Efforts to make the river more accessible are still in the embryonic stage.

During the embryonic stage of many insects and the postembryonic stage of primitive insects, 11 abdominal segments are present.

It lacks a shell except during its early embryonic stage.

However, only cells that are tolerant to self tissue will survive the embryonic stage.

They are gelatinous, mostly transparent pteropods, and they only have shells in their embryonic stage.