Gryphaea Bilobata

Gryphaea bilobata is an extinct species of bivalve belonging the gryphaea group, it is placed later on in the species evolutionary timeline, with early fossil specimens exhibiting a small size shell and oblong shape, where as this particular sub-species appears to be wider and flatter with a more circular shape, indicating a change in shell shape and size over time, potentially due to a change in feeding habits. Like all bivalves, gryphaea bilobatas shells were made up of two parts which were both different sizes, the bottom being smaller than the top. This can be observed in our high quality specimens which also exhibit other morphological details such as the shells hinges and growth lines, the samples also have a dull bronze colouration. approximately 7 cm in length and 5 cm wide, these excellent quality fossils are certainly ideal for serious collectors of marine and mollusc fauna as well as for educational use, to display the changing shape of fauna over geological time. Specimens will come supplied in a card tray with an information label.