Spiralians
Spiralians are a hypothetical group of organisms that exhibit a specific developmental pattern known as spiral cleavage. This pattern is characterized by the diagonal orientation of cleavage planes relative to the polar axis of the egg, resulting in daughter cells that are offset from one another. This spiralian development is a key feature observed in many invertebrate phyla, particularly within the protostome lineage.
The arrangement of cells during spiralian cleavage often leads to the formation of a spiral pattern when
Spiralian development is a significant characteristic used in phylogenetic studies to group and understand evolutionary relationships