Original description: Test the smallest of all representatives of Globigerinella known to date. It is flat, rounded, and bilaterally symmetrical, but not involute. There are two whorls. Diameter of the first whorl disproportionately small in comparison with the diameter of the second whorl. In specimens with both sides well preserved, the chambers of the first whorl are visible in the median, depressed portion. Peripheral border rounded, lobate. Chambers almost spherical, slightly compressed laterally, very imperceptibly differing in size from one another. In the final whorl there are six to eight chambers. Sutures simple, weakly curved, almost straight, depressed. Aperture typical of the genus. Wall smooth.
Emended description: Test the smallest of all representatives of Globigerinella known to date. It is flat, rounded, and bilaterally symmetrical-, but not involute. There are two whorls. Diameter of the first whorl disproportionately small in comparison with the diameter of the second whorl. In specimens with both sides well preserved, the chambers of the first whorl are visible in the median, depressed portion. Peripheral border rounded, lobate. Chambers almost spherical, slightly compressed laterally, very imperceptibly differing in size from one another. In the final whorl there are six to eight chambers. Sutures simple, weakly curved, almost straight, depressed. Aperture typical of the genus. Wall smooth. [copied from Chronos database]
Character matrix
test outline:
Circular
chamber arrangement:
Planispiral
edge view:
Hourglass
aperture:
Equatorial
sp chamber shape:
Inflated
coiling axis:
N/A
periphery:
N/A
aperture border:
Thin lip
umb chbr shape:
Inflated
umbilicus:
Wide
periph margin shape:
Narrowly rounded
accessory apertures:
None
spiral sutures:
Moderately depressed
umb depth:
Shallow
wall texture:
Finely pustulose
shell porosity:
Finely Perforate: 1-2.5µm
umbilical or test sutures:
Moderately depressed
final-whorl chambers:
6-8
N.B. These characters are used for advanced search. N/A - not applicable
Geological Range: Last occurrence (top): within C. plummerae zone (75.91-79.33Ma, top in Campanian stage). Data source: Huber et al 2022 First occurrence (base): within P. appenninica zone (100.50-101.92Ma, base in Albian stage). Data source: Huber et al 2022
Plot of range and occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs
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. gs
Subbotina, N. N. (1949). Микрофауна меловых отложений южного склона Кавказа [Microfauna from the Cretaceous of the southern slope of the Caucasus]. Trudy VNIGRI Mikrofauna USSR. 34: 5-36. gs
Missing or ambiguous references: ;
Planohedbergella ultramicra compiled by the pforams@mikrotax project teamviewed: 11-9-2024
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