The genus Actinocythereis commonly occurs in the lower Miocene sediments of Kachchh, Saurashtra and Kerala basins. Among these basins, the genus thrives well in Kachchh basin, where it is represented by five species, including two new subspecies: Actinocythereis gujaratensis (Tewari and Tandon) karanpurensis n. subsp. and Actinocythereis vinjhanensis (Tewari and Tandon) lakhpatensis n. subsp., reported in this study. A. gujaratensis Tewari and Tandon, A. tumefaciens (Lyubimova and Guha) and A. vinjhanensis (Tewari and Tandon) have been previously described. The systematics along with paleoecological data of the genus presented.
Kachchh is a pericratonic basin in which Early Miocene sedimentation took place in a shallow marine environment. During the course of study of ostracods from these beds a detailed sampling carried out from a hill section (N 23°24',E 68°49') exposed about eight kilometres from Rampar village, towards Goyela-Matanomadh road. The sediment logical data and ostracod assemblage together reveals the fluctuation in relative sea-level. The change in ostracod assemblage in middle part indicating deepening i.e. middle shelf environment. This is followed by progressive shallowing of the basin marked by deposition of marl. The top part composed of limestone with full of mega fauna indicates again deeper water condition prevail in the area. The paleoecology of the genera viz. Actinocythereis, Neomonoceratina, Alocopocythere, Cytherelloidea, Pontocypris, Propontocypris, Pseudocythere, Semicytherura, Xestoleberis, Cytheropteron, Miocyprideis, Pokornyella and Occultocythereis is discussed in the paper.The overall evidence suggests that majority of the genera thrive well in near-shore to shallow marine environment and hence it is inferred that the beds of Early Miocene might have been deposited in near-shore to shallow marine conditions.
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