Discretella discreta ( Müller, 1956 )

Leu, Marc, Bucher, Hugo, Vennemann, Torsten, Bagherpour, Borhan, Ji, Cheng, Brosse, Morgane & Goudemand, Nicolas, 2022, A Unitary Association-based conodont biozonation of the Smithian-Spathian boundary (Early Triassic) and associated biotic crisis from South China, Swiss Journal of Palaeontology (19) 141 (1), pp. 1-61 : 45

publication ID

https://doi.org/ 10.1186/s13358-022-00259-x

DOI

https://doi.org/10.5281/zenodo.13128050

persistent identifier

https://treatment.plazi.org/id/038B1D1D-6445-FF9D-FF1B-EFDBD397FDC7

treatment provided by

Felipe

scientific name

Discretella discreta ( Müller, 1956 )
status

 

Discretella discreta ( Müller, 1956)

Figs. 15C, G, L View Fig ; 16D, S View Fig .

*1956 Ctenognathodus discreta n. sp.; Müller, pp. 821– 822, pl. 95, fig. 28.

1989 Neospathodus discreta (Müller) ; Tang, p. 402, pl. 30, fig. 7.

2005 Discretella sp. A ; Orchard, p. 83, fig. 8.

2008 Discretella discreta (Müller) ; Orchard 2008, p. 402, figs. 8.18, 8.19.

2010 Discretella discreta (Müller) ; Beranek et al., p. 65, figs. 6.18, 6.19.

2014 Discretella discreta (Müller) ; Maekawa & Igo in Shigeta et al., pp. 196–202, figs. 141.13–141.33, 142–145, 146.1–146.30.

2018 Discretella discreta (Müller) ; Maekawa in Maekawa et al., p. 23, fig. 14.4.

Number of specimens:>20

Diagnosis. See Müller, 1956.

Description. Te carminate-to-segminate P 1 element has an upturned and inverted basal margin in the posterior one-third to one-half of the element. Te cusp is usually larger than the other discrete and upright denticles but not conspicuously.

Remarks. Maekawa & Igo (in Shigeta et al., 2014) described two different morphotypes, A and B, for Discretella discreta . Teir morphotype A would correspond to the holotype ( Müller, 1956) and their morphotype B has an upturned posterior margin and a relatively broader and triangular cusp. Although Maekawa & Igo (in Shigeta et al., 2014) have recently illustrated numerous specimens, the intraspecific variation of this species remains unclear due to its general scarcity. Based on their illustrations and unpublished material, there seems to be scope for further differentiation. Both morphotypes A and B have a posterior process and hence a tapered posterior margin of the basal cavity. However, some of our specimens do not develop a posterior process and have a rounded posterior margin at the basal cavity. Tose are here assigned to a different species, which for now is kept in open nomenclature ( Discretella aff. discreta ).

Occurrence. Wide global occurrence in the Smithian. Meekoceras beds, Nevada ( Müller, 1956). Euflemingites romunderi Zone, Canadian Arctic ( Orchard, 2008) . Jabal Safra, Oman ( Orchard, 2005). North Vietnam (Tang, 1989). Nv. ex. gr. waageni Zone, Taho Formation , Japan ( Maekawa et al., 2018).

Kingdom

Animalia

Phylum

Chordata

Order

Ozarkodinida

Family

Gondolellidae

Genus

Discretella

Loc

Discretella discreta ( Müller, 1956 )

Leu, Marc, Bucher, Hugo, Vennemann, Torsten, Bagherpour, Borhan, Ji, Cheng, Brosse, Morgane & Goudemand, Nicolas 2022
2022
Loc

Discretella discreta (Müller)

Orchard, M. J. 2008: 402
2008
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