The ostracodes are microcrustaceans which have colonised nearly every type of aquatic environment varying from fresh, to marine, and even phreatic waters. In sea, they occur from shore line down to hypabyassal depths. They are quite useful in demarcating shore line facies which is of prime importance in the petroleum exploration. Further, ostracode species have short life spans and many evolve rapidly. Fairly rapid evolving ostracode lineages are extremely useful ...
