Recent Ostracoda from the Deltaic Subenvironment and Shallow Inner Shelf, East Coast of India

A total of 24 ostracode species belonging to 14 genera are recorded from the Krishna River estuary and Gautami-Godavari estuary. The study reveals that the upper estuary is dominated by thin shelled Hemicytheridea andhraensis (Annapurna and Rama Sarma) and few fresh water ostracodes having low frequency (05) and diversity (2-3). The lower estuary ostracodes have some influence of marine ostracodes and comparatively high frequency (50-60) and diversity (08). Ostracodes recorded from the lower estuary are represented by Kallingella mckenziei Jain, Neosinocythere dekrooni (Kingma), Tanella gracilis Kingma, Neomonoceratina iniqua (Brady), Phlycetenophora orientalis (Brady) along with Hemicytheridea andhraensis (Annapurna and Rama Sarma). This study will be helpful in understanding and recognizing palea subenvironment and thus helpful in developing precise pafeodepositonal model which will give further lead to hydrocarbon exploration.