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Main Title: Malongitubus: a possible pterobranch hemichordate from the early Cambrian of South China
Author(s): Hu, Shixue
Erdtmann, Bernd-Dietrich
Steiner, Michael
Zhang, Yuandong
Zhao, Fangchen
Zhang, Zhiliang
Han, Jian
Type: Article
Language Code: en
Abstract: Malongitubus kuangshanensis Hu, 2005 from the early Cambrian Chengjiang Lagerstätte of China is redescribed as a pterobranch and provides the best evidence to demonstrate that hemichordates were present as early as Cambrian Stage 3. Interpretation of this taxon as a hemichordate is based on the morphology of the branched colony and the presence of resistant inner threads consistent with the remains of an internal stolon system. The presence of fusellar rings in the colonial tubes cannot be unambiguously proven for Malongitubus, probably due to early decay and later diagenetic replacement of the thin organic material of the tubarium, although weak annulations are still discernible in parts of the tubes. The description of M. kuangshanensis is revised according to new observations of previously reported specimens and recently collected additional new material. Malongitubus appears similar in most features to Dalyia racemata Walcott, 1919 from the Cambrian Stage 5 Burgess Shale, but can be distinguished by the existence of disc-like thickenings at the bases of tubarium branching points in the latter species. Both species occur in rare mass-occurrence layers with preserved fragmentary individuals of different decay stages, with stolon remains preserved as the most durable structures. Benthic pterobranchs may have occurred in some early Cambrian shallow marine communities in dense accumulations and provided firm substrates and shelter for other benthic metazoans as secondary tierers.
Issue Date: 4-Dec-2017
Date Available: 4-Jul-2019
DDC Class: 550 Geowissenschaften
Subject(s): Malongitubus kuangshanensis
Cambrian Chengjiang
Journal Title: Journal of Paleontology
Publisher: Cambridge University Press
Publisher Place: Cambridge
Volume: 92
Issue: 1
Publisher DOI: 10.1017/jpa.2017.134
Page Start: 26
Page End: 32
EISSN: 1937-2337
ISSN: 0022-3360
Notes: Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.
Appears in Collections:Inst. Angewandte Geowissenschaften » Publications

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