Watznaueria cf.coronata
Set number: 3233
-
1
-
2
-
3
-
4
10µm
Set number: 3238
-
1
-
2
-
3
-
4
10µm
Watznaueria cf. coronata (Gartner, 1968) Bukry, 1969
Elliptical species of Watznaueria are characterised by single-tiered distal and proximal shields, narrow tube cycles, and a broad, elongate central opening devoid of central-area structures. The central opening exceeds 1.5 μm in width and has an ellipticity greater than 1.5.
Under cross-polarised light in plan view, the shields and tube cycles exhibit white interference colours, inclined extinction lines, and length-fast (–) elongation. Extinction angles measured on the distal side are approximately 75° in the shields and 71° in the tube cycles. The locking cycle remains in constant extinction, forming a narrow dim suture between the shield and tube cycle.
Bukry, D. 1969. Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles 51 (Protista 2): 1-79.
Gartner, S., 1968. Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. University of Kansas Paleontological Contributions, Articles 48 (Protista 1), 1-56.