Dorsetensia liostraca Buckman 1892
Creators: name: Sandoval, José
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Ammonoidea
Sonniniidae
Dorsetensia
Dorsetensia liostraca

description: Dorsetensia liostraca Buckman, 1892 [M]
(Figs 8F; 14 P-Q)
Dorsetensia liostraca Buckman, 1892: 310, pl. 53, figs 11-16, pl. 55, fig. 3 (LT designed by Huf 1968: 98) to fig. 5, pl. 56, fig. 1. — Dorn 1935: 101, pl. 9, fig. 5, pl. 22, fig. 3, pl. 27, fig. 1. — Kopik 1967: 25, pl. 6, fig. 4, pl. 7, figs 1-4. — Morton 1972: 506, pl. 102, pl. 103, figs 1, 2, pl. 104, figs 1, 2. — Sandoval 1990: pl. 2, fig. 10. — Fernández-López & Mouterde 1994: 133, pl. 1, figs 8-11. — Dietze et al. 2013: 38, pl. 3, figs 5, 8. — Chandler & Whicher 2015: pl. 20, fig. 2. — Énay & Mangold 2021: 54, pl. 7, figs 2, 3, pl. 8, figs 1-3.
Dorsetensia liostraca liostraca – Huf 1968: 97, pls 30-40 (cum syn.). — Fernández-López 1985: 61, text-fig. 6C. — Ohmert et al. 1995: 60, text-figs 9, 10, pl. 2, fig. 3. — Dietze et al. 2011a: 222, pl. 4, figs 1-7, pl. 5, figs 1-4, pl. 6, figs 1-3, 5, 7 (cum syn.).
Dorsetensia liostraca subtecta – Huf 1968: 103, pls 41-46, pl. 47, fig. 1 (cum syn.). — Dietl et al. 1984: 310, fig. 2/1. — Schlegelmilch 1985: 66, pl. 20, fig. 3 (HT refigured). — Ohmert et al. 1995: 59, pl. 1, fig. 6, pl. 3, fig. 1.
Dorsetensia liostraca tecta – Huf 1968: 107, pl. 47, figs 2-4, pls 48-51 (cum syn.). — Ohmert in Wittmann 1983: pl. 2, fig. 2. — Ohmert et al. 1995: 62 pl. 2, figs 1, 2.
Dorsetensia (Dorsetensia) subtecta – Pavia 1983: 62, pl. 5, figs 3, 8.
Dorsetensia subtecta – Galácz 1991b: 866, text-fig. 3b, pl. 2, fig. 4. — Fernández-López & Mouterde 1994: 134, pl. 2, figs 8-11, pl. 3, fig. 1.
MATERIAL EXAMINED. — JA2.40.1, JGa2.31.44, JGa2.31.45, JGa7.32.2, JGa7.32.3, JGa7.32.4, JGa7.32.5, JGa7.32.6, JGa7.32.10, JGa7.32.14.
MEASUREMENTS. — See Table 25.
DESCRIPTION
All Subbetic specimens are incomplete, some preserving part of the BC. Shells are medium-sized, involute to moderately involute with narrow to moderately narrow umbilicus, more in outer whorls than inner ones. The whorl section, subrectangular in the inner whorls, becomes high compressed ogival to triangular in the outer ones. The umbilical wall is vertical, the umbilical edge is rounded, the flanks are more or less convex, and the venter has a well-separated floored keel. The inner whorls bear poorly developed ribs, some simple, some bifurcate, slightly sinuous and ventrally projecting, lacking nodes or spines. The middle and outer whorls become smooth. The suture line (Fig. 8F) is rather simple with a wide, shallow, and seldom branched L. The saddles are slightly indented with a broad base, and there are three well-differentiated umbilical lobes.
REMARKS
According to Huf (1968: 97) and Dietze et al. (2011a: 222, 223), the separation of all the members of the “liostraca-group”, Dorsetensia tecta, D. subtecta, and D. liostraca, is purely artificial as they are in reality synonymous. All other Dorsetensia species are more evolute, have a rectangular or subrectangular whorl section, a lower rate of whorl expansion, and the ribbed stage is usually more persistent.
DISTRIBUTION
Specimens of Dorsetensia, belonging to the group of D. liostraca, has been mentioned in the lower part of the Humphriesianum Zone from numerous localities: England (Buckman 1892; Parsons 1977; Chandler et al. 2014; Chandler & Whicher 2015), Scotland (Morton 1972, 1976), France (Pavia & Sturani 1968; Rioult 1980, Pavia 1983; Pavia et al. 2013, Fernández-López & Mouterde 1994, De Baets et al. 2008), Germany (Buck et al. 1966; Huf 1968; Dietl & Rieber 1980; Ohmert et al. 1995; Dietze et al. 2008, 2011a, 2013), Poland (Kopik 1967), Spain (Iberian Mountain range and Betic Cordillera; Fernández-López 1985; Sandoval 1983, 1990), the Caucasus, the Transcaucasus (Azarjan 1982; Rostovtsev 1991), the Arabian Peninsula (Énay & Mangold 1994, 2021), and Tibet (Westermann & Wang 1988). In South America it occurs in Argentina and Chile (Westermann & Riccardi 1972; Hillebrandt 2001) and in North America it is found in Oregon, United States (Imlay 1973, 1986; Poulton et al. 1992). In the Subbetic domain, D. liostraca occurs in the Humphriesianum Zone, Romani Subzone from Sierra de Gaena (sections, JGa2 and JGa7), Lucena (Córdoba Province), and from Sierra Arana (section JA2; Granada Province).
description: Published as part of Sandoval, José, 2022, Sonniniidae Ammonitina, Middle Jurassic from Southern Spain: taxonomic, biostratigraphical and palaeobiogeographical analysis, pp. 801-851 in Geodiversitas 44 (27) on page 841, DOI: 10.5252/geodiversitas2022v44a27, http://zenodo.org/record/7150329