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Ordovician phyllocarids (Arthropoda; Crustacea) from Argentina

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Kurzfassung

Neue Phyllocarida werden aus dem Ordovizium (Frühes Arenig bis Unteres Caradoc) der argentinischen Präund Ost-Kordilleren beschrieben, namentlichCaryocaris delicatus n. sp.,Caryocaris sp. 1, ?Caryocaris sp. 2,Pumilocaris granulosus n. gen., n. sp., ?Pumilocaris sp. sowie eine unbestimmte Form. Sie alle treten in graptolithen-haltigen Schiefern auf. Die bisher in der Literatur beschriebenen südamerikanischen Phyllocarida werden kritisch besprochen, undCaryocaris delicatus n. sp. (Llanvirn) wird mit congenerischen Arten verglichen, die aus dem Ordovizium (Tremadoc — Caradoc) Nordamerikas, Europas, Chinas und Australiens bekannt sind. Die Präsenz vonCaryocaris in Südamerika ist nun belegt, was die Ansicht bestätigt, daß die Gattung im Unteren Ordovizium weltweit verbreitet war — in bezug auf die mögliche pelagische Lebensweise. Eine neue Definition vonCaryocaris wird vorgeschlagen und die frühere Unterteilung der Gattung [C. (Caryocaris) undC. (Rhinopterocaris)] aufgegeben. Ein Satz von ursprünglichen Merkmalen (z.B. Fehlen einer Rostralplatte, kurze blattförmige Furkaläste, kurzes Telson, extrem dünner Carapax) deutet stark darauf hin, daßCaryocaris außerhalb der Ceratiocarididae liegt und die Basis einer neuen taxonomischen Einheit bilden könnte.

Abstract

New phyllocarids are described from the Ordovician (early Arenig to lower Caradoc) of the Precordillera and Eastern Cordillera of Argentina, namelyCaryocaris delicatus n. sp.,Caryocaris sp. 1, ?Caryocaris sp. 2,Pumilocaris granulosus n. gen., n. sp., ?Pumilocaris sp. and an undetermined form. They all occur in graptolite-bearing shales. A critical review of the South American phyllocarids formerly described in the literature is made andCaryocaris delicatus n. sp. (Llanvirn) is compared with congeneric species known from the Ordovician (Tremadoc-Caradoc) of North America, Europe, China and Australia. The presence ofCaryocaris in South America is therefore attested, which confirms the view that the genus had a worldwide distribution in the lower Ordovician in relation with a possible pelagic lifestyle. A new definition ofCaryocaris is proposed and the former subdivision of the genus [C. (Caryocaris) andC. (Rhinopterocarys)] abandoned. A set of original characters (e.g. lack of rostral plate, short leaflike furcal rami, short telson, extremely thin carapace) strongly indicates thatCaryocaris lies outside the Ceratiocarididae and may form the basis of a new taxonomic unit.

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Racheboeuf, P., Vannier, J. & Ortega, G. Ordovician phyllocarids (Arthropoda; Crustacea) from Argentina. Paläont. Z. 74, 317–333 (2000). https://doi.org/10.1007/BF02988104

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