Anus in the aboral surface of the juvenile (red structure) and fecal pellets being released.

Early eight-arm stage.

Skeleton and digestive cavity.

Oral region with the lantern of Aristotle in formation.

Oral region with the lantern of Aristotle in formation.

Aboral surface.

Stage with three pairs of arms.

Podia and spine.

Oral region.

Advanced stage with the archenteron near the apical plate.

Stage with four pairs of arms.

Four-arm stage.

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

Oral region with the lantern of Aristotle in formation.

Early stage with two arms (post-oral).

Stage with four pairs of arms.

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.

Lantern of Aristotle in the oral region.

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

Skeleton formation of post-oral arms.

Early eight-arm stage.

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

Anus and anal plate.