Sonninia (Sonninia) patella ( Waagen, 1867 )

Sandoval, José, 2022, Sonniniidae Ammonitina, Middle Jurassic from Southern Spain: taxonomic, biostratigraphical and palaeobiogeographical analysis, Geodiversitas 44 (27), pp. 801-851 : 812

Sonninia (Sonninia) patella ( Waagen, 1867) [M] ( Fig. 7E )

Ammonites patellum Waagen, 1867: 597 , pl. 25, figs 2, 3 (LT designed by Oechsle 1958).

Sonninia patella – Dorn 1935: 51, text-fig. pl. 5, figs 1, 2; pl. 14, figs 1, 6. — Pavia 1983: pl. 4, fig. 4. — Schlegelmilch 1985: 61, pl. 18, fig. 2 (LT refigured). — Rioult et al. 1997: 48, pl. 14, figs 3a, b. — De Baets et al. 2008: 571, fig. 6b. — Chandler & Whicher 2015: pl. 13, fig. 4 (reproduction of the original figure of Waagen 1867). — Dietze et al. 2020: 66, pl. 6, fig. 8, pl. 12, figs 4-5, pl. 14, fig. 18. — Sadki & Dietze 2021: 7, text-fig.10 (LT refigured) (cum syn.).

Sonninia cf. patella [M] – Dietze et al. 2009: 25, pl. 7, fig. 1, pl. 9, fig. 5.

MATERIAL EXAMINED. — JAC11. R.62 , JAC11. R.63, JAC13. R.2, JAC20.(7-2).1, JAC20.(7-6).5 and JAC20. R.1 .

MEASUREMENTS. — See Table 2.

DESCRIPTION

Medium-sized planulate shell, relatively involute with outer whorls being more involute than the inner ones. The whorl section is ovate, from subrectangular to compressed subtriangular. The umbilical wall, oblique in the inner whorls, becomes vertical in the last whorls. The convex flanks converge to a somewhat narrow venter, which bears a relatively prominent floored keel. The inner whorls, visible in a specimen, are ornamented with rather strong irregular, often bundled, radial sigmoid ribs, some of which split at a node located near the umbilical edge. Ribs erase gradually on the external whorls, and the BC end can be almost smooth.

REMARKS

S. (S.) patella is a frequently cited species, but, except for the HT, few specimens have been figured, and these show noteworthy intraspecific variations. The most similar species may be S. (S.) propinquans ( Bayle, 1878) , but the latter is slightly more evolute, has an ovate-ogival whorl section, no vertical umbilical wall, and more persistent ribbed and tuberculate stages.

DISTRIBUTION

The LT comes from an unknown level of the Sowerbyi oolith of Gingen/Fils of the eastern Swabian Alb ( Dietze et al. 2005; Sadki & Dietze 2021). The species usually occurs in the lower half of the Propinquans Zone of diverse Western European localities, but it has also been cited in the Laeviuscula Zone. Subbetic specimens are from the Propinquans Zone (Patella Subzone), from Sierra de Alta Coloma area (JAC11, JAC13, JAC20 sections, Jaén Province).

Figures

FIG. 7. — A-D, Sonninia (Sonninia) propinquans (Bayle, 1878) [M]: A, JAC13.R.1, Propinquans Zone, Sierra de Alta Coloma (JAC13 section); B, D, JAC11.8.8, JAC11.8.9, Propinquans Zone, Patella Subzone, Sierra de Alta Coloma (JAC11 section); C, JAC21.16.4, Propinquans Zone, Patella Subzone, Sierra de Alta Coloma (JAC21 section); E, Sonninia (Sonninia) patella (Waagen, 1867) [M], JAC20.(7-6).5, Propinquans Zone, Patella Subzone, Caminno de Casa Blanca section; F, G, Sonninia (Sonninia) falcata Haug, 1893 [M?], non Quenstedt, 1886: F, JAC21.17.5, Propinquans Zone, Patella Subzone, Sierra de Alta Coloma (JAC21 section); G, JCH.2.2, Propinquans Zone, Charilla, Jaén province (JCH section); H-K, Sonninia (Sonninia) corrugata (J. de C. Sowerby, 1824) [M]: H, I, JAC21.12.5,