Ultrastructure studies and evolution on the shell of some brachiopods, middle Ordovician (Martellia shabjerehansis Percival, 2009) in Shabdjereh, Kerman (Central Iran)

Stratigraphic and paleontological studies on 6-section brachiopods from Lower to Upper Paleozoic in the Kerman region were performed by a joint Iranian-Italian team. In one of these sections in the Shabjareh area - Kerman - Kat Kouyeh Formation with geographical characteristics of 31º 5´ 56º, 10E, N, a complete sequence of the rotation of Ordovician sediments that had brachiopods in some horizons was studied. One of the typical brachiopods studied is Martellia shabjerehansis. Ultrastructural studies on this species and studies to study the shell changes of brachiopods from Cambrian to Devonian were selected from the samples taken by the SEM devices of the University of Milan. The reason for choosing this species was the existence of 28 completely healthy shells are very suitable for evolution from the young to adults of this specimen, two of which had well-preserved articulate shells, and the evolution of age from young to old specimens can be observed in it.