Discretella pseudodieneri, Leu & Bucher & Vennemann & Bagherpour & Ji & Brosse & Goudemand, 2022
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publication ID |
https://doi.org/ 10.1186/s13358-022-00259-x |
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persistent identifier |
https://treatment.plazi.org/id/038B1D1D-6445-FF9C-FCA1-EB5DD2F4F9C7 |
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treatment provided by |
Felipe |
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scientific name |
Discretella pseudodieneri |
| status |
sp. nov. |
Discretella pseudodieneri n. sp.
Figs. 15F, H, K, M, P View Fig ; 16G–I, K, L, N, O View Fig
2013 Neospathodus dieneri Sweet ; Yan et al., p. 516, fig. 6S (only).
2014 Neospathodus dieneri Sweet ; Maekawa & Igo in Shigeta et al., p. 224, fig. 162, nr. 40–42, 46–54 (only).
2014 Discretella sp. indet. A; Maekawa & Igo in Shigeta et al., p. 202–207, fig. 151.13–151.15 (only).
2015 Discretella sp. ; Chen et al., p. 112, fig. 8.12.
2018 Neospathodus dieneri Sweet ; Maekawa in Maekawa et al., p. 26, fig. 15.32–15.34 (only).
2021 Neospathodus cf. dieneri discreta ; Sun et al., fig. 5.10.
2021 Discretella sp. A ; Sun et al., fig. 6.15.
Etymology: Named after its superficial resemblance to Ns. dieneri .
Holotype: specimen illustrated in Fig. 16O View Fig .
Paratype: specimen illustrated in Fig. 16H View Fig .
Type locality: Shanggang road cut, Luolou formation, Guangxi Province, China.
Type level: Luolou Formation, within the early-to-middle Smithian limestones ( Owenites beds).
Number of specimens:>30
Diagnosis. Segminate P 1 element, laterally flattened. Few, discrete, large denticles. Terminal cusp. Flat to slightly posteriorly upturned basal margin. Asymmetrical basal cavity.
Description. Tese P 1 elements have markedly discrete denticles and a relatively large cusp, sometimes slightly larger than the other denticles that is situated terminally. In early ontogenetic stages (for adult forms, see Leu et al., submitted), the elements bear 3 erect to slightly and gradually reclined denticles. Te basal margin is straight to slightly upturned posteriorly. In aboral view, the basal cavity is sub-rounded to lanceolate and asymmetrical.
Remarks. Te P 1 element of this species shows some superficial similarities with that of Neospathodus dieneri , but differs in being laterally flattened and having much less denticles (usually 3, vs. 5 to 10 in Ns. dieneri ). Moreover, N. dieneri ranges up to the early Smithian only, whereas D. pseudodieneri occurs in the middle Smithian Owenites beds. Included here are also specimens where the cusp is less discrete, more robust and broader at the base ( Figs. 15M View Fig , 16L View Fig ).
Occurrence. Tahogawa Member, Olenekian Nv. ex gr. waageni Zone , Japan ( Maekawa et al., 2018). Jiarong, Discretella discreta Zone, Smithian age Nanpanjiang basin, southern Guizhou, South China ( Chen et al., 2015).
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