Pollicifossa constricta

(Hattner, Wind & Wise, 1980) Varol, n. comb. Aug 06, 2020

Set number: 138

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10µm

Pollicifossa constricta, Late Campanian, The specific location cannot be disclosed.

Set number: 139

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10µm

Pollicifossa constricta, Late Campanian, The specific location cannot be disclosed.

Set number: 137

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5
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10µm

Pollicifossa constricta, Late Campanian, The specific location cannot be disclosed.

Set number: 140

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2
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4

10µm

Pollicifossa constricta, Late Campanian, The specific location cannot be disclosed.

Final Epithet

Pollicifossa constricta (Hattner, Wind & Wise, 1980) Varol, n. comb.

Basionym

Broinsonia parca constricta Hattner, Wind & Wise, 1980

Synonyms

Aspitolithus parcus constrictus (Hattner, Wind & Wise, 1980) Perch-Nielsen, 1984

Optical Properties

Similar to the genus Pollicifossa, the pelaga exhibits inclined extinction lines and length-fast (−) elongation in plan view.

Remarks

Species of Pollicifossa have a diamond-shaped central area with a porous plate, surrounded by a wide, birefringent, fluted tube cycle, and a narrow distal shield. The fluted structures are distinct on the tube cycle in LM. The number of pores per quadrant is usually one to two. The width of the central area is less than that of pelaga.

References

Hattner, J. G. & Wise, S. W. 1980. Upper Cretaceous calcareous nannofossil biostratigraphy of South Carolina. South Carolina Geology 24: 41-117.

Perch-Nielsen, K. 1984. Validation of new combinations. INA Newsletter. 6(1): 42-46.

Taxonomy

Pollicifossa

Biostratigraphy

Stratigraphic Range

Early Campanian - Early Maastrichtian

Age (Ma)

82.29 - 71.94

Holotype

Broinsonia parca constricta Hattner et al., 1980

Middle Campanian

Clubhouse Crossroads Core 1, South Carolini, USA