The quicki guide lists these spawners for the PGM system
But in the dev kit there are two more, they are DinoSpawnEntries_Ocean_PGM_C and DinoSpawnEntries_Deepwater_PGM_C
So essentially in the dev kit there are two spawners for the ocean biome, and two for the deepwater biome.
@Jeremy Stieglitz are you or some other members of the development team able to clarify what is happening here? the the other two a type and ca nwe safely ignore them when editing spawners for a PGM map or are there in fact multiple spawners being used in these two biomes?