Larva with four pairs of arms.

Lantern of Aristotle.

Stage with three pairs of arms.

Oral region.

Stage with four pairs of arms.

Post-oral arm tip in a six-arm pluteus larva.

Lateral view.

Early stage with two arms (post-oral). Detail of the larval skeleton.

Esophagus.

Aboral region.

Post-oral arms and the larval skeleton.

Arm growing on an unusual site.

Detail of teeth in the lantern of Aristotle.

Early stage with two arms (post-oral).

Early with two arms.

Lantern of Aristotle in the oral region.

Stage with three pairs of arms.

Lateral view.

Stage with three pairs of arms and vestibule invagination on the left side.

Aboral region (normal position).

Stage with four pairs of arms.