Reconstruction of the multielement apparatus of the earliest Triassic conodont, Hindeodus parvus, using synchrotron radiation X-ray micro-tomography

Sachiko Agematsu, Kentaro Uesugi, Hiroyoshi Sano, Katsuo Sashida

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8 Citations (Scopus)

Abstract

Earliest Triassic natural conodont assemblages preserved as impressions on bedding planes occur in a claystone of the Hashikadani Formation, which is part of the Mino Terrane, a Jurassic accretionary complex in Japan. In this study, the apparatus of Hindeodus parvus (Kozur and Pjatakova, 1976) is reconstructed using synchrotron radiation micro-tomography (SR - μCT). This species has six kinds of elements disposed in 15 positions forming the conodont apparatus. Carminiscaphate, angulate, and makellate forms are settled in pairs in the P1, P2, and M positions, respectively. The single alate element is correlated with the S0 position. The S array is a cluster of eight ramiforms, subdivided into two inner pairs of digyrate S1-2 and two outer pairs of bipennate S3-4 elements. The reconstruction is similar to a well-known ozarkodinid apparatus model. In addition, the μCT images show that the 'anterior' and 'posterior' processes of the S1-2 elements faced the caudal and rostral ends of the living conodont body, respectively.

Original languageEnglish
Pages (from-to)1220-1227
Number of pages8
JournalJournal of Paleontology
Volume91
Issue number6
DOIs
Publication statusPublished - Nov 2017

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All Science Journal Classification (ASJC) codes

  • Palaeontology

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