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Revision der familie pseudobigaleaidaeHoare, Mapes & Yancey, 2002 (Mollusca; Rostroconchia)

Revision of the family pseudobigaleaidaeHoare, Mapes & Yancey, 2002 (Mollusca; Rostroconchia)


Im Rahmen der paläobiologischen Bearbeitung der Ordnung Conocardiida innerhalb der Rostroconchia wird die Schleppen-tragende Familie PseudobigaleaidaeHoare, Maper & Yancey, die bislang weder eine Einbindung in die bisherige Systematik noch eine fundierte Diagnose und Abgrenzung gegenüber den Hippocardiidae besaß, revidiert und der zweiten Schleppen-tragenden Familie HippocardiidaePojeta & Runnegar gegenüber gestellt. Verglichen mit Hippocardiiden besitzen Pseudobigaleaiden stets eine Körperfurche vor der Schleppe, welche in einem ventralen Sulcus endet, während ihnen eine Schnauzenrippe stets fehlt. Die Familie Pseudobigaleaidae wird in vier Unterfamilien, PseudobigaleainaeHoare, Mapes & Yancey [n. subfam.], Bigaleinae n. subfam., Bitrigonocardiinae n. subfam. und Iapetocardiinae n. subfam. untergliedert. 26 Taxa auf Artebene werden den GattungenPseudobigalea, Hadropipetta, Kandosoconcha, Nehedia, Redstonia, Bigalea, Bitrigonocardia n. gen.,Iapetocardia n. gen.,Avalanchia, Cassowarioides sowieBaiosoma mit unsicherer systematischer Position zugeordnet. Außerdem werden die TaxaRedstonia knaeckei n. sp. undCassowarioides whitei n. sp. eingeführt. Für alle Unterfamilien, Gattungen und Arten werden neue und erstmalig einheitliche Termini verwendet, die sowohl eine detaillierte, vergleichbare Beschreibung als auch eine genaue Abgrenzung der einzelnen taxonomischen Ebenen erlauben. Erste phylogenetische Überlegungen werden angeführt; die Familie hat eine revidierte stratigrafische Reichweite vom Ordovizium bis ins Pennsylvanium.


The following revision is based on extensive palaeobiological and phylogenetic investigations on the so-called modern rostroconchs of the order Conocardiida. The taxa of the hood-carrying family PseudobigaleaidaeHoare, Mapes & Yancey are revised and compared with the second hood-carrying family, the HippocardiidaePojeta & Runnegar. Until present, the Pseudobigaleaidae was lacking precise definition and accurate description as well as proper placement within the current systematic arrangement of the Conocardiida. In contrast with the hippocardiids the pseudobigaleaids always lack the prominent rib which delimits the snout dorsally, but always possess a body furrow in front of the hood which terminates in a ventral sulcus. The family Pseudobigaleaidae is subdivided into four subf amilies, the PseudobigaleainaeHoare, Mapes & Yancey [n. subfam.], the Bigaleinae n. subfam., the Bitrigonocardiinae n. subfam. and the Iapetocardiinae n. subfam. Twenty-six taxa on species level are assigned to the generaPseudobigalea, Hadropipetta, Kandosoconcha, Nehedia, Redstonia, Bigalea, Bitrigonocardia n. gen.,Iapetocardia n. gen.,Avalanchia, Cassowarioides as well asBaiosoma of uncertain systematic position. Furthermore, the taxaRedstonia knaeckei n. sp. andCassowarioides whitei n. sp. are erected. The descriptions of all subfamilies, genera and species are now based on a revised, completed and consistently used terminology of morphologie characters which allow precise discrimination and comparability of descriptions on all taxonomie levels. Preliminary phylogenetic results are provided which reveal a revised stratigraphie occurrence of the Pseudobigaleaidae from the Ordovician until the Pennsylvanian.

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Rogalla, N.S., Amler, M.R.W. Revision der familie pseudobigaleaidaeHoare, Mapes & Yancey, 2002 (Mollusca; Rostroconchia). Paläontol Z 80, 167–208 (2006).

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  • Mollusca
  • Rostroconchia
  • Conocardiida
  • Pseudobigaleaidae
  • Systematik
  • Taxonomie


  • Mollusca
  • Rostroconchia
  • Conocardiida
  • Pseudobigaleaidae
  • systematics
  • taxonomy