pforams@mikrotax - Globigerinella radians pforams@mikrotax - Globigerinella radians

Globigerinella radians


Classification: pf_cenozoic -> Globigerinidae -> Globigerinella -> Globigerinella radians
Sister taxa: G. adamsi, G. calida, G. radians, G. siphonifera ⟩⟨ G. clavaticamerata, G. molinae, G. navazuelensis, G. obesa, G. praesiphonifera, G. pseudobesa, G. roeglina ⟩⟨ G. megaperta, G. wagneri, G. sp.

Taxonomy

Citation: Globigerinella radians (Egger 1893)
taxonomic rank: species
Basionym: Globigerina radians
Taxonomic discussion: Traditionally regarded as a variant within G. siphonifera, but shown by Weiner et al. (2015) to be a discrete species based on molecular genetic data and subtle but consistent morphological differences.

Catalog entries: Globigerina radians

Type images:

Distinguishing features:
Parent taxon (Globigerinella): Test initially trochospiral, becoming nearly planispiral; globular to ovate chambers; aperture umbilical; fine spines cover the test
This taxon: Near planispiral coiling & slightly radially elongate chambers

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Morphology:

Coiling direction (in extant population): mixed


Wall type:

Size:
>250µm

Character matrix
test outline:Stellatechamber arrangement:Pseudoplanispiraledge view:Equally biconvexaperture:Equatorial
sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:N/A
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Deepwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

In modern oceans a common, warm water, species [SCOR WG138]

Most likely ancestor: Globigerinella siphonifera - at confidence level 3 (out of 5). Data source: Weiner et al. 2015, f11.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (SCOR WG138)
First occurrence (base): within Tortonian Stage (7.25-11.62Ma, base in Tortonian stage). Data source: Weiner et al. 2015, prediction form molecular clock (so very large error margin)

Plot of occurrence data:

References:

Egger, J. G. (1893). Foraminiferen aus Meeresgrundproben, gelothet von 1874 bis 1876 von S. M. Sch. Gazelle. Abhandlungen der königlichen bayerischen Akademie Wissenschaften zu München. 18(2): 195-457. gs

Weiner, A. K. M., Weinkauf, M. F. G., Kurasawa, A., Darling, K. F. & Kucera, M. (2015). Genetic and morphometric evidence for parallel evolution of the Globigerinella calida morphotype. Marine Micropaleontology. 114: 19-35. gs


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Globigerinella radians compiled by the pforams@mikrotax project team viewed: 17-7-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=104047 Go to Archive.is to create a permanent copy of this page - citation notes



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