Haven't got DB yet, but have been reading UESP about it. Are Lurkers and Seekers lesser daedra aligned with Hermaeus Mora? I'm asking because there are signs that non-daedric lifeforms do seem to exist in daedric realms from the looks of some life in the Shivering Isles.

Seekers are directly stated to be servants of Herma-Mora in the loading screens.

Lurkers are just called "native" to the waters of Herma-Mora's realm, again, from loading screens.