pforams@mikrotax - Heterohelicidae pforams@mikrotax - Heterohelicidae


Classification: pf_mesozoic -> Heterohelicidae
Sister taxa: Guembelitriidae ⟩⟨ Heterohelicidae ⟩⟨ Planomalinidae, Globigerinelloididae, Schackoinidae ⟩⟨ Conoglobigerinidae, Chilostomellidae, Favusellidae, Praehedbergellidae, Hedbergellidae, Rugoglobigerinidae, Rotaliporidae, Globotruncanidae, hidden
Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
planispiral -> biserial
Initially planispiral, final 1 or 2 pairs of chambers subtriangular with a short blunt spine.
Heterohelix americana
Heterohelix sp.

Initially planispiral then biserial, chambers globular, aperture symmetrical, wall texture costate
Spiroplecta americana
Spiroplecta sp.

biserial throughout
Biserial throughout, chambers globular, wall texture with irregular reticulate ornamentation
Braunella brauni
Braunella punctulata
Braunella sp.

Biserial throughout, test compressed with a carinate peripheral margin
Hendersonites carinatus
Hendersonites sp.

Biserial throughout, chambers with projections along the medial suture, like Pseudoguembelina, but without supplementary apertures, wall texture finely costate.
Huberella huberi
Huberella praehuberi
Huberella sp.

Biserial throughout, aperture symmetrically positioned, wall smooth, microperforate with irregularly scattered pustule or pore mounds
Laeviheterohelix dentata
Laeviheterohelix flabelliformis
Laeviheterohelix glabrans
Laeviheterohelix pulchra
Laeviheterohelix reniformis
Laeviheterohelix turgida
Laeviheterohelix sp.

Biserial throughout, aperture symmetrically positioned, wall texture costate.

Biserial throughout, aperture asymmetrically positioned, wall texture smooth.
Protoheterohelix obscura
Protoheterohelix washitensis
Protoheterohelix sp.

Biserial throughout, secondary sutural apertures along the median suture, partially covered by flaplike projections. Test usuually costate.
Pseudoguembelina costellifera
Pseudoguembelina costulata
Pseudoguembelina excolata
Pseudoguembelina hariaensis
Pseudoguembelina kempensis
Pseudoguembelina palpebra
Pseudoguembelina praehariaensis
Pseudoguembelina semicostata
Pseudoguembelina sp.

Adult biserial chambers expanded such that test breadth is greater than width in side view.
Pseudotextularia elegans
Pseudotextularia intermedia
Pseudotextularia nuttalli
Pseudotextularia sp.

biserial -> multiserial
Test flabelliform, biserial stage followed by a proliferation of chambers in the same plane. Medium to coarse costae.
Planoglobulina acervulinoides
Planoglobulina brazoensis
Planoglobulina browni
Planoglobulina carseyae
Planoglobulina manuelensis
Planoglobulina multicamerata
Planoglobulina riograndensis
Planoglobulina sp.

Similar to Planoglobulina but separate origin. Costae low and irregular.
Ventilabrella austinana
Ventilabrella eggeri
Ventilabrella ornatissima
Ventilabrella sp.

Test flabelliform, the 2 rows of chambers diverge leaving nonseptate central space that later is partially occupied by chamber proliferation.
Gublerina cuvillieri
Gublerina rajagopalani
Gublerina sp.

Similar to Gublerina but: 1. chamber sets increasing by one chamber at a time rather than three; 2. finer costae; 3. transverse biaperturate walls in multiserial part.
Praegublerina acuta
Praegublerina pseudotessera
Praegublerina robusta
Praegublerina sp.

Biserial or with chamber proliferation. Sutures rasied and beaded.
Sigalia carpatica
Sigalia decoratissima
Sigalia deflaensis
Sigalia rugocostata
Sigalia sp.

Test initially biserial, becomes conical with proliferation of multiple globular chambers forming a crown at top of test
Racemiguembelina fructicosa
Racemiguembelina powelli
Racemiguembelina sp.

biserial -> uniserial
Initially biserial, later chambers elongated and arranged in an irregular uniserial pattern
Lunatriella spinifera
Lunatriella sp.

Initially biserial, later part of test uniserial, globular chambers throughout.  
Rectoguembelina cretacea
Rectoguembelina sp.

Test biserial until final chamber, which becomes or shows a tendency to become uniserial
Zeauvigerina waiparaensis
Zeauvigerina sp.


Citation: Heterohelicidae Cushman 1927
taxonomic rank: Family

Original description: Test in the more primitive forms planospiral in the young,later becoming biserial, in the more specialized genera the spiral stage and even the biserial stage may be wanting and the rela-tionships shown by other characters; well calcareous, perforate, ornamentation in higher genera bilaterally symmetrical; aperture when simple, usually large for the size of the test, withoutteeth, in.some forms with apertural neck and phialine lip.

Entries in the Catalog of original descriptions: Heterohelicidae

Distinguishing features:
Parent taxon (pf_mesozoic):
This taxon: Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.

Geological Range:
Last occurrence (top): at top of Danian Stage (100% up, 61.6Ma, in Selandian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within P. ticinensis zone (101.92-103.94Ma, base in Albian stage). Data source: Total of ranges of species in this database

Plot of range and occurrence data:


Cushman, J. A. (1927a). An outline of a re-classification of the Foraminifera. Contributions from the Cushman Laboratory for Foraminiferal Research. 3: 1-105. gs O

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs


Heterohelicidae compiled by the pforams@mikrotax project team viewed: 17-7-2024

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