Crassispira calligona is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

The sculpture is modified with the growth of the shell, so that on the later whorls of the adult the axials increase to as many as 25 and are very sharply pinched, equal and regular in size and spacing, even near the aperture and persistent with uniform strength from the anterior margin of the fasciole to the anterior suture and on the body whorl almost to the base of the columella.

The anal fasciole is smoothly concave, more than one-third the width of the whorl in the adult, margined posteriorly by a well-defined sutural cord lirated with 2 or 3 low threads but devoid of any axial ribbing or undulations.

The primary spirals in front of the periphery are low, broad, equal, and regular in size and spacing both upon the costal and intercostal areas numbering 4 to 6 on the later whorls of the spire, and separated by shallow channels in which two or three microscopically fine secondaries are usually intercalated.

The anterior fasciole is well defined, closely lirate, incrementally striate, and broadly emarginate at its extremity.