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Ammagnostidae

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Journal Article
Published: 01 September 2003
Journal of Paleontology (2003) 77 (5): 895–907.
... displays morphological features of the family Ammagnostidae (e.g., Proagnostus Butts, 1926 or Hadragnostus Öpik, 1967 ) in possessing a long, broad and pyriform pygidial axis. A pygidium with an attached thoracic segment ( Fig. 3.10 ) represents a meraspid stage of the species. Clavagnostid...
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