Hebertides jurassica Guinot, De Angeli & Garassino, 2007

Ossó, Àlex, Gagnaison, Cyril & Gain, Olivier, 2022, A re-appraisal of the middle-late Miocene fossil decapod crustaceans of the ‘ Faluns’ (Anjou-Touraine, France), Geodiversitas 44 (6), pp. 207-228 : 214

Hebertides jurassica Guinot, De Angeli & Garassino, 2007

( Fig. 4D, E )

Hebertides jurassica Guinot, De Angeli & Garassino, 2007b: 241- 260 , figs 1-3. — Van Bakel et al. 2009: 80. — Taylor et al. 2012: 71-83, fig. 1. — Taylor 2012: 9-11, fig. 2. — Jagt et al. 2015: 882. — Emmerson 2017: 323. — Ossó & Gagnaison 2019: 372- 373, fig. 3F-J . — Schweitzer & Feldmann 2019: 12, fig. 8.5.

Corystid – Guinot et al. 2007a: 53-55, fig. 1.

MATERIAL EXAMINED AND MEASUREMENTS (in mm). — Fragment of less than a left half of the carapace. ULB-IV-A (5): L = 19; W = 7.5.

LOCALITY AND HORIZON. — ‘Blandinerie’ quarry, Breil (Maine-et-Loire). ‘Savignean facies’, Langhian (middle Miocene).

DESCRIPTION

Left half of carapace longitudinally ovate, convex in both sections. Cuticle well preserved. Regions relatively well defined, slightly swollen and separated by weak, smooth grooves; medial regions faintly distinct. Dorsal surface of carapace covered by rounded granules at anterior half, grouped and aligned at posterior half. Orbit broad; inner orbital tooth blunt, as a fold; supraorbital margin sinuous, finely serrate, with two V-shaped fissures; outer orbital tooth triangular, acute, prominent. Supraorbital area slightly depressed, smooth. Anterolateral margin convex, with three granular teeth (excluding the extraorbital one); the third the smallest. Posterolateral margin slightly convex. Protogastric regions slightly swollen, with two tubercles obliquely aligned at each lobe. Hepatic region subtriangular, well delimited by cervical and hepatic groove. Branchial regions slightly swollen. Ventral parts and appendages not present.

REMARKS

A complete specimen of Hebertides jurassica was reported by Ossó & Gagnaison (2019), which allowed a complete description of the species, and at the same time to confirm its Neogene age rather than Jurassic – as suspected ( Taylor 2012; Taylor et al. 2012) –, and the area of origin of the holotype, which was unknown at that time. The material of H. jurassica herein studied confirms the geographical origin and Miocene age of this species.

Figures

FIG. 4. — Decapod from the Tortonian of the ‘ Noyant-la-Plaine’ quarry, Doué-la-Fontaine (Maine-et-Loire): A-C, Lobocarcinus sismondai (von Meyer, 1843), ULB-IV-A (3): A, dorsal view; B, close-up of front in dorsal view; C, close-up of front and orbits in frontal view. Decapods from the ‘ Savignean facies‘ (Langhian) of the ‘Blandinerie’ quarry, Breil (Maine-et-Loire): D, E, Hebertides jurassica Guinot, De Angeli & Garassino, 2007, ULB-IV-A (5): D, left lateral view; E, dorsal view; F, G, ‘Ebalia’ cf. hungarica Müller, 1974a, ULB-IV-A (7): F, frontal view; G, dorsal view; H-M, Maja orbignyana Millet de la Turtaudière, 1865: H, ULB-IV-A (1), dorsal view; I, ULB-IV-A (2), left lateral view; J dorsal view; K, ULB-IV-A (23), frontal view; L, dorsal view; M, ventral view. Abbreviations: ab, basal antennal article; dsab, distal spines of basal article; ias, interantennular spine; iot, infraorbital tooth. Scale bars: A-E, H-M, 10 mm; F, G, 5 mm. Photographs by À. Ossó.