What other characters are visible?
The amnion surrounding the juvenile rudiment has polka-dot pigment spots.
The larval episphere is proportionally small (compared to lappets) and the juvenile inside has two small eyes.
The larval lobes and/or lappets have pigment spots or patches. The juvenile has two small eyes.
The larval episphere is enormous (>700 µm) and pyramid or dome-shaped with lobes that are somewhat floppy. No pigment spots or patches.