Stage with three pairs of arms.

Oral region with the lantern of Aristotle in formation.

Oral region.

Polarized light highlights the calcareous skeleton showing the structure of spines, podia, and remnants of the larval skeleton.

Larva with three pairs of arms.

Stage with four pairs of arms.

Regression of larval tissues. Spicules of the larval skeleton are still present in the aboral region.

Early vestibule invagination in a six-arm stage.

Larva with four pairs of arms.

Anus on the juvenile aboral surface (red curved structure).

Larva with six arms.

Aboral surface (opposite to mouth).

Larva with three pairs of arms.

Remnants of the larval skeleton in the aboral region of the juvenile.

Stage with four pairs of arms.

Early stage with two arms (post-oral).

Post-oral arms and the larval skeleton.