laeotropic

laeotropic

(ˌliːəʊˈtrɒpɪk)
adj
turning or forming a spiral to the left or anticlockwise
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References in periodicals archive ?
The direction of the cleavage planes forming the micromere quartets alternates between dexiotropic (clockwise) and laeotropic (counterclockwise), with the first quartet usually resulting from a dexiotropic division to the eight-cell stage.
The cleavage pattern of N fusca, shown in Figure la, b, demonstrates that each duet of micromeres is actually generated by a laeotropic division of the macromeres, while divisions of the micromeres occur in a dexiotropic direction.
The only other reported example of a laeotropic division forming the first set of micromeres is the counterclockwise cleavage to first quartet in some sinistral species of gastropod molluscs which produce a left-handed shell (1).