Body whorl, in a mollusc shell the most recently formed whorl of a spiral shell, terminating in the aperture
whorl | Whorl (botany) | Spindle whorl | Desmoulin's whorl snail | Body whorl |
Acacia verticillata, the prickly Moses, prickly-leaved wattle, star-leaved acacia or whorl-leaved acacia, a perennial tree species
Homeotic mutants in angiosperms are thought to be rare in the wild: in the annual plant Clarkia, (Onagraceae), homeotic mutants are known where the petals are replaced by a second whorl of sepal like organs, originating via a mutation governed by a single recessive gene.
The "Spindle of Necessity", according to Plato, is "shaped . . . like the ones we know"—the standard Greek spindle, consisting of a hook, shaft, and whorl.
It is common among Lady's Slipper orchids (Cypripedioideae) that the two lateral sepals are connate to form a synsepal in the outer whorl.
Syringonautilus (K438) which has been found in the Alps, on Spitsbergen, in India and Japan has a rapidly expanding evolute shell with a perforate umbilicus and suboval whorl section.
Identification can be made by looking for one-celled conidia, hyaline round to ellipsoid which are formed at the tips of whorled branches.