Witchellia rubra
Creators: name: Sandoval, José
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Ammonoidea
Sonniniidae
Witchellia
Witchellia rubra

description: Witchellia rubra (Buckman, 1926) [M]
(Fig. 12 E-G)
Rubrileiites ruber Buckman, 1926: T. A. 6, pl. 642 (HT).
Witchellia aff. rubra – Morton 1975: 56, pl. 9, figs 1-34.
Witchellia cfr. rubra – Pavia 1983: pl. 5, fig. 9.
Witchellia rubra – Fernández-López 1985: 78, text-fig. 8B, pl. 7, fig. 1. — Hernández-Molina et al. 1991: fig. 15.3.
Witchellia albida – Sandoval 1990: pl. 2, fig. 1.
non Witchellia rubra – Sandoval 1990: 146, pl. 1, fig. 7 (corresponds to Witchellia striata n. sp.).
Witchellia sp. – Dietze et al. 2005: 61, fig. 34c, f.
Witchellia cf. rubra – Chandler et al. 2006: fig. 8(3). — Dietze et al. 2007: 15, pl. 5, fig. 1.
Witchellia cf. sayni/pseudoromanoides – De Baets et al. 2008: 574, figs 5d, e.
MATERIAL EXAMINED. — JAC3.71.4, JAC3’.4.2, JAC3’.4.11, JAC4.64.3, JAC4.64.5, JAC22.56.14, JAC22.56.15, JAC22.56.16, JAC22. R.8, JFA.15.1 and JFA.16.2.
MEASUREMENTS. — See Table 15.
DESCRIPTION
Medium to relatively large macroconchs with rather involute coiling(U/D varying from 0.22 to 0.30), broad whorl expansion, narrow and relatively deep umbilicus. The section, subrectangular compressed on inner and intermediate whorls, becomes subtriangular in the adult BC, where the ventral region is narrow with a relatively high keel. The umbilical wall is almost vertical, the umbilical edge rounded and the flanks gently convex.Inner and intermediate whorls have weak irregular ribs, generally simple, flexuous, and subradial, with the ventral termination frequently projecting forward. The PH end, at times the intermediate whorls, and the BC are almost smooth and have no tubercles or thickening of the ribs near the umbilical border. The septal suture is simple with L wide and short.
REMARKS
The HTs of W. albida and W. rubra are remarkably alike in size, coiling, whorl section, keel, and ornamentation. Judged by these external morphological characters, the two species could be synonymous. In this case, W. rubra would have nomenclature priority because it was nominated by Buckman (1926: T.A. 6, pl. 642) and W. albida was nominated by Buckman in the same year, but in pl. 687. The only appreciable distinction is the septal suture, which is more complex in W. albida than in W. rubra. Also, the types of each species come from different faunal horizons, since W. albida is from the Ovale Zone, Bj-5 horizon (Chandler et al. 2006), whereas the type of W. rubra is from the Laeviuscula Zone and Subzone, Bj-9 horizon (Dietze et al. 2007).
DISTRIBUTION
The type horizon of “ Rubrileiites ” ruber is in the upper part of the Laeviuscula Zone, Laeviuscula Subzone, Bj-9 horizon (Dietze et al. 2007). In the Iberian range (Spain), most of the specimens are from the Laeviuscula Zone, but some specimens are reworked together with fossils from the base of the (Sauzei) Propinquans Zone (Fernández-López 1985: 79). Subbetic specimens are from the upper part of the Laeviuscula Zone (Laeviuscula Subzone) and of the lower part of the Propinquans Zone from Sierra Alta Coloma area (section JAC3, JAC3’, JAC4, JAC22; Jaén Province), and from Rio Fardes (section JFA; Gorafe, 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 pages 829-831, DOI: 10.5252/geodiversitas2022v44a27, http://zenodo.org/record/7150329