Arm growing on an unusual site.

Ambulacral feet and spines.

Stage with three pairs of arms.

Stage with four pairs of arms.

Advanced stage with the archenteron near the apical plate.

Larva with six arms.

Aboral surface (opposite to mouth).

Durante a regressão dos tecidos larvais. Espículas do esqueleto da larva ainda estão presentes na região aboral.

Luz polarizada realça o esqueleto calcário mostrando a estrutura dos espinhos, pés e remanescentes do esqueleto larval.

Frontal view of a two-arm pluteus larva.

Stage with three pairs of arms.

Oral region with the lantern of Aristotle in formation.

Stage with three pairs of arms.

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

Early vestibule invagination in a six-arm stage.

Stage with four pairs of arms.

Início do estágio com 4 pares de braços. Vista oral mostrando tubo digestório e invaginação do vestíbulo junto ao celoma esquerdo.

Larva with six arms.

Larva with four pairs of arms.