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8 results for “Matheronia”
Fig. 6 in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 6. Matheronia carinata sp. nov. from Valea Minişului. a. Transverse section showing the myophoral organisation (specimen IB 5443-1, holotype), specimen partly damaged, almost shell free. b. ibidem, reconstitution. c. ibidem, ventral view of the LV showing the acute ventral carina (ca). d. External view of RV with concentric growth lines (specimen IB 5443-3). e. Anterior view of a LV showing the acute carina (ca) slightly overriding the anterior shell side (specimen IB 5443-2). Scale bar 10 mm.
Fig. 8 in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 8. Bivariate scatter plot of Dap versus Ddv of the new Romanian species of Matheronia, showing shell size increase through time.
Fig. 5 in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 5. Matheronia nerae sp. nov. a to d, Nera valley. a, b. Antero-posterior transverse sections of bivalve specimens showing the transverse outline and the myophoral organisation of RV (specimen IB 5417A), holotype, conjoined sections. Arrows point to the convexity and concavity of the RV facing the myophores. c. external view of RV (specimen IB 5417C). d. transverse section of a LV showing the antero-posterior shell asymmetry (specimen IB 5417B). e. section of a LV showing the ventral double keel and antero-posterior shell asymmetry (specimen IB 5360, from Valea Măgurii quarry, Dobresti). Scale bar 10 mm.
Fig. 4 in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 4. Matheronia dacica sp. nov. Antero-posterior transverse sections of bivalve specimens showing the transverse outline and focusing on the myophoral organisation of RV. a. holotype, specimen IB 5391, from Caraşova Valley. b. ibidem, specimen IB 5398 from Beiului Valley. Scale bar 10 mm.
Fig. 2 in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 2. Stratigraphic logs of Lower Cretaceous successions with position of Matheronia bearing beds. a. Nera valley area (Reşiţa-Moldova Nouă zone). b. Cornet and north Dobreşti areas (Pădurea Craiului).
Fig. 7 in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 7. Matheronia silvaeregis sp. nov. Valea Maguri. a, b. Transverse antero-posterior serial sections (specimen IB 5353C- A, B) showing the RV myophores, the strong antero-posterior LV asymmetry, the compact thick lamellar anterior side and convex outside RV. Notice on section b the reduction of the pmc. Scale bar 10 mm.
Fig. 3 in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 3. Illustration of classical Matheronia species from the Barremian type locality of Orgon (SE France). Matheronia munieri Paquier. a. posterior view of a bivalve specimen showing the LV lamellar habit and flat RV (sample DG 110). b. internal view showing the myocardinal apparatus of the RV (sample DG 113); c. same specimen showing the uncoiled RV. d. Matheronia aptiensis Matheron, transverse antero-posterior section showing the myophores (Urgonia Museum collections). Specimens a to c, reference DG (Urgonia Museum), have been cleaned and prepared by Dominique Gesbert. Scale bar 10 mm.
Fig. 1a in New Species Of The Lower Cretaceous Genus Matheronia Munier-Chalmas (Bivalve Hippuritida) In Romania
Fig. 1a. Geographic distribution of Lower Cretaceous rudist bearing localities in Romania, with location of Matheronia beds. b. Geological map of the Nera valley area (Reşiţa-Moldova Nouă zone). c. Geological map of the Cornet area (Pădurea Craiului). d. Geological map of the area north of Dobreşti (Pădurea Craiului).
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