Nannotax3 - ntax_Farinacci

Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
Taxa are sorted alphabetically for simple browsing, or you can use search boxes at the top & bottom of the page

Type species: Noelia uenverdii Varol 2023

Type repository: not stated, presumalby the author's collection

Diagnosis: A circular to elliptical coccolith comprising a non-birefringent distal shield, an appressed proximal shield and a broad tube cycle that protrudes distally.

Description: The similar number of segments constructing the distal shield and the tube cycle varies from 24 to 50. The narrow appressed proximal is about half as wide as the distal shield. The narrowest point of the central area lies at the boundary between the tube cycle and the proximal shield and corresponds to the sharp tapering inner end of the shield. The combination of the tube cycle and the appressed proximal shield create an asymmetrical X-shape structure in the side view (Plate 10, Figs. 14,18; Plate 11, Figs. 2,6; Plate 12, Figs. 14, 18). The diameter of the broad tube cycle is about twice the width of the shield and always protrudes distally above the distal shield.

In honour of renowned nannofossil specialist Professor Dr. Denise Nöel, France.

Optical properties: In cross-polarised light, when using the gypsum plate, the blue sector corresponds to the horizontal axis on the distal side (Plate 11, Fig. 10). In contrast, the blue sector corresponds to the vertical axis on the proximal side (Plate 11, Fig. 12). Noelia displays dextrogyre extinction lines distally (Plate 13, Figs. 17–18) and laevogyre extinction lines proximally (Plate 13, Fig. 19–20).

Remarks: Noelia includes three new species, Noelia kolona, Noelia mahaniae and Noelia uenverdii. The subcircular shape and the elliptical central area of Noelia mahaniae distinguish it from Noelia kolona and Noelia uenverdii. The circular Noelia kolona and Noelia uenverdii differ by the presence or absence of a central opening. (i.e., Noelia kolona lacks a central opening, whereas Noelia uenverdii possesses a narrow central opening).

Noelia differs from Davidbukrya, Carlamuelleria, Markalius and Senelia by having a distinctly protruding tube cycle above the distal shield.

Noelia is further distinguished from Davidbukrya, Markalius and Carlamuelleria by having an appressed proximal shield. Davidbukrya has no shield, Carlamuelleria has a vestigial diminutive proximal shield, and Markalius has a spaced proximal shield with an acute inclination angle.

Noelia differs from Mauriceblackia and circular Coccolithus by having an appressed proximal shield. In Mauriceblackia and circular Coccolithus, the proximal shield is a spaced proximal shield. Because Noelia possesses a protruding tube cycle, it may be mistaken as Caycedoae Bowman and Varol (2021), but the latter has no proximal shield.

References:

Varol, O. (2023). New Paleocene calcareous nannofossils: Carlamuelleria, Davidbukrya, Mauriceblackia, Noelia and Senelia. Marine Micropaleontology. 180: 1-41. gs

CATALOG - Noelia

References:

Add Comment

Comments

				Noelia kolona Varol 2023
				Noelia mahaniae Varol 2023
				Noelia uenverdii Varol 2023