This is the shell of a large sea snail from the Indian Ocean, but one that has the very rare reverse-turning spiral. Dextral is an antonym of sinistral. Vergence is used to provide an overall characterization, in the symmetry of folds, and can be used to observe changes in small-scale structures in relation to the axis of a large fold. Over 90%  of gastropod species have shells in which the direction of the coil is dextral (right-handed). Il movimento è sinistrale (mancino) se il blocco sull'altro lato del fallo si sposta a sinistra, o se a cavallo del fallo il lato sinistro si sposta verso l'osservatore. In structural geology, vergence refers to the direction of the overturned component of an asymmetric fold. Sinistral and dextral, in some scientific fields, are the two types of chirality (“handedness”) or relative direction..
, In geology, the terms sinistral and dextral refer to the horizontal component of movement of blocks on either side of a fault or the sense of movement within a shear zone. Schilthuizen M. & Davison A.
It encompasses 26 species in four genera divided into two subfamilies. Relative direction is from the point of view of the observer; a completely symmetrical object has a left side and a right side, from the observer's point of view, if the top and bottom and direction of observation are defined. As adjectives the difference between dextral and sinistral is that dextral is of or pertaining to the right side while sinistral is of, facing, or on the left side. Helices, chiral characteristics (properties), chiral media, order, and symmetry all relate to the concept of left- and right-handedness. A flatfish is a member of the ray-finned demersal fish order Pleuronectiformes, also called the Heterosomata, sometimes classified as a suborder of Perciformes. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Sinistrale e destrale , in alcuni campi scientifici, sono i due tipi di chiralità (" manualità ") o direzione relativa . During the 18th century, they were among the first Indonesian land snail shells brought to Europe by travelers and explorers. .
Movement is sinistral (left-handed) if the block on the other side of the fault moves to the left, or if straddling the fault the left side moves toward the observer.
"The convoluted evolution of snail chirality". Pareidae is a small family of snakes found largely in southeast Asia, with an isolated subfamily endemic to southwestern India.
As adjectives the difference between dextral and sinistral is that dextral is of or pertaining to the right side while sinistral is of, facing, or on the left side. Shell morphology terms vary by species group. Other disciplines use different terms or use left and right. ↘right handed. I rombi spinosi primitivi includono un numero uguale di individui di lato destro e sinistro e sono generalmente più simmetrici delle altre famiglie. In chemistry, such a molecule is called an enantiomer or is said to exhibit chirality or enantiomerism. Modern studies have focused on better understanding the evolutionary relationships within the group, as well as solving taxonomic problems. Altre discipline usano termini diversi (come dextro- e laevo-rotary in chimica , o in senso orario e antiorario in fisica ) o semplicemente usano sinistra e destra (come in anatomia ).
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