Definition of Planispiral. Meaning of Planispiral. Synonyms of Planispiral

- Planispiral is a condition in which a tubicolous s**** is coiled in a single horizontal plane and the diameter increases away from the axis of coiling...
- used to describe various kinds of freshwater snails whose s**** are planispiral, meaning that the s**** is a flat coil. Such s**** resemble a coil of...
- periods is often possible. Their fossil s**** usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs)...
- limestones of the Carboniferous period in Europe, the s**** of which is planispirally coiled and can be mistaken for the s**** of a cephalopod.[citation needed]...
- View of the spire side of the planispiral s**** of the freshwater snail Anisus septemgyratus. The body whorl is the outermost complete revolution of the...
- conical tube, the growth of which is coiled into an overall helical or planispiral shape, for reasons of both strength and compactness. The number of whorls...
- sole living cephalopods whose bony body structure is externalized as a planispiral s****. The animal can withdraw completely into its s**** and close the...
- high-spired the resulting s**** becomes. This may range from zero, a flat planispiral s****, to nearly the diameter of the aperture. Irregularities or "sculpturing"...
- internal, chambered, endogastrically coiled s**** in the shape of an open planispiral (a flat spiral wherein the coils do not touch each other), and consisting...
- Mount Kosciuszko, New South Wales, Australia. The shape of the s**** is planispiral. The width of the s**** is 2 mm, rarely up to 2.8 mm. Iredale T. (1943)...