Mesonerilla prospera is a species of invertebrate in the Nerillidae family endemic to Bermuda. In 2000, M. prospera was put on the IUCN Red List under the critically endangered category. The IUCN states that "there are problems with the Order name and the correct placement of the family."
Atlantasellus is a genus of crustaceans, and the only member of the family Atlantasellidae. It contains these species:
Barbouria is a genus of shrimp in the family Barbouriidae. It is monotypic, being represented by the single species Barbouria cubensis.
Arubolana aruboides is a species of crustacean in the family Cirolanidae. It is endemic to Bermuda.
Bermudamysis speluncola is a species of crustacean in the family Mysidae, endemic to Bermuda, and the only species in the genus Bermudamysis.
Cocoharpinia iliffei is a species of crustacean in the family Phoxocephalidae. It is endemic to Bermuda.
Erebonectes is a genus of crustacean in family Epacteriscidae, containing two troglobitic species. E. nasioticus was discovered in Bermuda and described in 1985; it is listed as critically endangered on the IUCN Red List. E. macrochaetus was found on Middle Caicos and described in 1994.
Idunella sketi is a species of crustacean in family Liljeborgiidae. It is endemic to Bermuda.
Ingolfiella longipes is a species of amphipod crustacean in the family Ingolfiellidae notable for its orange striped coloration. It is known from a single specimen held at the Naturalis Biodiversity Center. It was collected from Walsingham Sink Cave, an anchialine cave in Hamilton Parish, Bermuda, and is thus considered to be critically endangered.
Paracyclopia is a genus of copepods in family Pseudocyclopiidae, containing only the species P. naessi. It is endemic to Bermudan karsts and is critically endangered.
Platyops sterreri is a species of crustacean in the family Mysidae, endemic to Bermuda, the only species in the genus Platyops.
Pseudoniphargus grandimanus is a species of crustacean in family Hadziidae. It is endemic to Bermuda.
Spelaeoecia bermudensis is a species of ostracod in the family Deeveyidae.
Spelaeoecia is a genus of crustaceans in the family Thaumatocyprididae. One species, the Bermudan endemic S. bermudensis, is listed as critically endangered on the IUCN Red List. It contains the following species:
Speleoithona bermudensis is a species of crustacean in the family Speleoithonidae. It is endemic to Bermuda. Its natural habitat is karsts.
Speleophria bivexilla is a species of copepod in the family Speleophriidae. It is endemic to Bermuda.
Speleophria scottodicarloi is a species of crustacean in the family Speleophriidae. It is endemic to Chalk Cave, a collapsed cave in Smith's Parish, Bermuda, and it listed as critically endangered on the IUCN Red List. The pool it inhabits also contains Barbouria cubensis, Somersiella sterreri and Paracyclopia naessi.
Typhlatya is a genus of shrimp in the family Atyidae. These are small, stygobitic shrimp found in the West Mediterranean region, Caribbean region, Ascension Island and the Galápagos, although the individual species often have very small ranges. Species in this genus are found in salt, brackish and fresh waters, mostly in anchialine habitats and none in the open sea.
Platycopiidae is a family of copepods. Until the description of Nanocopia in 1988, it contained the single genus Platycopia. It now contains four genera, three of which are monotypic; the exception is Platycopia, with 8 species.
Nerillida is an order of annelid worms in the class Polychaeta. It contains Mesonerilla prospera, a critically endangered species on the IUCN Red List.
