Stygiiulus fimbriatus (Strasser, 1971) comb. et stat. nov. Remarks: The new locality of S. fimbriatus comb. et stat. nov., Cave Foran di Landri, is an active cave with a stream running through it year-round, flowing out of the entrance, after passing through a series of syphons (four discovered so far). All examined specimens were found right beyond the first two syphons, ca
40 meters from the entrance. This part of the cave includes a number of ponds, and it probably becomes
completely flooded during rainy periods (Canciani 2019). Part of the individuals was observed moving
on the surface of the ponds – a behaviour most likely associated with a filtrating rather than chewing
feeding mode, in which small organic particles adhere to the fine and densely set teeth of the pectinate
lamellae and to the cilia of the hypopharynx.
The cave of San Giovanni d'Antro (the type locality) is of the same type as Foran di Landri, and
Strasser (1971a) noted that it was occasionally flooded.