Amphizygus megalops

Blair & Watkins, 2009 Aug 03, 2020

Set number: 52

  • Amphizygus megalops 12523 1
  • Amphizygus megalops 12525 2
  • Amphizygus megalops 12527 3
  • Amphizygus megalops 12530 4
  • Amphizygus megalops 12524 5
  • Amphizygus megalops 12526 6
  • Amphizygus megalops 12528 7
  • Amphizygus megalops 12529 8
    10µm
Amphizygus megalops, Early Coniacian, Culver Cliff, Isle of Wight, South England
Final Epithet
Amphizygus megalops Blair & Watkins, 2009
Basionym

Amphizygus megalops Blair & Watkins, 2009

Synonyms

Amphizygus brooksii Bukry, 1969 early morphotype - Bralower and Bergen, 1998, p. 73, pl2, figs. 7a-b

Remarks

Moderately large loxolith having a non-birefringent outer wall and a birefringent inner wall and a large central area. The yoke-cycle is very narrow and forms the symmetrical diagonal cross with the distal process. The pores along the long axis are large whereas the triangular pores along the short axis are vestigial.

Amphyzygus megalops differs from Amphizygus brooksii brooksii Bukry (1969) and Amphizygus brooksii nanus Bukry (1969) by having a birefringent additional inner wall.

References

Blair, S. A. & Watkins, D. K. (2009): High-resolution calcareous nannofossil biostratigraphy for the Coniacian/Santonian Stage boundary, Western Interior Basin. - Cretaceous Research., 30(2): 367-384.

Bukry, D., (1969): Upper Cretaceous coccoliths from Texas and Europe. - The University of Kansas Paleontological Contributions, Article 51 (Protista 2): 1-79.

Taxonomy
Amphizygus
Biostratigraphy
  • Phanerozoic
    • Mesozoic
      • Cretaceous
        • Late Cretaceous
          • -
            • Coniacian
              • Late Coniacian
        • Early Cretaceous
          • -
            • Albian
              • Late Albian
Stratigraphic Range
Late Albian - Late Coniacian
Age (Ma)
107.35 - 85.70
Holotype
Amphizygus megalops 12523 Amphizygus megalops 12523

Amphizygus megalops Blair & Watkins, 2009

Early Santonian

Smoky Hill Member, Northwestern Kansas