Srivastava and Banerjee, 1969
From dinoflaj3
Srivastava, N.C. and Banerjee, D., 1969: Hystrichosphaerids from Tertiary subcrops of Assam, India. J. Sen Memorial Volume, p.101-108, pl.1; J. Sen Memorial Volume Committee and Botanical Society of Bengal, Calcutta, India.