pforams@mikrotax - Planoheterohelix rumseyensis

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.

Taxonomy

Citation: Planoheterohelix rumseyensis (Douglas 1969)

Rank: Species

Basionym: Heterohelix rumseyensis Douglas 1969

Type images:

holotype: H. rumseyensis
holotype: H. rumseyensis

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: Elongate chamber arrangement: Enveloping edge view: Compressed aperture: Interiomarginal
sp chamber shape: Subrectangular coiling axis: N/A periphery: N/A aperture border: Thick flange
umb chbr shape: Subrectangular umbilicus: N/A periph margin shape: Narrowly rounded accessory apertures: None
spiral sutures: Moderately depressed umb depth: N/A wall texture: Smooth shell porosity:
umbilical or test sutures: Moderately depressed final-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:

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
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Planoheterohelix

References:

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

Taxon Search:

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AphiaID: 1320479 Nomenclatural data on WoRMS
Short stable page link: https://mikrotax.org/pforams/index.php?id=110410 Go to Archive.is to create a permanent copy of this page - citation notes

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test outline:	Elongate	chamber arrangement:	Enveloping	edge view:	Compressed	aperture:	Interiomarginal
sp chamber shape:	Subrectangular	coiling axis:	N/A	periphery:	N/A	aperture border:	Thick flange
umb chbr shape:	Subrectangular	umbilicus:	N/A	periph margin shape:	Narrowly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	N/A	wall texture:	Smooth	shell porosity:
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	0.0-0.0	N.B. These characters are used for advanced search. N/A - not applicable