Taiwan, and the associated echinoid assemblages offer a valuable record in the underexplored Western Pacific Region.

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来源期刊

Geobios 地学-古生物学

CiteScore

3.30

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.