KOKTJUBINIDAE Marfenkova, 1991
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publication ID |
https://doi.org/10.35463/j.apr.2024.02.07 |
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persistent identifier |
https://treatment.plazi.org/id/039C630F-117C-FFC9-FCEE-0463FE8BF287 |
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treatment provided by |
Felipe |
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scientific name |
KOKTJUBINIDAE Marfenkova, 1991 |
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Family KOKTJUBINIDAE Marfenkova, 1991 View in CoL
Test biserially coiled. Initially, the first three chambers might be multiserial and constitute a juvenarium followed by a rapidly expanding stage of one or two whorls. Because of the complex type of coiling, chamber shape is very variable in sections. Sutures indistinct or faint. No supplementary deposits. Oral valvula absent or faint. Wall thin, unilayered, microgranular in the juvenarium. In the adult whorls, the wall is differentiated with a tectum and an inner coarse layer with calcareous agglutinated particles, fine to medium-sized. Aperture on last chamber, basal, simple). Tournaisian–Serpukhovian.
Composition: Koktjubina Marfenkova, 1991 ; Praekoktjubina Vachard, Haig & Mory, 2014 ; Ulanbella Marfenkova, 1991 .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.