• Title: Xenacanthus laevissimus (Agassiz 1837)
  • Type status: Holotype
  • State province: England
  • Specific epithet: laevissimus
  • Scientific name authorship: (Agassiz 1837)
  • Order: Xenacanthida
  • Lowest biostrati graphic zone: Canal Coal
  • Locality: Tingley
  • Latest period or highest system: Carboniferous
  • Latest era or highest erathem: Paleozoic
  • Latest epoch or Highest series: Pennsylvanian
  • Latest eon or highest eonothem: Phanerozoic
  • Higher geography: Europe; British Isles; England; Yorkshire; Tingley
  • Higher classification: Chondrichthyes; Xenacanthida; Xenacanthidae
  • Group: Coal Measures Supergroup, Middle Coal Measures Group
  • Genus: Xenacanthus
  • Family: Xenacanthidae
  • Earliest period or lowest system: Carboniferous
  • Earliest era or lowest erathem: Paleozoic
  • Earliest epoch or lowest series: Pennsylvanian
  • Earliest eon or Lowest eonothem: Phanerozoic
  • Country: British Isles
  • Continent: Europe
  • Class: Chondrichthyes

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