Aktasia disgregatus

(Stover, 1966) Varol, n. comb. Sep 07, 2023

Set number: 623

  • Aktasia disgregatus 33357 1
  • Aktasia disgregatus 33359 2
  • Aktasia disgregatus 33362 3
  • Aktasia disgregatus 33369 4
  • Aktasia disgregatus 33358 5
  • Aktasia disgregatus 33360 6
  • Aktasia disgregatus 33363 7
  • Aktasia disgregatus 33364 8
    10µm
Aktasia disgregatus, Late Coniacian, Culver Cliff, Isle of Wight, England
Final Epithet
Aktasia disgregatus (Stover, 1966) Varol, n. comb.
Basionym

Discolithus disgregatus Stover, 1966

Synonyms

Eiffellithus turriseiffelii inturratus Reinhardt, 1965

Eiffellithus testaceus Reinhardt, 1966

Zygolithus cuneatus Lyul'eva, 1967

Remarks

Large species of Aktasia [>6.0µm] having a symmetrical diagonal cross. Aktasia disgregatus is distinguished from Aktasia trabeculatus (Gorka, 1957) Varol, n. comb. by being greater than 6.0µm. Aktasia disgregatus is differentiated from Aktasia turonicus (Varol & Girgis, 1994) Varol, n. comb. and Aktasia irregularis (Cepek in Cepek & Hay, 1970) Varol, n. comb. by having a symmetrical diagonal cross. Aktasia turonicus has an axial cross whilst Aktasia irregularis has an asymmetrical cross.

References

Cepek, P. & Hay, W.W. 1970. Zonation of the Upper Cretaceous using calcareous Nannoplankton. Palaont. Abh. Abt. B Palaobotanik. 3(3/4): 333-340.

Górka, H. 1957. Les Coccolithophoridés du Maestrichtien supérieur de Pologne. Acta Palaeontologica Polonica. 2: 239-284

Lyul'eva, S.A. 1967. Coccolithophoridae in the Turonian strata of the Dneiper-Don Basins. Geologische Zhurnal. 27: 91-98

Reinhardt, P. 1965. Neue Familien für fossile Kalkflagellaten (Coccolithophoriden, Coccolithineen). Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 7: 30-40.

Reinhardt, P. 1966b. Zur Taxonomie und Biostratigraphie des fossilen Nannoplanktons aus dem Malm, der Kreide und dem Alttertiär Mitteleuropas Freiberger Forschungshefte. C196: 5-109.

Stover, L. E., 1966. Cretaceous coccoliths and associated nannofossils from France and the Netherlands. Micropaleontology 12(2), 133-167.

Varol, O. & Girgis, M. 1994. New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253.

Taxonomy
Aktasia
Biostratigraphy
  • Phanerozoic
    • Mesozoic
      • Cretaceous
        • Late Cretaceous
          • -
            • Santonian
              • Late Santonian
            • Cenomanian
              • Late Cenomanian
Stratigraphic Range
Late Cenomanian - Late Santonian
Age (Ma)
94.44? - 84.40
Zone(s)
CC10 - CC16
Holotype
Aktasia disgregatus 33362 Aktasia disgregatus 33362

Discolithus disgregatus Stover, 1966

Santonian

East bank of Yonne River at Rosoy, France