Early cleavage in Phoronis muelleri (Phoronida) displays spiral features.

  title={Early cleavage in Phoronis muelleri (Phoronida) displays spiral features.},
  author={Markus Pennerstorfer and Gerhard Scholtz},
  journal={Evolution & development},
  volume={14 6},
The view that early cleavage in Phoronida follows a radial pattern is widely accepted. However, data supporting this characterization are ambiguous. Studies have been repeatedly reporting variation between individual embryos, and the occurrence of embryos exhibiting oblique divisions or nonradial cell arrangements. Such embryos were often considered to represent variation within radial cleavage, or artificial appearances. Cleavage in Phoronis muelleri was previously characterized as "derived… CONTINUE READING
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