|  | site | site # (info) | collection date | kind | depth | substrate | salin | comments | reference | 
| A | Harbor of Messina, Sicily (Sicilia, Sicile, Sizilien, Sicula)), Italy | 241 
  map | Mar, Apr 1873 | type locality |  |  |  |  | Graff Lvon (1874): 124, 143 | 
| B | Gulf of Trieste (Trzaski Zaliv, Trscanski Zaliv, Trst), Istra, Adriatic Sea, Italy | 1147 
  map | Aug 1876 |  |  |  |  | only one specimen. | Graff Lvon (1882): 414 | 
| C | Harbor of Messina, Sicily (Sicilia, Sicile, Sizilien, Sicula)), Italy | 241 
  map | Aug 1876 |  |  |  |  | frequently found in Ulven (Ulva). | Graff Lvon (1882): 414 | 
| D | Costinesti, Romania, Black Sea | 2582 
  map | prior to 1974 |  | 0.2-0.3 |  |  | 'littoral basins', among Cladophora. | Mack-Fira V (1974): 253 | 
| E | Agigea, Romania, Black Sea | 2337 
  map | prior to 1974 |  | 1.0 m | stone zone |  | Numerous specimens, stone zone, among algae. | Mack-Fira V (1974): 253 | 
| F | Costinesti, Romania, Black Sea | 2582 
  map | prior to 1974 |  | 1.0 m | stone zone |  | Numerous specimens, stone zone, among algae. | Mack-Fira V (1974): 253 | 
| G | Vama Veche (Ilanlik Ilanlac Ilanlic), Romania, Black Sea | 2584 
  map | prior to 1974 |  | 1.0 m | stone zone |  | Numerous specimens, stone zone, among algae. | Mack-Fira V (1974): 253 | 
| H | Sevastopol (Sebastopol, Sewastopol, Akhiar, Akhtyar), Black Sea, Ukraine. | 203 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| I | Sebastopol (Sewastopol), Black Sea, Saint George Monastery (Kloster, St. Georgskloster, St. Georgsikloster), Ukraine | 202 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| J | Lesina, Italy | 263 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| K | Ancona, Italy | 265 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| L | Barcola (Barkovlje), Italy | 2749 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| M | Gulf of Trieste (Trzaski Zaliv, Trscanski Zaliv, Trst), Istra, Adriatic Sea, Italy | 1147 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| N | Villefranche Sur Mer (French Riviera), France | 259 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| O | Harbor of Messina, Sicily (Sicilia, Sicile, Sizilien, Sicula)), Italy | 241 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| P | Le Portel (Portel, Marine Lab), Nord Pas de Calais, Channel | 291 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| Q | Helgoland Islands (Helgoland Insel, Heligoland), Germany | 636 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| R | Concarneau, France | 252 
  map | 1913 or earlier |  |  |  |  |  | Graff Lvon (1913): 399 | 
| S | Irish Sea (Port Erin) | 250 
  map | 1893 or earlier |  |  |  |  | among algae. | Graff Lvon (1913): 400 | 
| T | Plymouth, England (English Channel) | 255 
  map | 1893 or earlier |  |  |  |  | among algae. | Graff Lvon (1913): 400 | 
| U | Wimereux, Channel | 290 
  map | 1893 or earlier |  |  |  |  | among algae. | Graff Lvon (1913): 400 | 
| V | Le Portel (Portel, Marine Lab), Nord Pas de Calais, Channel | 291 
  map | 1893 or earlier |  |  |  |  | among algae. | Graff Lvon (1913): 400 | 
| W | Sevastopol (Sebastopol, Sewastopol, Akhiar, Akhtyar), Black Sea, Ukraine. | 203 
  map | 1892 or earlier | type locality |  |  |  |  | Pereyaslawzewa S (1892): ; from Graff (citation)- p. 400 | 
| X | Marine Biological Station, outside Espegrend, Bergen, Hordaland, Norway | 534 
  map | Aug 8, 1951 |  | 5 m | mud, shell |  | near Notatangen, with seaweed fragments. | Westblad E (1955): 495 | 
| Y | Cawsand Bay, near Plymouth, England | 1337 
  map | Jul 5, 1949 |  | 16 m | fine sand, seaweed |  |  | Westblad E (1955): 495-96 | 
| Z | New Ground, near Plymouth, United Kingdom | 1336 
  map | Jul 22, 1949 |  | 14 m | shell gravel, seaweed |  |  | Westblad E (1955): 495-96 | 
| A1 | Rovigno (Rovigno d'Istria, Rovinj), Croatia | 1146 
  map | 1933 or earlier |  |  |  |  | few specimens.  in Ulven at the Station. | Steinböck O (1933): 18 | 
| B1 | Herdla (Herlo), off  Bergen, Norway | 56 
  map | 1940 or earlier |  |  |  |  | from algae. | Karling TG (1940): 13 | 
| C1 | Wembury Bay, United Kingdom | 1329 
  map | Aug-Sep 1892 |  |  |  |  | In dredgings taken from the Duke Rock, Millbay Channel, and Hamoaze. | Gamble FW (1893): 32, 44 | 
| D1 | Hamoaze estuary, United Kingdom | 1333 
  map | Aug-Sep 1892 |  |  |  |  |  | Gamble FW (1893): 44 | 
| E1 | tide pools, Wembury Bay, United Kingdom | 4964 
  map | Aug-Sep 1892 |  |  |  |  | Tow-netting in the narrow creeks that run in between the rocks produced young specimens of Leptoplana tremellaris, Convoluta paradoxa, Plagiostoma vittatum, and Cylindrostoma inerme. | Gamble FW (1893): 32-33 | 
| F1 | New Grounds, Plymouth Sound, United Kingdom | 4966 
  map | Aug-Sep 1892 |  |  |  |  | New Grounds, north of the west entrance to the [Plymouth] Sound. | Gamble FW (1893): 35 | 
| G1 | Duke Rock, Plymouth Sound, United Kingdom | 4967 
  map | Aug-Sep 1892 |  |  |  |  | Duke Rock, situated in 7 fathoms at the east entrance of the Sound, forms one of a number of dredging-grounds inside the Sound..  In dredgings. | Gamble FW (1893): 35-36, 44 | 
| H1 | Hamoaze estuary, United Kingdom | 1333 
  map | Aug-Sep 1892 |  |  |  |  | The Hamoaze.  Stones and debris covered with mud-tubes of Polydora caeca, tenanted, however, by an Amphipod, Corophium Bonellii.  In dredgings. | Gamble FW (1893): 37, 44 | 
| I1 | Millbay Channel, Plymouth Sound, Plymouth, United Kingdom | 4970 
  map | Aug-Sep 1882 |  |  |  |  | In dredgings. | Gamble FW (1893): 44 | 
| J1 | Helgoland, Germany | 4234 
  map | Sep-Oct 1894 |  |  |  |  |  | Attems CG (1897): 229 | 
| K1 | Berria Beach near Santona, Spain | 6232 
  map | 1997-1999 |  |  |  | Euhaline |  | Noreña C, Damborenea C, Faubel A & Brusa F (2007): 1992, 1993 |