At present, a good number of stygobiontes can be found only among the harpacticoid and cyclopid copepods, which include the following species and subspecies, for the most part endemic to Sicily:
Diacyclops clandestinus Diacyclops crassicaudis lagrecai Diacyclops crassicaudis trinacriae Eucyclops ibleicus Halicyclops troglodites Metacyclops stammeri Metacyclops subdolus Schizopera lagrecai Nitocrella stammeri Attheyella paranaphtalica Elaphoidella italica Parastenocaris kalypso Parastenocaris trinacriaeOther stygobitic taxa, such as amphipods, isopods, thermosbaenaceans and syncarids are present with fewer or no species.
The only representative of the widespread amphipod genus Niphargus is Niphargus longicaudatus, the other subterranean amphipods of the region being Tyrrhenogammarus catacumbae, Rhipidogammarus rhipidophorus and the following Pseudoniphargus species and subspecies:
Pseudoniphargus adriaticus Pseudoniphargus africanus italicus Pseudoniphargus inconditus Pseudoniphargus sodalisThe only isopod species are the widespread Microcharon marinus and Typhlocirolana moraguesi. Thermosbaenaceans are represented by the stygobitic species Tethysbaena siracusae.
However, it may be realistic to expect that the above list could be certainly extended in the future, since intensive stygofaunistical research in this province, carried ou by the Zoological Departments of the universities of Catania and Rome, already seem to indicate that the stygofauna of this province could be more rich and diversified than previously thought.