pforams@mikrotax - Hedbergella occulta pforams@mikrotax - Hedbergella occulta

Hedbergella occulta


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella occulta
Sister taxa: << < H. bollii, H. compacta, H. excelsa, H. gorbachikae, H. handousi, H. hexacamerata, H. hispaniae, H. infracretacea, H. kuhryi, H. kuznetsovae, H. labocaensis, H. luterbacheri, H. maslakovae, H. mitra, H. modesta, H. occulta, H. praelippa, H. praetrocoidea, H. primare, H. quadricamerata, H. roblesae, H. ruka, H. semielongata, H. sigali, H. similis, H. speetonensis, H. tardita, H. tatianae, H. trocoidea, H. tunisiensis, H. tuschepsensis> >>

Taxonomy

Citation: Hedbergella occulta Longoria 1974
taxonomic rank: Species
Basionym: Hedbergella occulta
Synonyms: Blefuscuiana globigerinelloides lobulata; Blefuscuiana multicamerata; Blefuscuiana occulta quinquecamerata

Type images:

Original description: Test large, coiled in a low to medium high trochospire consisting of 3 whorls; peripheral margin circular, lobate; 6-7 chambers in the last whorl, increasing gradually in size as added; chambers globular, somewhat ovoid on both spiral and umbilical sides; chambers on umbilical side separated by deeply incised sutures; spherical in peripheral view; sutures radial, slightly curved on both spiral and umbilical sides; primary apertures extraumbilical-spiroumbilical bordered by an imperforate flap; umbilicus circular, deep.

Entries in the Catalog of original descriptions: Hedbergella occulta, Blefuscuiana globigerinellinoides lobulata, Blefuscuiana multicamerata, Blefuscuiana occulta quinquecamerata


Emended description:

Test medium sized, coiled in a low trochospire; 2 to 2.5 whorls; 6 to 6.5 chambers in the outer whorl increasing rather gradually and slowly in size as added; chambers globular to subglobular, inflated the last two or three tending to become subtriangualr on the umbilical side, subtrapezoidal on the spiral side, slightly reniform in lateral view; equatorial periphery subcircular to ovoid, slightly lobate; sutures depressed, radial to slightly curved; umbilical area small and rather deep; aperture as a low to medium arch bordered by a lip. Wall smooth, finely perforate, that may be covered by perforation cones in the early chambers of the last whorl. [Huber & Leckie, 2011, p. 70]: Emended description. Test wall finely perforate, surface sometimes smooth, but usually covered by perforation cones except for the final chamber, which is usually smooth. Test is medium in size, coiled in a low trochospire with 2 to 2.5 whorls; equatorial periphery subcircular to ovoid, slightly lobate; chambers increasing gradually in size with 6 to 6.5 in the outer whorl, globular until the last one or two chambers, which become subtriangular on the umbilical side; final chamber may be kummerform or aborted; sutures depressed, radial to slightly curved; umbilical area moderately narrow and deep; aperture a low to medium arch bordered by a narrow to thick lip. [copied from Chronos database]

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:-
sp chamber shape:Inflatedcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:Deepwall texture:Perforation conesshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6-6.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within T. rohri (-Ma, top in "Holocene" stage). Data source: copied from Chronos database, but zonal name updated from T. bejaouaensis to T. rohri
First occurrence (base): within G. blowi zone (120.55-124.40Ma, base in Barremian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gs

Longoria, J. F. (1974). Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera. Revista Española de Micropaleontología. Numero Extraordinario: 5-107. gs


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Hedbergella occulta compiled by the pforams@mikrotax project team viewed: 30-5-2024

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