Anchispirocyclina

Anchispirocyclina
Temporal range: Late Jurassic–Early Cretaceous
Anchispirocyclina henbesti
Scientific classification
Domain:
Eukaryota
(unranked):
SAR
(unranked):
Rhizaria
Phylum:
Retaria
Subphylum:
Foraminifera
Class:
Globothalamea
Order:
Loftusiida
Family:
Spirocyclinidae
Genus:
Anchispirocyclina

Jordan and Applin, 1952

Anchispirocyclina is a genus of agglutinated discoidal forams known from the upper Jurassic (lower Kimmeridgian) to the lower Cretaceous (lower Valanginan) of Europe, north Africa, USA (North Carolina) and Cuba.

The test of Anchispirocyclina is discoidal, thin and often slightly undulating. The early stage is close coiled, later flaring some becoming circular in outline. Walls are microgranular to finely agglutinated. Chambers have complex interiors produced by a network of rafters and beams. Those near the median plane have an irregular labyrinthic structure produced by radial pillars or buttresses extending from septum to septum between adjacent apertural openings.

Spirocyclina, Haurinia and Martiguesia are related genera.

References

  • Alfred R. Loeblich,jr & Helen Tappan 1964. Sarcodina, Chiefly "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology, Part C, Protista 2. Geological Society of America and University of Kansas Press.
  • A.R. Loeblich & H Tappan, 1988, in GSI.ir Paleontology. [1]
  • Rotaliata, Textulariana [2]