Asinithistimorfi aubryae

Bowman & Varol, 2021 Aug 14, 2019

Set number: 47

  • Asinithistimorfi paraxenos 56871 1
  • Asinithistimorfi paraxenos 56898 2
  • Asinithistimorfi paraxenos 56872 3
  • Asinithistimorfi paraxenos 56894 4
  • Asinithistimorfi paraxenos 56870 5
  • Asinithistimorfi paraxenos 56869 6
  • Asinithistimorfi paraxenos 56873 7
  • Asinithistimorfi paraxenos 56892 8
  • Asinithistimorfi paraxenos 56879 9
  • Asinithistimorfi paraxenos 56876 10
  • Asinithistimorfi paraxenos 56880 11
  • Asinithistimorfi paraxenos 56895 12
  • Asinithistimorfi paraxenos 56878 13
  • Asinithistimorfi paraxenos 56874 14
  • Asinithistimorfi paraxenos 56881 15
  • Asinithistimorfi paraxenos 56890 16
  • Asinithistimorfi paraxenos 56885 17
  • Asinithistimorfi paraxenos 56882 18
  • Asinithistimorfi paraxenos 56887 19
  • Asinithistimorfi paraxenos 56889 20
  • Asinithistimorfi paraxenos 56884 21
  • Asinithistimorfi paraxenos 56877 22
  • Asinithistimorfi paraxenos 56888 23
  • Asinithistimorfi paraxenos 56896 24
  • Asinithistimorfi paraxenos 56902 25
  • Asinithistimorfi paraxenos 56868 26
  • Asinithistimorfi paraxenos 56899 27
  • Asinithistimorfi paraxenos 56891 28
  • Asinithistimorfi paraxenos 56901 29
  • Asinithistimorfi paraxenos 56897 30
  • Asinithistimorfi paraxenos 56900 31
  • Asinithistimorfi paraxenos 56893 32
    10µm
Asinithistimorfi aubryae, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 3425

  • Asinithistimorfi aubryae 24727 1
  • Asinithistimorfi aubryae 24730 2
  • Asinithistimorfi aubryae 24734 3
  • Asinithistimorfi aubryae 24740 4
  • Asinithistimorfi aubryae 24732 5
  • Asinithistimorfi aubryae 24731 6
  • Asinithistimorfi aubryae 24737 7
  • Asinithistimorfi aubryae 24739 8
  • Asinithistimorfi aubryae 24729 9
  • Asinithistimorfi aubryae 24733 10
  • Asinithistimorfi aubryae 24735 11
  • Asinithistimorfi aubryae 24741 12
  • Asinithistimorfi aubryae 24728 13
  • Asinithistimorfi aubryae 24736 14
  • Asinithistimorfi aubryae 24738 15
    10µm
Asinithistimorfi aubryae, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 3426

  • Asinithistimorfi aubryae 24903 1
  • Asinithistimorfi aubryae 24906 2
  • Asinithistimorfi aubryae 24907 3
  • Asinithistimorfi aubryae 24913 4
  • Asinithistimorfi aubryae 24904 5
  • Asinithistimorfi aubryae 24905 6
  • Asinithistimorfi aubryae 24908 7
  • Asinithistimorfi aubryae 24912 8
  • Asinithistimorfi aubryae 24909 9
  • Asinithistimorfi aubryae 24910 10
  • Asinithistimorfi aubryae 24911 11
    10µm
Asinithistimorfi aubryae, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 3427

  • Asinithistimorfi aubryae 25645 1
  • Asinithistimorfi aubryae 25648 2
  • Asinithistimorfi aubryae 25650 3
  • Asinithistimorfi aubryae 25652 4
  • Asinithistimorfi aubryae 25646 5
  • Asinithistimorfi aubryae 25647 6
  • Asinithistimorfi aubryae 25649 7
  • Asinithistimorfi aubryae 25653 8
  • Asinithistimorfi aubryae 25651 9
    10µm
Asinithistimorfi aubryae, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 3428

  • Asinithistimorfi aubryae 57722 1
  • Asinithistimorfi aubryae 57677 2
  • Asinithistimorfi aubryae 57678 3
  • Asinithistimorfi aubryae 57679 4
  • Asinithistimorfi aubryae 57680 5
  • Asinithistimorfi aubryae 57681 6
  • Asinithistimorfi aubryae 57682 7
  • Asinithistimorfi aubryae 57683 8
  • Asinithistimorfi aubryae 57684 9
  • Asinithistimorfi aubryae 57685 10
  • Asinithistimorfi aubryae 57686 11
  • Asinithistimorfi aubryae 57687 12
  • Asinithistimorfi aubryae 57688 13
  • Asinithistimorfi aubryae 57689 14
  • Asinithistimorfi aubryae 57690 15
  • Asinithistimorfi aubryae 57691 16
  • Asinithistimorfi aubryae 57692 17
  • Asinithistimorfi aubryae 57693 18
  • Asinithistimorfi aubryae 57694 19
  • Asinithistimorfi aubryae 57695 20
  • Asinithistimorfi aubryae 57696 21
  • Asinithistimorfi aubryae 57697 22
  • Asinithistimorfi aubryae 57698 23
  • Asinithistimorfi aubryae 57699 24
  • Asinithistimorfi aubryae 57700 25
  • Asinithistimorfi aubryae 57701 26
  • Asinithistimorfi aubryae 57702 27
  • Asinithistimorfi aubryae 57703 28
  • Asinithistimorfi aubryae 57704 29
  • Asinithistimorfi aubryae 57705 30
  • Asinithistimorfi aubryae 57707 31
  • Asinithistimorfi aubryae 57708 32
  • Asinithistimorfi aubryae 57709 33
  • Asinithistimorfi aubryae 57710 34
  • Asinithistimorfi aubryae 57711 35
  • Asinithistimorfi aubryae 57712 36
  • Asinithistimorfi aubryae 57713 37
  • Asinithistimorfi aubryae 57714 38
  • Asinithistimorfi aubryae 57715 39
  • Asinithistimorfi aubryae 57716 40
  • Asinithistimorfi aubryae 57717 41
  • Asinithistimorfi aubryae 57718 42
  • Asinithistimorfi aubryae 57719 43
  • Asinithistimorfi aubryae 57720 44
  • Asinithistimorfi aubryae 57721 45
    10µm
Asinithistimorfi aubryae, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 3429

  • Asinithistimorfi aubryae 58567 1
  • Asinithistimorfi aubryae 58568 2
  • Asinithistimorfi aubryae 58569 3
  • Asinithistimorfi aubryae 58570 4
  • Asinithistimorfi aubryae 58571 5
  • Asinithistimorfi aubryae 58572 6
  • Asinithistimorfi aubryae 58573 7
  • Asinithistimorfi aubryae 58574 8
  • Asinithistimorfi aubryae 58593 9
  • Asinithistimorfi aubryae 58594 10
  • Asinithistimorfi aubryae 58595 11
  • Asinithistimorfi aubryae 58576 12
  • Asinithistimorfi aubryae 58577 13
  • Asinithistimorfi aubryae 58578 14
  • Asinithistimorfi aubryae 58579 15
  • Asinithistimorfi aubryae 58580 16
  • Asinithistimorfi aubryae 58581 17
  • Asinithistimorfi aubryae 58582 18
  • Asinithistimorfi aubryae 58583 19
  • Asinithistimorfi aubryae 58584 20
  • Asinithistimorfi aubryae 58585 21
  • Asinithistimorfi aubryae 58586 22
  • Asinithistimorfi aubryae 58587 23
  • Asinithistimorfi aubryae 58588 24
  • Asinithistimorfi aubryae 58589 25
  • Asinithistimorfi aubryae 58590 26
  • Asinithistimorfi aubryae 58591 27
  • Asinithistimorfi aubryae 58592 28
    10µm
Asinithistimorfi aubryae, Late Paleocene, DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau

Set number: 3430

  • Asinithistimorfi aubryae 64212 1
  • Asinithistimorfi aubryae 64175 2
  • Asinithistimorfi aubryae 64176 3
  • Asinithistimorfi aubryae 64177 4
  • Asinithistimorfi aubryae 64179 5
  • Asinithistimorfi aubryae 64180 6
  • Asinithistimorfi aubryae 64181 7
  • Asinithistimorfi aubryae 64182 8
  • Asinithistimorfi aubryae 64183 9
  • Asinithistimorfi aubryae 64184 10
  • Asinithistimorfi aubryae 64185 11
  • Asinithistimorfi aubryae 64186 12
  • Asinithistimorfi aubryae 64187 13
  • Asinithistimorfi aubryae 64188 14
  • Asinithistimorfi aubryae 64189 15
  • Asinithistimorfi aubryae 64190 16
  • Asinithistimorfi aubryae 64191 17
  • Asinithistimorfi aubryae 64192 18
  • Asinithistimorfi aubryae 64193 19
  • Asinithistimorfi aubryae 64194 20
  • Asinithistimorfi aubryae 64195 21
  • Asinithistimorfi aubryae 64196 22
  • Asinithistimorfi aubryae 64197 23
  • Asinithistimorfi aubryae 64198 24
  • Asinithistimorfi aubryae 64199 25
  • Asinithistimorfi aubryae 64200 26
  • Asinithistimorfi aubryae 64201 27
  • Asinithistimorfi aubryae 64202 28
  • Asinithistimorfi aubryae 64203 29
  • Asinithistimorfi aubryae 64204 30
  • Asinithistimorfi aubryae 64205 31
  • Asinithistimorfi aubryae 64206 32
  • Asinithistimorfi aubryae 64207 33
  • Asinithistimorfi aubryae 64208 34
  • Asinithistimorfi aubryae 64209 35
  • Asinithistimorfi aubryae 64210 36
  • Asinithistimorfi aubryae 64211 37
    10µm
DSDP Leg 25, Site 245, Mozambique Channel (Davie Ridge), Indian Ocean
Final Epithet
Asinithistimorfi aubryae Bowman & Varol, 2021
Basionym

Asinithistimorfi paraxenos Bowman & Varol, 2021

Diagnosis

Elliptical heliolith possessing two non-birefringent discs and a moderate-high column that appears hollow and closed by a distal plug. The diameter of the median disc is greater than the diameter of the proximal disc.

Etymology

In honour of renowned nannofossil specialist Dr M.-P. Aubry, seasoned nannofossil taxonomist and biostratigrapher.

Dimensions Of Holotype

Overall height: 4.21μm, Overall length: 8.33μm, Overall width: 4.21μm; Column height:1.93μm, Column length: 6.27μm, Column width: 5.44μm.

Description

Moderately large (6.0-9.0 µm) and elliptical heliolith comprised two discs and a column. The discs are of unequal diameter (i.e. the median disc is wider than the proximal disc) and appear flat to very slightly convex (observed in side-view). The distal plug appears rough and distinct. The discs and narrow central opening are visible in plan view under phase-contrast and bright-field settings (Plate 2, Figs. 20 and 24 in Bowman & Varol, 2021). The column and plug artificially resemble an overgrown Dictyococcites bisectus under polarised light.

Optical Properties

In plan-view, the discs are non-birefringent, and the column is strongly birefringent. The entire species appears birefringent in the side-view. In cross-polarised light, the distal side shows a dextrogyre-type extinction pattern (e.g. Pl. 3, Figs. 10, 14 in Bowman & Varol, 2021). In contrast, the proximal side is characterised by a laevogyre-type extinction pattern (e.g. Pl. 3, Figs. 11, 15 in Bowman & Varol, 2021). When using the gypsum plate, with the species oriented in the north-south position, a distal view will show the blue regions corresponding to the horizontal axis. In contrast, a proximal view will show the blue sectors corresponding to the vertical axis.

Remarks

The elliptical shape and bizarre rough appearance of the column and plug (and unique form of species in general) are diagnostic identification features.

References

Bowman, A. R. & Varol, O. 2021. A Taxonomic Revision of Heliolithaceae - Applications in Resolving the Problematic Calcareous Nannofossil Biostratigraphy of the Paleocene. In: M. Montenary, M. (Ed.). Calcareous nannofossil biostratigraphy of the Stratigraphy and timescales. 6: 43-223.

Taxonomy
Asinithistimorfi
Uncategorised
Biostratigraphy
  • Phanerozoic
    • Cenozoic
      • Paleogene
        • Paleocene
          • Late Paleocene
            • Thanetian
          • Middle Paleocene
            • Selandian
Stratigraphic Range
Selandian - Thanetian
Age (Ma)
60.29 - 57.24
Holotype
Asinithistimorfi paraxenos 56871 Asinithistimorfi paraxenos 56871

Asinithistimorfi aubryae Bowman & Varol, 2021

Late Paleocene

DSDP Leg 36, Site 327A, The Maurice Ewing Bank, Falkland Plateau