noun, plural plan·u·lae [plan-yuh-lee] /ˈplæn yəˌli/. Zoology.
Examples from the Web for planula
The free larval stage thus reached is similar to the ordinary Hydrozoon planula.
The planula occurs in the majority of sessile forms of Hydrozoa except the Tubularid and Hydra.
In Aeginopsis a planula is formed by multipolar immigration.
This new individual is at first an active free-swimming larva called a planula, which does not resemble either a medusa or polyp.Elementary Zoology, Second Edition|Vernon L. Kellogg
The one group contains the larva of the Cœlenterata or Planula, the other group the larv of all the other forms.The Works of Francis Maitland Balfour, Volume III (of 4)|Francis Maitland Balfour