Lam & Leckie 2020 pl03 17-18.jpg
Lam & Leckie 2020 pl03 17-18.jpg
Catalog entries: Globigerina neofalconensis, Globorotalia (Turborotalia) palpebra
Type images:
holotype: G. neofalconensis
holotype: G. neofalconensis
paratype: G. neofalconensis
paratype: G. neofalconensis
paratype: G. neofalconensisDistinguishing features:
Parent taxon (Globigerina): Low trochospirally enrolled, globose test; 3-5, globular chambers in final whorl. Aperture interiomarginal, umbilical, a high arch bordered by a thin rim-like lip or thick imperforate lip. Wall spinose; spines supported by spine collars which coalesce to form ridges.
This taxon: Globigerina neofalconensis can be distinguished from its ancestor G. falconensis by its more lobate profile,more loosely coiled test and the wider umbilicus.
Type of wall: Spinose, pseudocancellate and bulloides-type wall texture. The final chamber tends to be smoother with visibly variable pore size. The penultimate chamber is commonly pseudocancellate, the third ultimate can instead present a Globigerina-type wall. Sometimes specimens with completely pseudocancellate wall occur, showing that the ontogenetic pattern is inconstant. Test morphology: Test loosely coiled constituted by four subspherical slowly increasing chambers in the final whorl. The outline is lobate. A total of 10–12 chambers are arranged in 2–2.5 whorls, with random coiling direction. In umbilical view, the last whorl consists of subspherical chambers loosely coiled and separated by straight and incised sutures. The shape of the last chamber is quite variable, sometimes developing an elongated bulb-like shape, though kummerforms are very common. Umbilicus deep and open, a low umbilical aperture bordered with an evident imperforate lip. The aperture can create a curved shape of the lip. In spiral view, four subspherical chambers divided by straight incised sutures, all the chambers from the previous whorls are visible in the spire. In edge view, low trochospire and flat spiral side with the last chamber sometimes slightly tilted towards the umbilicus, margin rounded.
Diagnostic characters:
Morphology:
Wall type:
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | - | aperture: | Umbilical |
| sp chamber shape: | Globular | coiling axis: | Low-moderate | periphery: | - | aperture border: | Thick lip |
| umb chbr shape: | Globular | umbilicus: | N/A | periph margin shape: | - | accessory apertures: | None |
| spiral sutures: | Strongly depressed | umb depth: | N/A | wall texture: | Spinose | shell porosity: | Macroperforate: >2.5µm |
| umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 4-0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Phylogenetic relations
Most likely ancestor: Globigerina falconensis - at confidence level 5 (out of 5). Data source: Fabbrini et al., 2023.
Geological Range:
Last occurrence (top): Non-extinct palaeontological taxon. Data source: Fabbrini et al., 2023
First occurrence (base): within M13 zone (6.14-9.83Ma, base in Tortonian stage). Data source: Fabbrini et al., 2023
Plot of occurrence data:
Primary source for this page: Fabbrini et al., 2023
Brummer, G-J. A. & Kucera, M. (2022). Taxonomic review of living planktonic foraminifera. Journal of Micropalaeontology. 41: 29-74. gs Fabbrini, A., Greco, M., Iacoviello, F., Kucera, M., Ezard, T. H. G. & Wade, B. S. (2023). Bridging the extant and fossil record of planktonic foraminifera: implications for the Globigerina lineage. Palaeontology. 1-18. gs Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. gsReferences:
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Globigerina neofalconensis compiled by the pforams@mikrotax project team viewed: 16-11-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=104419 Go to Archive.is to create a permanent copy of this page - citation notes |