pforams@mikrotax - Laeviella bollii pforams@mikrotax - Laeviella bollii

Laeviella bollii


Classification: pf_mesozoic -> Globigerinelloididae -> Laeviella -> Laeviella bollii
Sister taxa: L. bentonensis, L. bollii, L. primuloides, L. tururensis

Taxonomy

Citation: Laeviella bollii (Pessagno 1967)
taxonomic rank: species
Basionym: Globigerinelloides bollii Pessagno 1967
Taxonomic discussion: Early chambers spherical while late chambers are ovoid, chambers increase only gradually in size, shallow rather than deep umbilici, more arched primary aperture and smaller than G. prairiehillensis, surface smooth, polished, and finely perforate, never spinose/papilose. [copied from Chronos database]

Transferred to Laeviella by Huber et al. 2022

Type images:

Original description: Test planispiral, lobate, biumbilicate with 6-7 somewhat compressed chambers in the last whorl. Chambers of earlier whorls spherical; chambers of last whorl ovoidal, expanding gradually in size. Test surface smooth, polished, and finely perforate; never spinose or papillose. Sutures straight, radial, and somewhat depressed. Umbilici large and shallow. Primary aperture equatorial in position; a moderately high arch at the base of the last chamber, leading into both umbilical areas. Relict apertures well developed near the suture junctions to umbilicus; covered by flaplike structures. Outer wall structures radial hyaline perforate. Relict apertural flaps and septal walls microgranular hyaline.

Entries in the Catalog of original descriptions: Globigerinelloides bollii


Size:
Diameter Holotype #689272: 0.256 mm; Paratype #689271A: 0.242 mm; Paratype #689271B: 267 mm

Character matrix
test outline:Circularchamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:N/Aumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6-7 N.B. These characters are used for advanced search. N/A - not applicable

Most likely ancestor: Laeviella bentonensis - at confidence level 2 (out of 5). Data source: Huber et al. 2022.

Geological Range:
Last occurrence (top): within G. havanensis zone (74.00-75.71Ma, top in Campanian stage). Data source: Huber et al. 2022
First occurrence (base): within R. cushmani zone (94.03-98.69Ma, base in Cenomanian stage). Data source: Huber et al. 2022

Plot of range and occurrence data:

References:

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

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O

Missing or ambiguous references: ;


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Laeviella bollii compiled by the pforams@mikrotax project team viewed: 23-4-2024

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