Stage with four pairs of arms.

Stage with four pairs of arms.

Tip of a post-oral arm in a two-arm pluteus larva.

Stage with three pairs of arms.

Post-oral arms of a six-arm pluteus larva.

Early stage with two arms. Detail of a post-oral arm.

Podia.

Larva with six arms.

Early eight-arm stage. Oral view showing digestive tract and vestibule invagination next to the left coelom.

Stage with three pairs of arms.

Stage with four pairs of arms.

Early stage with two arms (post-oral).

Stage with three pairs of arms.

Archenteron during invagination.

Found during an artificial fertilization experiment. We do not know if it is the result of abnormal development or if the larva was reproducing asexually.

Oral region with the lantern of Aristotle in formation.

Lantern of Aristotle.

After artificial fertilization and raising embryos in the laboratory, blastulae hatch from the vitelline membrane and begin to swim. Development occurs in the water column from gastrulation to pluteus larva stage until metamorphosis.

Early stage with two arms (post-oral).

Larva with six arms. Mouth

Structure in the anal region.