A preliminary list of the obligate subterranean fauna of the British Isles Various books and papers published over the past 60 years provide lists of the obligate subterranean fauna (= troglobitic, = stygobitic, = phreatobitic, = interstitial) of the British Isles. No two lists provide the same information and it is not easy to determine which animals are restricted to underground (= hypogean) habitats in these Islands. I have attempted to draw together all of these lists to compile a list of “all” hypogean species. In doing so some species once considered obligate (e.g. some ostracods, a beetle), but which are not, have been eliminated. The following list is the first draft (V1.0) and will be incomplete. Please help to improve this list by sending me relevant information that you have. (Email: email@example.com).
Notation: (i) = principally an interstitial animal, ? may not be obligate
Aquatic obligate hypogean species (Stygobites) (35, 14 + 21(i)) Annelida: Oligocheata (3)
Trichodrilus cantabrigiensis (i)