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4 results for “Circunula”
FIGURE 8. Circunula n in Revision of the Bivalvia from the Upper Jurassic Reuchenette Formation, Northwest Switzerland—Ostreoidea
FIGURE 8. Circunula n. gen. cotyledon (Contejean, 1859). Group of juvenile LVs attached interior, of a bivalved Trichites (CGN-ALO009-1, largest oyster specimens labelled from I-IV, see also Fig. 6), close to its ventral margin; Alombre aux Vaches (Canton Jura), Lower Kimmeridgian, Banné Marls. Scale x1.5.
FIGURE 7. Circunula n in Revision of the Bivalvia from the Upper Jurassic Reuchenette Formation, Northwest Switzerland—Ostreoidea
FIGURE 7. Circunula n. gen. cotyledon (Contejean, 1859). Ontogeny of ligament area (schematic). 1. LV, juvenile with a triangular, initially alivincular-areate ligament. 2. Recurving of the umbo (hypothetic). 3. Continuation of opisthogyrate twisting, ligament becomes prosodetic and opisthocline, posterior bourrelet overgrown by projection of the posterodorsal hinge margin; observations based on a group of juveniles (ALO009-1-I-IV, Figs. 6, 8). Scale x5.
FIGURE 6. Circunula n in Revision of the Bivalvia from the Upper Jurassic Reuchenette Formation, Northwest Switzerland—Ostreoidea
FIGURE 6. Circunula n. gen. cotyledon (Contejean, 1859). 1–3. Drawings of three juvenile specimens originally attached close together on a Trichites-shell (CGN-ALO009-1, see Fig. 8; Pl. 3.2–3), Alombre aux Vaches near Courgenay, Lower Kimmeridgian: 1, LV, umbo prosogyrate, ALO009-1-II; 2, LV, opisthogyrate, ALO009-1-I; 3, LV, opisthogyrate, ALO009-1- III. Scale x5.
FIGURE 5. Circunula n in Revision of the Bivalvia from the Upper Jurassic Reuchenette Formation, Northwest Switzerland—Ostreoidea
FIGURE 5. Circunula n. gen. cotyledon (Contejean, 1859). 1–4. Lectotype: 1, idealized drawing of a bivalved specimen, refigured from Contejean (1859, pl. 24, fig. 15), MC 27E-105, Rôce in Montbéliard, Lower Kimmeridgian; 2, anteroventral view of LV attached on a Trichites fragment (refigured from Contejean 1859, pl. 24, fig. 16); 3, external view of RV (with attached paralectotype, revealed during preparation); 4, anteroventral view. 5–6. Paralectotype, small LV (MC 27E-105a), attached on lectotype: 5, interior view; 6, prosodetic ligament area. 7. Paralectotype, RV interior, with opisthodetic ligament area, MC 27E-104, same locality and age as the lectotype. 8–9. Paralectotype, MC 27E-108, Arbouans near Montbéliard, France, Upper Oxfordian; 8, thick-shelled LV, idealized drawing refigured from Contejean (1859, pl. 24, fig. 17); 9, same LV, interior view. Scale bars 5 mm and 10 mm.
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