Species of the genus
Belosaepia reached in length and across and had a large
siphuncle that penetrated its oblique septa. The shell was endogastrically coiled. It had a small
belemnite-like guard, which took the form of a short horn at the posterior end of the shell; usually, only a small portion of the shell closest to the guard is preserved. The chambers in the shell closely resemble those present in the
cuttlebone of modern cuttlefish. ==Ecology==