| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| | | Laeviella bentonensis | |
| | | Laeviella bollii | |
| | | Laeviella primuloides | |
| | | Laeviella tururensis | |
Taxonomy
The primary criterion for inclusion of La. primuloides, La. bentonensis, La. tururensis, and La. bollii in Laeviella is the presence of a smooth shell surface texture on all but the earliest final whorl chambers and a finely perforate wall ultrastructure. The oldest species of Laeviella, La. primuloides, is considered a direct descendent of Ticinella primula Luterbacher (text-fig. 2). Evidence for this transition is based on study of the Col de Palluel section (Vocontian Basin, SE France, Gale et al. 2011), which revealed that La. bentonensis (e.g., Pl. 2, Figs. 12, 13) occurs within the range of Ticinella primula (e.g., Pl. 5, Fig. 8), and its first occurrence is just above a morphotype that is intermediate between Ti. primula and La. bentonensis and is denoted as La. primuloides (Pl. 5, Fig. 9). Similar to Ti. primula, La. primuloides has a deeply pitted, irregularly rugose (ticinellid) wall surface texture on the first chambers of the final whorl, but its planispiral coiling mode and smooth wall texture on the last chambers of the final whorl (e.g., Pl. 2, Figs. 1c, 2b, 3c, 4c, 5b, 6b, 7b), justify its inclusion in Laeviella.
Entries in the Catalog of original descriptions: Laeviella
Distinguishing features:
Parent taxon (Globigerinelloididae): Test planispiral, chambers globular to radially elongate; aperture at the base of the chamber face and equatorial in position, lateral portions of primary aperture may remain open as new chambers are added, forming relict openings around the umbilical region.
This taxon: Planispiral, wall texture smooth except sometimes pustulose early chambers, weakly lobate with 6-9 chambers in final whorl.
Morphology:
Wall type:
Size:
Character matrix
| test outline: | Subcircular | chamber arrangement: | Planispiral | edge view: | - | aperture: | Interiomarginal |
| sp chamber shape: | - | coiling axis: | - | periphery: | - | aperture border: | Thin lip |
| umb chbr shape: | - | umbilicus: | - | periph margin shape: | - | accessory apertures: | None |
| spiral sutures: | - | umb depth: | - | wall texture: | Smooth | shell porosity: | - |
| umbilical or test sutures: | Weakly depressed | final-whorl chambers: | 6-9 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Most likely ancestor: Ticinella - at confidence level 0 (out of 5). Data source: Huber et al 2022 fig. 2.
Geological Range:
Last occurrence (top): at top of G. aegyptiaca zone (100% up, 73.8Ma, in Campanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within T. primula zone (107.39-111.84Ma, base in Albian stage). Data source: Total of ranges of species in this database
Plot of range and occurrence data:
Huber, B. T., Petrizzo, M. M. & Falzoni, F. (2022b). Taxonomy and phylogeny of Albian–Maastrichtian planispiral planktonic foraminifera traditionally assigned to Globigerinelloides. Micropaleontology. 68(2): 117-183. gsReferences:
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Laeviella compiled by the pforams@mikrotax project team viewed: 13-10-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110597 Go to Archive.is to create a permanent copy of this page - citation notes |
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