planispiral
From ZooTerms (Dictionary of Invertebrate Zoology)
Revision as of 23:38, 13 September 2013 by Andreas Plank (Talk | contribs)
planispiral (adjective; Latin planus, flat; spira, coil): (Mollusca: Gastropoda) Shells coiled in a single plane like a flat spiral with symmetrical sides; loosely used for shells whorled in a discoid form with asymmetrical sides.
See also: isostrophic
