pforams@mikrotax - Rugoglobigerina milamensis pforams@mikrotax - Rugoglobigerina milamensis

Rugoglobigerina milamensis

Classification: pf_mesozoic -> Rugoglobigerinidae -> Rugoglobigerina -> Rugoglobigerina milamensis
Sister taxa: R. hexacamerata, R. macrocephala, R. milamensis, R. pennyi, R. rugosa, R. spinosa, R. sp.


Citation: Rugoglobigerina milamensis Smith&Pessagno 1973
taxonomic rank: Species
Basionym: Rugoglobigerina milamensis

Type images:

Original description: Test trochospiral, strongly spiroconvex, early whorls offset in a higher plane than ultimate whorl; peripheral margin subcircular, lobate; 5-6 chambers in the final whorl spherical to subspherical, in apertural and abapertural views slightly elongate axially, ultimate chamber slightly offset umbilically; initial chambers on spiral side increasing rapidly in size as added, chambers of final whorl increasing only slightly in size; sutures radial, curved, strongly, depressed; chambers of ultimate whorl heavily rugose, rugosities or costellae closely spaced, aligned in a meridional pattern, ultimate chamber generally more finely rugose; wall finely perforate; umbilicus large, subrectangular, deep; primary aperture interiomarginal, umbilical; spiral system of tegilla with intralaminal and infralaminal accessory apertures poorly preserved in specimens examined.

Entries in the Catalog of original descriptions: Rugoglobigerina milamensis

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:Umbilical
sp chamber shape:Globularcoiling axis:Highperiphery:N/Aaperture border:Tegilla
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Infralaminal
spiral sutures:Moderately depressedumb depth:Deepwall texture:Meridional costellaeshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5-6 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.64-69.27Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. fructicosa zone (69.27-70.14Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs O


Rugoglobigerina milamensis compiled by the pforams@mikrotax project team viewed: 26-5-2024

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