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.