Gut during early eight-arm stage.

Vestibule in an eight-arm pluteus larva.

Montagem de fotos de uma larva plúteos da bolacha-do-mar Clypeaster subdepressus mostrando sua tridimensionalidade.

Stage with four pairs of arms.

Larva with three pairs of arms.

Stage with three pairs of arms.

Larval epithelium during the growth of the antero-lateral arms (2nd pair).

Early growth of post-oral arms and evagination of coelomic sacs from the archenteron.

Four-arm stage.

Stage with four pairs of arms.

Larva with two pairs of aarms and early development of postero-dorsal arms on the body sides.

Four-arm stage.

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

Spine on the posterior region.

Early eight-arm stage, lateral view.

Larva with six arms.

Aboral surface.

Stage with four pairs of arms.

Larva with six arms.

Stage with four pairs of arms.

Lateral view. Detail of the lantern of Aristotle under the peristomial membrane (where mouth will open).

Early stage with two arms (post-oral).

Larva with four pairs of arms.

Vestibule invagination in a four-arm pluteus larva.

Growth of antero-lateral pair of arms (2nd pair).

Oral region.

Stage with four pairs of arms.