Hexagonellidae Crockford, 1947
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publication ID |
https://doi.org/ 10.5281/zenodo.13652021 |
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persistent identifier |
https://treatment.plazi.org/id/92125B5E-2400-FF92-FFD0-652F76DB68CB |
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treatment provided by |
Felipe |
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scientific name |
Hexagonellidae Crockford, 1947 |
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Family Hexagonellidae Crockford, 1947 View in CoL Genus Coscinium Keyserling, 1846
Type species: C. cyclops Keyserling, 1846 , by subsequent designation of Nikiforova 1938; Lower Permian, Timan, Russia.
Diagnosis.—Reticulate colonies built by anastomosing flattened bifoliate branches. Mesotheca trilayered, with longitudinal ridges. Autozooecial chambers tubular, hemispherical in cross section adjacent to mesotheca, indented ovoid to circular distal to mesotheca. Autozooecial apertures rounded, with distinct peristomes and lunaria. Diaphragms sparse. Vesicular skeleton consisting of small flat vesicles (after Utgaard 1983).
Remarks.— Coscinium Keyserling, 1846 differs from the most similar genus Hexagonella Waagen and Wentzel, 1886 in having smaller and less abundant vesicles and also in and fewer vesicle−built ridges on the colony surface.
Stratigraphic and geographic range.—Upper Carboniferous to Lower Permian; Russia, Spain.
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