Sea-Butterflies with a conical shell, straight on most of the length, more or less curved on the posterior third, and tapering to a point, the embryonic extremity, which shows a light constriction.
Creseis Rang, 1828:
« Shell very tapered, extremely thin, fragile and diaphanous, in the shape of a straight or curved horn, with an aperture almost always as wide as it is and generally without channel; no side appendages. » – P. C. Rang: “ Notice sur quelques mollusques nouveaux appartenant au genre Cléodore, et établissement et monographie des sous-genre Creseis”, Annales des Sciences Naturelles vol.13, Paris 1828, p.305.
Styliola Gray, 1847:
The genus could be, nowadays, monospecific. « Shell elongate-conical, straight or curved, with a smooth surface, circular section and aperture; the plane of the simple aperture is at right angles to the longitudinal axis and the margin is not oblique, angular, or sulcate. » – W. H. Dall: “The Mollusca od Porto-Rico”, Bulletin of the U. S. Fish Commission vol.20, Washington 1900, p.360.
