pforams@mikrotax - Planoheterohelix globulosa

Planoheterohelix globulosa


Classification: pf_mesozoic -> Heterohelicidae -> Planoheterohelix -> Planoheterohelix globulosa
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 globulosa (Ehrenberg, 1840)
Rank: Species
Basionym: Textularia globulosa
Synonyms:

Taxonomic discussion:
Illustration in E+M online catalogue not very good. Georgescu & Huber. 2009, p.87: ""Heterohelix" globulosa displays globular chambers overlapping at low rates, in contrast with any species of Planoheterohelix. This suggests that it is related to "H." reussi (Cushman, 1938)." [copied from Chronos database]

Type images:

Original description: Translation from Latin: Shell microscopic, surface smooth, longer than larger in the adult, chambers globular.

Entries in the Catalog of original descriptions: Textularia globulosa, Heterohelix striata aegyptiaca, Heterohelix (Pseudoguembelina) striata anfracta, Heterohelix fayose, Heterohelix ivandeklaszi, Heterohelix nkporoensis, Heterohelix orientalis, Heterohelix pseudoglobulosa, Heterohelix pseudoreussi, Guembelina globulosa striatula, Guembelina paucistriata, Guembelina ultimatumida, Guembelina ventilabrelliformis, Guembelina globocarinata, Textilaria globifera, Textilaria gracillima, Textularia decurrens, Textularia striata


Emended description: Georgescu & Huber. 2009, p.87: "Test is biserial throughout, with small proloculus (10-13 microns) followed by 11-16 globular, and gradually increasing in size chambers. Sutures are depressed and straight to slightly curved. Periphery is broadly rounded. Aperture is an interiomarginal, low- to medium-high arch, bordered by two small, symmetrically developed flanges. Chamber surface is ornamented with fine costae (2.2-3.5 microns). Test wall is calcareous, hyaline, and microperforate; pore diameter ranges 0.5-0.7 microns."
Haynes, 2015, p. 55: Test is moderate in size, ranging from 161 to 300 microns (n = 11) in length with 9 to 14 biserially arranged chambers. Proloculus is moderately sized, averaging 22 microns in diameter among the 10 specimens measured, with subsequent globular to subglobular chambers increasing slowly in size. In side view the test is subtriangular in outline and weakly tapered, and in edge view the test is slightly compressed. Sutures are straight to slightly curved, moderately depressed, and meet the central axis at an oblique angle. Aperture is a medium to low-arched, symmetrical semicircular arch formed at the base of the final chamber, and is commonly bordered by either symmetrical flanges or an apertural lip. Test wall is calcitic, hyaline, and ornamented with costae that are expressed variably in terms of continuity and thickness but are generally fine and continuous (average thickness = 2.6 microns, n = 6). Test wall is microperforate with an average pore diameter of 0.8 microns (n = 1). [copied from Chronos database]

Geological Range:
Last occurrence (top): within P. hariaensis zone (66.39-67.30Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-95.94Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix
test outline:Subtriangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Strongly depressedumb depth:N/Awall texture:Finely costateshell porosity:-
umbilical or test sutures:Strongly depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Ehrenberg, C. G. (1840). Uber die Bildung der Kreidenfelsen und des Kreidemergels durch unsichtbare Organismen. Physik. Abh. (1838), Berlin. 59-147. gs

Eicher, D. L. & Worstell, P. (1970). Lunatriella, a Cretaceous heterohelicid foraminifer from the western interior of the United States. Micropaleontology. 16(1): 117-121. gs

Georgescu, M. D. & Huber, B. T. (2009). Early evolution of the Cretaceous serial planktic foraminifera (late Albian-Cenomanian). Journal of Foraminiferal Research. 39: 335-360. gs

Georgescu, M. D. (1995). Upper Cretaceous Heterohelicidae in the Romanian Western Black Sea offshore. Revista Española de Micropaleontología. 27: 91-106. gs

Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs

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

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 V O


logo

Planoheterohelix globulosa compiled by the pforams@mikrotax project team viewed: 19-9-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=110401 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics