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Isolated Chewtonian (Lower Ordovician) graptolites from western Newfoundland

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Abstract

Isolated material of Chewtonian graptolites from the Cow Head Group of western Newfoundland shows some new and unexpected structural details. A high number of the two- and three-stipedPendeograptus fruticosus specimens show metasicular origin for th11 combined with a normal isograptid proximal development. Sigmagraptine sicular development includes a large parallel-sided prosicula and a parallel-sided metasicula. One species acquired an azygograptid-like proximal end, characterised by a loss of the initial branching, but kept the capacity to produce distal dichotomies.Maeandrograptus sinosus n. sp. andKeblograptus geminus n. sp. are described as new species.

Zusammenfassung

Unerwartete Strukturdetails konnten bei der chemischen Isolierung von Graptolithenmaterial aus dem Chewtonium der Cow Head Gruppe (westliches Neufundland) gewonnen werden. Eine Anzahl von zwei- und drei-ästigenPendeograptus fruticosus zeigen einen metasikularen Ursprung von th11 zusammen mit einer normalen Proximalentwicklung des isograptiden Typus. Die Proximalentwicklung der Sigmagraptinen beinhaltet eine große Prosikula mit parallelen Seiten, sowie eine ebenso parallel-seitige Metasikula. Eine Art besitzt ein azygograptides Proximalteil ohne Proximalverzweigung, erhält jedoch die Möglichkeit von distalen, dichotomen Verzweigungen.Maeandrograptus sinosus n. sp. undKeblograptus geminus n. sp. werden als neue Taxa beschrieben.

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  1. Department of Geology, University at Buffalo, State University of New York (SUNY), 772 Natural Sciences and Mathematics Complex, 14260-3050, Buffalo, New York, U.S.A.

    Jörg Maletz

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Maletz, J. Isolated Chewtonian (Lower Ordovician) graptolites from western Newfoundland. Paläont. Z. 78, 173–187 (2004). https://doi.org/10.1007/BF03009137

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