Paläontologische Zeitschrift

, Volume 82, Issue 4, pp 385–401 | Cite as

A new delthyridoid spiriferid genus from the Dra Valley, Morocco, and its phylogenetic affinities (Brachiopoda, Lower Devonian)

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Abstract

Multiplicatispirifer, a new delthyridoid brachiopod genus with a gently divergent capillate micro-ornamentation and bifurcating costae on flanks, sulcus and fold, has been identified in the Mdâouer-el-Kbîr Formation of the Dra Valley (southern Anti-Atlas, Morocco). Its type speciesMultiplicatispirifer foumzguidensis n. gen., n. sp., at present the only species of this genus, is described. This form has hitherto been determined asFimbrispirifer orStruveina by various authors. In this work, the new genus is compared with the multiplicate and capillate spiriferid genera with bifurcating costae which also have costae in the sulcus and on the fold:Costispirifer andPerryspirifer from North America,Elymospirifer from South China,Borealispirifer from Asia andMultispirifer from Central Europe. The relation ofMultiplicatispirifer to the fimbriateFimbrispirifer, Struveina andVandercammenina, from which it is distinguished by its capillate micro-ornamentation, is discussed. The new genus is hitherto only known from the Moroccan southern Anti-Atlas. Its colsest relatives, taxa ofCostispirifer, occur in the Eastern American Realm (Gaspé, Canada and the eastern United States) and the Nevada Province (western United States).Multiplicatispirifer occurrences are restricted to the Lower/Upper Emsian boundary interval (upper Lower Devonian). The reasons for a possible migration corridor between North America and North Africa before Emsian time are discussed.

Keywords

Spiriferida Brachiopoda Phylogeny Paläobiogeography Morocco Lower Devonian 

Kurzfassung

In der Mdâouer-el-Kbîr-Formation in der Dra-Ebene (südlicher Anti-Atlas, Marokko) wurde eine neue delthyridoide Brachiopoden-Gattung identifiziert.Multiplicatispirifer ist durch eine leicht divergierende kapillate Mikrostruktur und bifurkierende Rippen auf den Flanken, im Sinus und auf dem Sattel charakterisiert. Die TypusartMultiplicatispirifer foumzguidensis n. gen., n. sp., zur Zeit die einzige bekannte Art dieser Gattung, wird beschrieben. Bisher wurde diese Form von unterschiedlichen Bearbeitern zuFimbrispirifer oderStruveina gestellt. In der vorliegenden Arbeit wird die neue Gattung mit multiplikaten und kapillaten Spiriferen verglichen, die bifurkierende Rippen wie auch einen berippten Sinus und Sattel aufweisen:Costispirifer undPerryspirifer aus Nord-Amerika,Elymospirifer aus Süd-China,Borealispirifer aus Asien undMultispirifer aus Mittel-Europa. Die Verwandtschaft vonMultiplicatispirifer zu den fimbriaten GattungenFimbrispirifer, Struveina undVandercammenina, von denen sie sich durch ihre kapillate Mikrostruktur unterscheidet, wird diskutiert. Die neue Gattung ist bisher nur aus dem marokkanischen Anti-Atlas bekannt. Ihre nächsten Verwandten, Taxa vonCostispirifer, treten im ostamerikanischen Faunenreich (Gaspé, Kanada, und Ostküste der Vereinigten Staaten) sowie in der Faunenprovinz Nevada (westliche USA) auf. Das Vorkommen vonMultiplicatispirifer ist auf den Grenzbereich Unter-/Ober-Emsium beschränkt (oberes Unter-Devon). Die Gründe für einen möglichen Migrations-Korridor zwischen Nord-Amerika und Nord-Afrika zur Zeit des Emsiums werden diskutiert.

Schlüsselwörter

Spiriferida Brachiopoda Phylogenie Paläobiogeographie Marokko Unter-Devon 
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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2008

Authors and Affiliations

  1. 1.Forschungsinstitut und Naturmuseum Senckenberg, Paläozoologie IIIFrankfurt am MainGermany

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