Catalog - Globigerina neofalconensis

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Globigerina neofalconensis

Citation: Globigerina neofalconensis Fabbrini et al. 2023

Type specimens: Holotype NHMUK ZF 9958

Type sample (& lithostrat): Meteor M32/2MC6

Type age (chronostrat): Holocene (Zone PT1)

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.

Maximum diameter of the holotype: 340 μm

Named after its ancestor G. falconensis with the Greek prefix "neo" meaning "new"

1962 Globigerina falconensis; Parker, pl. 1, fig. 17–19.
1969 Globigerina falconensis forma atypica; Blow, p. 319.
1971 Globigerina falconensis; Brönniman & Resig, pl. 3, figs 6–7.
1971 Globigerina aff. G. falconensis; Brönniman & Reisig, fig. 9.
1971 Globigerina falconensis?; Brönniman & Resig, pl. 3, fig. 8.
1977 Globigerina falconensis; Malmgren & Kennett, pl. 1, figs 3, 5, 6.
1979 Globigerina falconensis; Iaccarino & Salvatorini, pl. 1, fig. 14.
1979 Globigerina falconensis; Thunnell et al. pl. 1, fig. 8.
1986 Globigerina falconensis; Jenkins et al. pl. 1, figs 5–6.
2007 Globigerina falconensis; Dowsett & Robinson pl. 1, fig. 7.
2008 Globigerina falconensis; Parcerisa et al., fig. 5d.
2010 Globigerina falconensis; Ovechkina et al., fig. 6A–C.
2017 Globigerina falconensis; Schiebel & Hemleben, pl. 2.4, figs 1–11.
2020 Globigerina falconensis; Lam & Leckie, pl. 3, figs 17–18.
? 1971 Globorotalia (Turborotalia) palpebra Brönniman & Resig, pl. 3, fig. 3.

This new species is named after its ancestor G. falconensis, to retain a well-established and widely used taxonomical name and concept. Globigerina neofalconensis can be distinguished from its ancestor G. falconensis by its more lobate profile and a more loosely coiled test, coupled with a wider umbilicus. Blow (1969) reported two different types of G. falconensis showing distinct stratigraphic ranges, named G. falconensis forma typica and G. falconensis forma atypica. The new species presented here matches with the latter, in terms of the overall morphology and stratigraphic range.

References:

Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. 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

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina neofalconensis Fabbrini et al. 2023

Globigerina neofalconensis

References:

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