pforams@mikrotax - Schackoina cenomana pforams@mikrotax - Schackoina cenomana

Schackoina cenomana

Classification: pf_mesozoic -> Schackoinidae -> Schackoina -> Schackoina cenomana
Sister taxa: S. bicornis, S. cenomana, S. multispinata, S. sp.


Citation: Schackoina cenomana (Schacko, 1897)
Rank: Species
Basionym: Siderolina cenomana

Type images:

Original description: I have found so far this extremely small Globigerina-like form only in the Cenomanian of Moltzow and the Cretaceous of the borehole Hirschgarten close to Kopenik-Berlin at a depth of 318 meters. The test is built up of eight chambers in 1½ whorls. Embryonic chamber is spherical, as are the next two following chambers. The fourth chamber is totally different in appearance and forms an elongate, pauch-like, slightly compressed funnel-shaped with a radial, long, outward oriented tubular opening; there must be a second connecting opening with the equally pauch-like fifth and also the round third chamber which, however, cannot be clearly seen because of the strong calcification of the small object. Chambers six and seven are similar in shape, but the eight chamber has spherical to irregular bubble-like shape, without a tubular structure to the outside, and it is distinctly drawn with its other opening towards the lower part of the seventh chamber, which, however, covers it in part. The tupe openings of the chambers have different diameters and length, and are either incompletely developed or broken off in part. The length of the large chambers too cannot be determined, for they seem be unify in a common, hollow space. The pauch-like chambers do also not increase always and proportionally in diameter and length. The specimen figured by Moltzow (Fig. IV) lacks the fourth pauch-like chamber. In Fig. V, the communication-connections of all chambers appear so enlarged, that the slightly compressed, funnel-like chambers form possibly only a coherent hollow space and the eigth chamber is here relatively small developed. The perforation is distinctly minute and somewhat more visible on the last chamber.

Entries in the Catalog of original descriptions: Siderolina cenomana, Schackoina gandolfii, Schackoina cenomana masellae, Hastigerinella (Hastigerinoides) rohri, Schackoina sellaeforma, Schackoina tappanae

Character matrix
test outline:Stellatechamber arrangement:Pseudoplanispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Elongatecoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Elongateumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:Relict
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within G. elevata zone (79.20-84.19Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within P. appenninica zone (100.50-101.92Ma, base in Albian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs

Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs

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

Schacko, G. (1897). Beitrag uber Foraminiferen aus der Cenoman-Kreide von Moltzow in Mecklenburg. Archiv des Vereins der Freunde der Naturgeschichte in Mecklenburg. 50: 161-168. gs


Schackoina cenomana compiled by the pforams@mikrotax project team viewed: 1-6-2023

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