Sinistral and dextral, in some scientific fields, are the two types of chirality ("handedness") or relative direction.
Other disciplines use different terms (such as dextro- and laevo-rotary in chemistry, or clockwise and anticlockwise in physics) or simply use left and right (as in anatomy).
A small minority of species and genera have shells in which the coils are almost always sinistral (left-handed).
[2] The most obvious characteristic of flatfish, other than their flatness, is their asymmetric morphology: both eyes are on the same side of the head in the adult fish.
Primitive spiny turbots include equal numbers of right- and left-sided individuals, and are generally more symmetric than other families.