YANGCHIENIIDAE Leven, 1987
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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-1162-FFD0-FF49-05C1FB20F3EE |
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treatment provided by |
Felipe |
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scientific name |
YANGCHIENIIDAE Leven, 1987 |
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Family YANGCHIENIIDAE Leven, 1987 View in CoL
Test small, fusiform or ellipsoidal; juvenarium small; in the first internal whorls winding at an angle to subsequent ones; wall with diaphanotheca; septa are straight; massive, ribbon-shaped chomata; the aperture is distinct. The evolution of the family proceeded by increasing the number of whorls and, accordingly, the size of the tests. It differs from other families in its wide ribbon-like chomata combined with straight septa and wall with diaphanotheca. Permian: Artinskian-Capitanian. Composition: Yangchienia Lee, 1934
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