Dextral shell - definition of Dextral shell by The Free Dictionary
|(Zool.) ||a spiral shell the whorls of which turn from left right, or like the hands of a watch when the apex of the spire is toward the eye of the observer.|
See also: Dextral
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive
The whorls remain barely in contact in the widely phaneromphalous dextral shell
of Lesueurilla Koken, 1896 in which coiling is essentially planispiral (Fig.