Myostomella pulchella Riedl, 1954 | Apr 3,4 - Jun 20, 1949 | | | 19 individuals. |
Plagiostomum sorrentinum Riedl, 1954 | Apr 3,4 - Jun 20, 1949 | 1 m | | 2 individuals. Steep wall, with Porifera and Bryozoens. |
Westbladiella falcifera Riedl, 1954 | Apr 3,4 - Jun 20, 1949 | 3 m | | 5 individuals, submarine Grotto with algae. |
Proxenetes axi Riedl, 1954 | Apr 3,4 - Jun 20, 1949 | | | 27 individuals. |
Lioniella petiti Riedl, 1954 | Apr 3,4 - Jun 20, 1949 | | | 3 individuals. |
Haloplanella multifida Riedl, 1954 | Apr 3,4 - Jun 20, 1949 | | | 13 individuals. |
Heterochaerus langerhansi (Graff, 1882) | 1952 | | | marine caves. |
Microstomum melanophthalmum Steinböck, 1933 | 1952 or earlier | | | marine caves. |
Proxenetes reisingeri Riedl, 1959 | prior to 1959 | 1.20 m | | found only one specimen of this species near Capo di Sorrenti in the surroundings of Naples. Found in a Balanus-Halichondria coenosis in a sub marine cavern. |
Proxenetes steinboecki Riedl, 1959 | prior to 1959 | sublittoral | | found two specimens of this species near Capo di Sorrenti in the surroundings of Naples. Found in sublittoral vegetation dominated by the alga Peyssonnelia and shaded by overhanging masses of rock . |