Foraminifera taxon details
Rectocribranopsis Vachard & Kobayashi in Kobayashi & Vachard, 2022 †
1656514 (urn:lsid:marinespecies.org:taxname:1656514)
accepted
Genus
marine, brackish, fresh, terrestrial
fossil only
feminine
Kobayashi, F.; Vachard, D. (2022). Carboniferous foraminifers and biostratigraphy of lower Akiyoshi Limestone (Japan). <em>Revue de Paléobiologie.</em> 41(2): 99-239., available online at https://doi.org/10.5281/zenodo.6858352
page(s): p. 145 [details] Available for editors
[request]
page(s): p. 145 [details] Available for editors
[request]
Original description Diagnosis: Test elongate, up to 1.10 mm; almost planispirally coiled at the beginning (despite a small deviation between...
Original description Diagnosis: Test elongate, up to 1.10 mm; almost planispirally coiled at the beginning (despite a small deviation between the first and second whorl); uncoiled and rectilinear at the end of the growth (Pl. X, figs 25- 31). The initial coiled part is discoid in axial section (Pl. X, figs 23, 24, 32). Coiling low at the origin with tighter chambers (Pl. X, figs 25, 31, 33-35). Second and third whorl higher, with thicker septa, more irregularly arranged and with variable inclination (Pl. X, figs 33-35). Aperture basal in the coiled part, becoming areal and cribrate in the terminal uncoiled part (Pl. X, figs 25, 29, 31, 35). Wall thick, coarsely granular, agglutinated with numerous clear particles (Pl. X, figs 25, 28-30, 35).
Comparison: The new genus differs from Cribranopsis Conil & Longerstaey in Conil et al., 1980, by the uncoiled terminal stage, more irregular and longer septa in coiled part, thinner wall, smaller size, and the difference of age: middle Visean against early Serpukhovian, and also by its long uncoiled terminal stage. It differs from Granuliferelloides McKay & Green, 1963 by a longer initial part, more chambers, subquadrate and not guttiform (drop-shaped) in shape, cribrate apertures in the uncoiled part, more complete septa, and the difference of ages: late Visean versus Tournaisian; from Rhodesinella Conil & Longerstaey in Conil et al., 1980, by a longer uncoiled part, and the shapes of tests and septa. This new genus is differentiated from Corrigotubella Ganelina, 1966 by its reduced coiled initial part with less endothyrid chambers, and cribrate apertures; and from Rectogranuliferella Conil & Lys in Mansy et al., 1989 by the absence of biseriate stage.
Occurrence: Biozones 2 (Mikhailovian) and 3 (Venevian) of Akiyoshi area.
(Kobayashi and Vachard (2022)). [details]
Comparison: The new genus differs from Cribranopsis Conil & Longerstaey in Conil et al., 1980, by the uncoiled terminal stage, more irregular and longer septa in coiled part, thinner wall, smaller size, and the difference of age: middle Visean against early Serpukhovian, and also by its long uncoiled terminal stage. It differs from Granuliferelloides McKay & Green, 1963 by a longer initial part, more chambers, subquadrate and not guttiform (drop-shaped) in shape, cribrate apertures in the uncoiled part, more complete septa, and the difference of ages: late Visean versus Tournaisian; from Rhodesinella Conil & Longerstaey in Conil et al., 1980, by a longer uncoiled part, and the shapes of tests and septa. This new genus is differentiated from Corrigotubella Ganelina, 1966 by its reduced coiled initial part with less endothyrid chambers, and cribrate apertures; and from Rectogranuliferella Conil & Lys in Mansy et al., 1989 by the absence of biseriate stage.
Occurrence: Biozones 2 (Mikhailovian) and 3 (Venevian) of Akiyoshi area.
(Kobayashi and Vachard (2022)). [details]
Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2025). World Foraminifera Database. Rectocribranopsis Vachard & Kobayashi in Kobayashi & Vachard, 2022 †. Accessed at: https://www.marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=1656514 on 2026-05-11
Date
action
by
original description
Kobayashi, F.; Vachard, D. (2022). Carboniferous foraminifers and biostratigraphy of lower Akiyoshi Limestone (Japan). <em>Revue de Paléobiologie.</em> 41(2): 99-239., available online at https://doi.org/10.5281/zenodo.6858352
page(s): p. 145 [details] Available for editors [request]
page(s): p. 145 [details] Available for editors
[request]From editor or global species database
Original description Diagnosis: Test elongate, up to 1.10 mm; almost planispirally coiled at the beginning (despite a small deviation between the first and second whorl); uncoiled and rectilinear at the end of the growth (Pl. X, figs 25- 31). The initial coiled part is discoid in axial section (Pl. X, figs 23, 24, 32). Coiling low at the origin with tighter chambers (Pl. X, figs 25, 31, 33-35). Second and third whorl higher, with thicker septa, more irregularly arranged and with variable inclination (Pl. X, figs 33-35). Aperture basal in the coiled part, becoming areal and cribrate in the terminal uncoiled part (Pl. X, figs 25, 29, 31, 35). Wall thick, coarsely granular, agglutinated with numerous clear particles (Pl. X, figs 25, 28-30, 35). Comparison: The new genus differs from Cribranopsis Conil & Longerstaey in Conil et al., 1980, by the uncoiled terminal stage, more irregular and longer septa in coiled part, thinner wall, smaller size, and the difference of age: middle Visean against early Serpukhovian, and also by its long uncoiled terminal stage. It differs from Granuliferelloides McKay & Green, 1963 by a longer initial part, more chambers, subquadrate and not guttiform (drop-shaped) in shape, cribrate apertures in the uncoiled part, more complete septa, and the difference of ages: late Visean versus Tournaisian; from Rhodesinella Conil & Longerstaey in Conil et al., 1980, by a longer uncoiled part, and the shapes of tests and septa. This new genus is differentiated from Corrigotubella Ganelina, 1966 by its reduced coiled initial part with less endothyrid chambers, and cribrate apertures; and from Rectogranuliferella Conil & Lys in Mansy et al., 1989 by the absence of biseriate stage.
Occurrence: Biozones 2 (Mikhailovian) and 3 (Venevian) of Akiyoshi area.
(Kobayashi and Vachard (2022)). [details]
From editor or global species database
Image from typetaxon