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Article: A new enigmatic hyolith from the Cambrian of West Gondwana and its bearing on the systematics of hyoliths

Papers in Palaeontology - Volume 4 Part 1 - Cover Image
Publication: Palaeontology
Volume: 4
Part: 1
Publication Date: Febuary 2018
Page(s): 85 100
Author(s): Gerd Geyer
DOI: 10.1002/spp2.1098
Addition Information

How to Cite

GEYER, G. 2018. A new enigmatic hyolith from the Cambrian of West Gondwana and its bearing on the systematics of hyoliths . Papers in Palaeontology, 4, 1, 85-100. DOI: 10.1002/spp2.1098

Author Information

  • Gerd Geyer - Institut für Geographie und Geologie Lehrstuhl für Geodynamik und Geomaterialforschung Bayerische Julius‐Maximilians‐Universität Würzburg Am Hubland D‐97074 Würzburg Germany

Publication History

  • Issue published online: 08 February 2018
  • Manuscript Accepted: 18 September 2017
  • Manuscript Received: 12 June 2017

Funded By

Deutsche Forschungsgemeinschaft (DFG). Grant Number: GE 549/22‐1

Online Version Hosted By

Wiley Online Library
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Abstract

The genus Aladraco nom. nov. is described and discussed, along with two species recognized from coeval strata of the lower traditional middle Cambrian, A. schloppensis (Wurm) from the Tannenknock Formation of the Franconian Forest region, Germany, and A. ougnatensis sp. nov. from the Jbel Wawrmast Formation of the eastern Anti‐Atlas, Morocco. Aladraco was formerly known as Oxyprymna Kiderlen, a preoccupied generic name requiring renaming of the genus. The genus bears morphological characters such as the size, shape and external ornamentation of the conch which clearly indicate a systematic position in the class Hyolitha. A number of characters, such as a tripartition into an axial chamber and lateral acuminate processes, and the course of the apertural margin, differ considerably from those seen in the two orders Hyolithida and Orthothecida, and appear to indicate distinct differences in functional morphology. However, similarities of the morphological characters with the known representatives of the Hyolithida suggest that the species are derived from this systematic group and should be dealt with as a hitherto unrecognized distinct suborder and family, introduced as Aladracina subord. nov. and Aladracidae fam. nov.

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