Bowmania hawkerae

Set number: 2074

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10µm

Brezno, Czechia

Holotype

Set number: 2075

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10µm

Brezno, Czechia

Set number: 2076

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10µm

Brezno, Czechia

Set number: 2087

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10µm

Arabian Peninsula (The specific location cannot be disclosed)

Final Epithet

Bowmania hawkerae Varol, 2025a

Basionym

Bowmania hawkerae Varol, 2025a

Diagnosis

Bowmania hawkerae, a cuboid species, exhibits blocks without a cross. The blocks display parallel extinctions and length-slow (+) elongation.

Etymology

In honour of Claire Hawker, Baildon, Yorkshire, United Kingdom.

Dimensions Of Holotype

Length of sides = 4.98 μm; Diagonal length = 6.62 μm

Remarks

After a careful study of the type material of Micula adumbrata, it is considered to be a side view of the small Quadrum eptabrachium and is therefore regarded as a junior synonym of Quadrum eptabrachium. This conclusion is based on the following evidence: The apices of the holotype of Micula adumbrata are aligned in the N-S and E-W directions and display interference colours similar to those of Quadrum eptabrachium. In the same orientation, Micula, Bowmania, and Quadrum gartneri exhibit constant extinction (dim).

References

Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222

Taxonomy

Bowmania

Biostratigraphy

Stratigraphic Range

Late Turonian - Early Coniacian

Age (Ma)

90.23 - 88.90?

Zone(s)

CC12 - CC13

Holotype

Bowmania hawkerae Varol, 2025a

Brezno, Czechia