pforams@mikrotax - Hedbergella infracretacea pforams@mikrotax - Hedbergella infracretacea

Hedbergella infracretacea


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella infracretacea
Sister taxa: H. aptiana, H. bizonae, 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. occulta, H. praelippa, H. praetrocoidea, H. primare, H. quadricamerata, H. roblesae, H. ruka, H. semielongata, H. sigali> >>

Taxonomy

Citation: Hedbergella infracretacea (Glaessner, 1937)
taxonomic rank: Species
Basionym: Globigerina infracretacea
Synonyms:
Taxonomic discussion: The name Globigerina infracretacea subsp. gargasiana Moullade, 1961 was proposed to avoid a homonym, but this is superfluous if trochoidea is placed in Hebdbergella instead of Globigerina

Type images:

Original description: Das sehr kleine Gehäuse besteht aus 15-16 Kammern von denen 5-6. den letzen Umgang bilden. Es ist flch trochospiral gebaut: die Kammern sind gewolbt und deutlich getrennt, sie vergrössern sich sehr allmählich. Der Nabel ist offen, aber klein. Die Apertur ist nicht gegen den Nabel gerichtet, sondern liegt in der Windungsrichtung an der Basis der letzten Kammer.

[The very small test consists of 15 to 16 chambers of which 5 to 6 form the last volution. It is flat-trochospiral, chambers are arched and distinctly separated, and enlarge only very gradually. Umbilicus is open but small. Aperture is not directed towards umbilicus, but is located at the base of the last chamber and within direction of the coil. - Translation from Chornos website]

Entries in the Catalog of original descriptions: Globigerina infracretacea, Globigerina infracretacea trochoidea, Globigerina infracretacea gargasiana, Globigerina aptica, Hedbergella beegumensis


Emended description:

Test medium sized, coiled in a flat to slightly convex trochospire; 2 to 2.5 whorls; 5 to 5.5 (rarely 4.5) globular to subglobular chambers in the outer whorl, increasing gradually and slowly in size as added; equatorial periphery subcircular to slightly ovoid, slightly to moderately lobate; sutures depressed, radial mainly straight; umbilical area rather small and shallow; aperture as a low to medium arch bordered by a lip. Wall finely perforate, smooth or with the first chambers of the last whorl covered by perforation cones. [Huber & Leckie,2011, p. 67]: Emended description. Test wall relatively thick (4 to 6 mm), finely perforate, most chambers in the final whorl are densely covered by perforation cones that may coalesce (e.g., Fig. 5.9b), and internal chamber wall may also show slightly raised cones surrounding each pore (Fig. 4a). Test medium sized, coiled in a nearly flat to slightly convex trochospire with 2 to 2.5 whorls; 5 to 6 (rarely 4.5) globular to subglobular chambers in the final whorl, increasing gradually in size, never radially elongate, last chamber often kummerform; equatorial periphery subcircular to slightly ovoid, slightly to moderately lobate; sutures depressed, radial, mainly straight; umbilical area rather narrow and deep; aperture a low to medium umbilicalextraumbilical arch with a thin imperforate rim, but never bordered by a lip or other periapertural structures. [copied from Chronos database]

Character matrix
test outline:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Extraumbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Perforation conesshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within P. rohri zone (113.22-116.60Ma, top in Aptian stage). Data source: copied from Chronos database, but zonal name updated from T. bejaouaensis to T. rohri
First occurrence (base): within L. cabri zone (119.05-120.55Ma, base in Aptian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Agalarova, D. A. (1951). Studies of microfauna from Cretaceous deposits of Azerbaydzhan. Aznefteizdat, Baku. 1-128. gs

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

Glaessner, M. F. (1937a). Planktonforaminiferen aus der Kreide und dem Eozän und ihre stratigraphische Bedeutung. Etyudy po Mikropaleontologiy, Paleontologicheskaya Laboratoriya Moskovskogo Gosudarstvennogo Universiteta. 1(1): 27-46. gs

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

Moullade, M. (1960). Sur quelques Foraminiferes du Cretace inferieur des Baronnies (Drome). Revue de Micropaléontologie. 3(2): +136+-. gs

Moullade, M. (1961). Quelques foraminifères et ostracodes nouveaux du Crétacé inférieur Vocontien. Revue de Micropaléontologie. 3(4): 213-216. gs

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Hedbergella infracretacea compiled by the pforams@mikrotax project team viewed: 11-9-2024

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Comments (4)

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Le Coze

You have also in the synonymy :

Globigerina infracretacea subsp. gargasiana Moullade, 1961 an unnecessary nomen novum of Globigerina infracretacea subsp. trochoidea Moullade, 1960

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Jeremy Young(UK)

why was it a superfluous name?

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Le Coze

Moullade was considering the genus Hedbergella as useless. If it had been confirmed his subsp. would have been a junior homonym of Hedbergella trochoidea (Gandolfi)= Anomalina lorneiana (d'Orb.) trocoidea Gandolfi, 1942

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Jeremy Young(UK)

this is quite complex, I think I have explained it, but I will ask Brain to take a look