pforams@mikrotax - Planoheterohelix rumseyensis pforams@mikrotax - Planoheterohelix rumseyensis

Planoheterohelix rumseyensis

Classification: pf_mesozoic -> Heterohelicidae -> Planoheterohelix -> Planoheterohelix rumseyensis
Sister taxa: P. globulosa, P. moremani, P. olssoni, P. papula, P. paraglobulosa, P. planata, P. postmoremani, P. praenuttallii, P. reussi, P. rumseyensis ⟩⟨ P. labellosa, P. sphenoides, P. stenopos, P. vistulaensis, P. sp.


Citation: Planoheterohelix rumseyensis (Douglas 1969)
Rank: Species
Basionym: Heterohelix rumseyensis Douglas 1969

Type images:

Original description: Test large, biserial, rapidly tapering in early portion, gently tapering to straight-sided in adult; periphery lobate throughout. Chambers subglobular, wider than high, inflated in early portion; later pairs quadrate. Sutures depressed, distinct, straight. Wall calcareous, perforate; surface costate to smooth; costae fine, longitudinal. Aperture a low arch on inner margin of last chamber, with apertural flaps along outside of arch; flaps of previous chambers observable along medial suture of last pair of chambers.

Entries in the Catalog of original descriptions: Heterohelix rumseyensis

Character matrix
test outline:Elongatechamber arrangement:Envelopingedge view:Compressedaperture:Interiomarginal
sp chamber shape:Subrectangularcoiling axis:N/Aperiphery:N/Aaperture border:Thick flange
umb chbr shape:Subrectangularumbilicus:N/Aperiph margin shape:Narrowly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Smoothshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:0.0-0.0 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within Globotruncanella havanensis zone (74.00-75.71Ma, top in Campanian stage). Data source:
First occurrence (base): within Globotruncanita elevata zone (79.20-84.19Ma, base in Santonian stage). Data source:

Plot of range and occurrence data:


Douglas, R. G. (1969). Upper Cretaceous planktonic foraminifera in northern California. Part 1 - Systematics. Micropaleontology. 15(2): 151-209. gs


Planoheterohelix rumseyensis compiled by the pforams@mikrotax project team viewed: 20-3-2023

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AphiaID: 1320479 Nomenclatural data on WoRMS
Short stable page link: Go to to create a permanent copy of this page - citation notes

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