pforams@mikrotax - Hedbergella similis pforams@mikrotax - Hedbergella similis

Hedbergella similis


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella similis
Sister taxa: << < 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, H. ventriosa, H. sp.

Taxonomy

Citation: Hedbergella similis Longoria 1974
taxonomic rank: Species
Basionym: Hedbergella similis
Synonyms: Lilliputianella similis (Longoria) - Banner et al. 1993
Taxonomic discussion: This species displays a rather wide morphological variability mainly regarding the number of chambers (5 to 6) in the outer whorl and their elongation, especially of the last one. [copied from Chronos database]

Type images:

Original description: "Medium sized, test as with genus; formed by 2-3 whorls; peripheral margin elongate, strongly lobate; 5-6 chambers in the last whorl, increasing in size as added; chambers ovate to elongate on both spiral and umbilical sides, ovoid in peripheral view; sutures radial, slightly curved, depressed on both umbilical and spiral sides; umbilicus wide, shallow; relict apertures often observed on spiral side."

Entries in the Catalog of original descriptions: Hedbergella similis


Emended description:

Test medium sized, trochospirally coiled; 5 to 6 chambers in the outer whorl, increasing slowly and gradually in size as added; chambers initially globular to subglobular, the last two or, exceptionally, three tending to become slightly radially elongate, the final one may be more elongate in some specimens; chambers round at their end; spiral side low; peripheral outline ovoid, lobate; sutures straight to slightly curved on both spiral and umbilical sides; umbilicus rather wide and shallow; aperture as a low extraumbilical arch reaching the periphery. Wall smooth and finely perforate. [copied from Chronos database]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Planoconvexaperture:
sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5-6 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within G. algerianus zone (116.86-118.24Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of H. similis zone (0% up, 126Ma, in Barremian stage). Data source: zonal marker (from Timescale Creator)

Plot of range and occurrence data:

References:

Banner, F. T., Copestake, P. & White, M. R. (1993). Barremian-Aptian Praehedbergellidae of the North Sea area: a reconnaisance. Bulletin of the Natural History Museum, London (Geology). 49: 1-30. gs

Lipson-Benitah, S. & Almogi-Labin, A. (2004). Aptian planktonic foraminifera from Israel. Israel Journal of Earth Sciences. 53(1): 27-46. 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 similis compiled by the pforams@mikrotax project team viewed: 30-5-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110264 Go to Archive.is to create a permanent copy of this page - citation notes



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