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In botany, a whorl or verticil is a whorled arrangement of leaves, sepals, petals, stamens, or carpels that radiate from a single point and surround or wrap around the stem or stalk. [ 1 ] [ 2 ] A leaf whorl consists of at least three elements; a pair of opposite leaves is not called a whorl.
Nuclear whorl(s)—small, generally smooth whorls formed within the egg, and constituting the apex of the shell; Protoconch—a larval shell of a mollusc; also refers to protoconch whorls of an adult shell; Teleoconch—all the whorls of a shell after the protoconch whorls; Nepionic whorls : the whorls immediately following the embryonic whorls.
A whorl (/ w ɜːr l / or / w ɔːr l /) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs).
A whorl can occur as a basal structure where all the leaves are attached at the base of the shoot and the internodes are small or nonexistent. A basal whorl with a large number of leaves spread out in a circle is called a rosette .
The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods.
The parietal wall with the outer lip (labrum): the area next to the penultimate whorl of the shell. The siphonal notch is situated at the top. The columellar wall with the columellar lip (labium): the wall next to the columella. The siphonal canal is situated at its base. The palatal wall: the outer free wall of the final whorl of the shell.
In gastropods, the body whorl, or last whorl, [1] is the most recently formed and largest whorl (or revolution) of a spiral or helical shell, terminating in the aperture.It is called the "body whorl" because most of the body of the soft parts of the animal fits into this whorl.
The petal whorl or corolla may be either radially or bilaterally symmetrical. If all of the petals are essentially identical in size and shape, the flower is said to be regular [3] or actinomorphic (meaning "ray-formed").