Oral region with the lantern of Aristotle in formation.

Ossicles of the lantern of Aristotle in formation at the oral region.

Oral region with the lantern of Aristotle in formation.

Aboral surface (opposite to mouth).

Aboral surface (opposite to mouth).

Aboral region showing the skeleton (sterom).

Lantern of Aristotle in the oral region.

Aboral surface (opposite to mouth).

Oral region with the lantern of Aristotle in formation.

Aboral surface.

Oral region with the lantern of Aristotle in formation.

Aboral surface (opposite to mouth).

Oral region with the lantern of Aristotle in formation.

Ossicles of the lantern of Aristotle in formation at the oral region.

Aboral surface (opposite to mouth).

Aboral surface (opposite to mouth).

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

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

Oral region.

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

Aboral surface (opposite to mouth).

Aboral surface (opposite to mouth).

Skeleton on the aboral surface.

Aboral surface.

Spine.

Detail of teeth in the lantern of Aristotle.

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