Discretella, Orchard, 2005
publication ID |
https://doi.org/ 10.1186/s13358-022-00259-x |
persistent identifier |
https://treatment.plazi.org/id/038B1D1D-6444-FF9C-FF1B-EB5BD3A1FC27 |
treatment provided by |
Felipe |
scientific name |
Discretella |
status |
|
Discretella ? n. sp. B
Figs. 15N View Fig ; 16B View Fig
Number of specimens:>10
Diagnosis. Segminate P 1 element with subsymmetrical, posteriorly rounded and anteriorly tapered basal cavity. Large terminal, subtriangular, recurved cusp. Anterior process bearing a few denticles only.
Description. Te element shows a large cusp at the posterior end. In lateral view, the large, recurved, subtriangular cusp is about as high as the whole unit is long. An anterior process with two or three small upright to reclined denticles is present. Te lower margin is straight to concave. In aboral view, the subsymmetrical basal cavity is sub-rounded at the posterior margin and tapers towards the anterior end.
Remarks. Tese P 1 elements most closely resemble Discretella aff. discreta , but differ in having a much shorter anterior process and recurved denticles. Tey also bear some superficial resemblance with the P 1 elements of the Spathian–Anisian genus Cornudina , but differ in their conformation of the basal cavity. Urdyella unicorna n. gen. n. sp. usually has a much thinner and larger, sickleshaped cusp and a rounded basal cavity.
Because of the absence of a posterior process, some elements, especially arched ones, resemble homologous elements of Guangxidella and could possibly be assigned to that genus, but their basal cavity do not match those of Guangxidella and resemble instead that of Discretella aff. discreta , hence we tentatively retain them within Discretella .
Occurrence. South China: Luolou, Smithian age, Laren, Guangxi.
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