Structure of the ampullae of Millepora spp. is defined by the structure of the tissues.

An earlier post presented an image of the degradation of the tissue overlying the ampulla---and hence medusoid---of Millepora sp. cf. platyphylla.  An image of lower magnification of the identical slide shows the structure that has been compromised, toward the periphery of the hollow that is the ampulla.  Pylons remain beyond the central part of the disk.

Below, another image, this time of a male medusoid gives a better idea of the structure of tissues of an intact covering of an ampulla.  The pylon-like structure is clearly identifiable.  Individual spermatozoa are also clearly visible.