Discretella aff. discreta (Müller, 1956)

Figs. 15B, J; 16C?.

1989 Neospathodus bransoni (Müller); Tang, p. 417, pl. 29, fig. 10.

2009 Guangxidella ? sp. A; Orchard & Zonneveld, p. 780, fig. 14, parts 33, 34.

2013 Discretella discreta (Müller); Yan et al., p. 516, fig. 6W.

Number of specimens:>15

Diagnosis. Segminate P 1 element with rounded, upturned basal cavity at the posteriormost part. Large conspicuous cusp above basal cavity. Discrete, smaller upright denticles in the anterior part.

Description. Tese P 1 elements have markedly discrete denticles and a large cusp. Te lower margin is straight in the anterior and upturned at the posterior part. Te basal cavity is drop-shaped, being rounded at the posterior edge and tapered at the anterior end. Te cusp is relatively large and reclined. A small, accessory, posterior denticle is occasionally present.

Remarks. In comparison to Discretella discreta, this species has a rounded posterior margin of the basal cavity, more discrete denticles and the cusp is relatively larger and often recurved. In lateral view, the lower margin is upturned as in morphotype B of Discretella discreta (Maekawa & Igo, in Shigeta et al., 2014).

Occurrence. Luolou formation, Owenites beds Smithian age, Shanggang road cut, Guangxi, South China.