advolute
adj1
Biology, Malacology, Natural sciences Having or being a (mollusc) spiral shell in which the whorls touch along a line (but do not overlap).
- [...] of the same whorl, measured in a line parallel to the plane of bilateral symmetry; in a gyroconic or advolute shell, the most dorsal point most [...]2013, Neil H. Landman, Kazushige Tanabe, Richard Arnold Davis, Ammonoid Paleobiology, Springer Science & Business Media, →ISBN, page 842: