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.
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| | | Carlamuelleria karacuhae Varol 2023 | |
| | | Carlamuelleria katapliktikos Varol 2023 | |
| | | | Carlamuelleria tuezueniorum Varol 2023 |
Nannotax3 - ntax_Farinacci - Carlamuelleria.pdfCurrent identification:
Compiled data
Original Description
Description: Carlamuelleria is a coccolith with a non-birefringent lenticular distal shield made up of between 17 and 45 segments joined along most of their length. The tube cycle is often flush with the distal side of the shield. The combination of the tube cycle and the vestigial diminutive proximal shield create a brandy goblet-shaped structure in side view.
Extra details from original publication
Remarks: The presence of an elliptical tube cycle distinguishes subcircular Carlamuelleria karacuhae from other species of Carlamuelleria.
The number of segments in their distal shield distinguishes Carlamuelleria bramlettei (Carlamuelleria tuezueniorum (>23 segments). Fig. 5 shows the segments count in a mobile mount for Carlamuelleria bramlettei and Carlamuelleria tuezueniorum from DSDP Site 245A and Site 354.
In the mobile mount, in side view, Carlamuelleria and Davidbukrya are easily differentiated based on the presence of a proximal shield (e.g. Carlamuelleria has a vestigial proximal shield, and Davidbukrya lacks any proximal shield). The tube cycle and proximal shield create an X-shaped structure in Noelia and Senelia but create a brandy goblet-shaped structure in Carlamuelleria.
Mapping the optical properties of the proximal and distal sides enables Carlamuelleria to be distinguished from Davidbukrya, Noelia and Senelia in plan view. In cross-polarised light with a gypsum plate, the interference patterns of the tube cycle are aligned axially in Davidbukrya, Noelia and Senelia but diagonally in Carlamuelleria. Moreover, the blue sectors are aligned in the same direction on the tube cycle and the shield in Davidbukrya, but the blue sectors of the tube cycle and shield are aligned in opposite directions in Carlamuelleria.
In a mobile mount, in side view, Carlamuelleria and Markalius are easily differentiated, based on the characteristics of the proximal shield; Carlamuelleria has a vestigial proximal shield, and Markalius has a spaced proximal shield with an acute inclination angle.
Carlamuelleria can be distinguished from Markalius in plan view using optical properties. In cross-polarised light with a gypsum plate, the blue sectors are aligned in opposite directions in the tube cycle and shield in Carlamuelleria and Markalius. The interference patterns of the tube cycle are aligned axially in Markalius but diagonally in Carlamuelleria.
It is possible to obtain additional evidence when identifying Markalius in bright-field and phase-contrast illumination by detecting the proximal shield with careful focus (Plate 1, figs. 4,8,16,20).
Varol, O. (2023). New Paleocene calcareous nannofossils: Carlamuelleria, Davidbukrya, Mauriceblackia, Noelia and Senelia. Marine Micropaleontology. 180: 1-41. gsReferences:
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Carlamuelleria: Catalog entry compiled by <% compiler %>. Viewed: 19-9-2024
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