pforams@mikrotax - Racemiguembelina fructicosa

Racemiguembelina fructicosa


Classification: pf_mesozoic -> Heterohelicidae -> Racemiguembelina -> Racemiguembelina fructicosa
Sister taxa: R. fructicosa, R. powelli, R. sp.

Taxonomy

Citation: Racemiguembelina fructicosa (Egger, 1900)
Rank: Species
Basionym: Guembelina fructicosa
Synonyms: Pseudotextularia varians mendezensis; Racemiguembelina pomeroli

Type images:

Original description: A cup-like distinguishes this species with tests of 0.20-0.50 mm which arise from a single, simple chamber or form a straightening spire. Juvenile tests differ from G. decurrens and similar forms by their increasing width as shown in Fig. 25, 26. Third chambers are inserted between the two alternating ones of the biserial row, and the chambers are positioned one upon the other in the whorls and with the insertion of more chambers at times distinctly widening. At the anterior, the juvenile tests show the last two chambers co bulging terminations of the test, with a broadly gaping opening in the border of the test axis. In the cross-section of the cone of the rounded off larger tests, the middle portion of the commonly damaged cone bottom remains recessed, and the chambers of the last whorl open freely with their borders into the depression of the test. All tests pore ribs which rise freely and are strongly constructed; because the chambers retain more or less the same size in the later whorls, the test surface resembles that of blackberries. Reuss shows a figure of Gaudryina siphonella Reuss from Hermsdorf in his study about the Fossil Foraminifera and Entomostraca of the region of Berlin in 1851, which may belong here.

Entries in the Catalog of original descriptions: Guembelina fructicosa, Pseudotextularia varians mendezensis, Racemiguembelina pomeroli


Emended description:


Morphology:

Wall type:

Size:

Character matrix
test outline:Subtriangularchamber arrangement:Multiserialedge view:Equally biconvexaperture:Multiple
sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:N/A
umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Coarsely costateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.0-10.0 N.B. These characters are used for advanced search. N/A - not applicable

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. fructicosa zone (69.18-70.14Ma, base in Maastrichtian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Egger, J. G. (1899). Foraminiferen und Ostrakoden aus den Kreidemergeln der Oberbayerischen Alpen. Abhandlugen der königlichen bayerischen Akademie Wissenschaften zu München, mathematische - naturwisenschaftliche Klasse. 21(1): +169-+. gs

Martin, S. E. (1972). Reexamination of the Upper Cretaceous planktonic foraminifera genera Planoglobulina and Ventilabrella Cushman. Journal of Foraminiferal Research. 2(2): 73-92. gs

Montanaro Gallitelli, E. (1957). A revision of the foraminiferal family Heterohelicidae. In: Studies in foraminifera; Part 1 - Planktonic foraminifera. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 133-154. gs V O

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


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Racemiguembelina fructicosa compiled by the pforams@mikrotax project team viewed: 28-9-2022

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