Tholoarctus natans n. g., n. sp. (Kristensen & Renaud-Mornant 1983)
Tholoarctus natans Kristensen & Renaud-Mornant, 1983 (D’Addabbo Gallo et al. 1989) Tholoarctus natans Kristensen and Renaud-Mornant, 1983 (Kristensen & Neuhaus 1999, Boesgaard & Kristensen 2001, Hansen et al. 2001, Grimaldi de Zio et al. 2003, Hansen & Kristensen 2006) Terra typica: Celtic Sea (France, Europe)
Adriatic Sea:
• 42 °09′00′′N, 15 ° 30 ′00′′E [42 °08′N, 15 ° 31 ′E]; 11–38 m bsl: [FAO 37] Italy, Foggia Province, Tremiti Islands, Caprara [Capraia] Island, Cala dei Turchi, coarse organogenic detritus. Grimaldi de Zio & D’Addabbo Gallo (2001), Grimaldi de Zio et al. (2003)
• 42 °06′N, 15 ° 29 ′E; 11–20 m bsl: [FAO 37] Italy, Foggia Province, Tremiti Islands, San Domino Island, Punta del Diavolo, coarse organogenic detritus. Grimaldi de Zio & D’Addabbo Gallo (2001), Grimaldi de Zio et al. (2003)
• 40 ° 34.38 ′N, 18 ° 0 9.49 ′E ; 10 m bsl: [FAO 37] Italy, Brindisi Province, Mattarelle [Torre Mattarelle], ENEL power station, coarse sand. Accogli et al. (2011)
Arabian Sea:
• 28 °02′N, 48 ° 40 ′E; 0.46–1.07 m above ISLW (Indian Spring Low Water) / 0 m bsl: [FAO 51] Saudi Arabia, Eastern Region, Persian Gulf, N of Safaniya, intertidal. Hansen & Kristensen (2006)
Atlantic Ocean:
• 61 ° 17.88 ′N, 08° 32.22 ′W / 61 ° 18 ′N, 08° 32 ′W; 249 m bsl: [FAO 27] Faroe Islands, edge of Faroe Bank, BIOFAR station 785, carbonate sand and basalt pebbles. Kristensen & Neuhaus (1999)
• 61 ° 17 ′ 42 ′′N, 08° 32 ′ 18 ′′W; 104–260 m bsl: [FAO 27] Faroe Islands, Faroe Bank, shell gravel, coarse shell gravel, carbonate fine sand, carbonate sand, or fine shell sand. Hansen et al. (2001)
• 48 °01′N, 05° 44 ′W; 130 m bsl: [FAO 27] France, Brittany Region, continental shelf, near Brest, shelly sand. Kristensen & Renaud-Mornant (1983)
• 47 ° 38.3 ′N, 08°06.3′W / 47 ° 38 ′N, 08°06′W; 1369 m bsl: [FAO 27] France, Bay of Biscay. Kristensen & Renaud-Mornant (1983)
• 47 ° 31 ′N, 08° 41 ′W; 2087 m bsl: [FAO 27] France, Bay of Biscay. Kristensen & Renaud-Mornant (1983)
• 37 ° 13 ′N, 28 ° 44 ′W [37 ° 43 ′N, 28 ° 46 ′W]; 340 m bsl: [FAO 27] Portugal, Azores. Kristensen & Renaud- Mornant (1983)
• 34 °07.3′N, 75 ° 57.7 ′W / 34 °07′N, 75 ° 58 ′W; 400 m bsl: [FAO 31] USA, North Carolina State, surface, fine sand with 17 % clay. Kristensen & Renaud-Mornant (1983)
Balearic Sea:
• 40 ° 20 ′N, 08° 22 ′E; 20 m bsl: [FAO 37] Italy, Sardinia, Sassari or Oristano Province, Gulf of Alghero, medium sand. D’Addabbo Gallo et al. (2007)
Celtic Sea:
• 48 ° 43 ′N, 03° 54 ′ 10 ′′W; 25–30 m bsl: [FAO 27] Type Locality: France, Brittany Region, near Roscoff, upper surface of shelly sand of the scaphopod Dentalium. Kristensen & Renaud-Mornant (1983)
• 48 ° 42.6 ′N, 03° 53.8 ′W / 48 ° 43 ′N, 03° 54 ′W; 20 m bsl: [FAO 27] France, Brittany Region, Roscoff, Pierre Noire, fine sand. Kristensen & Renaud-Mornant (1983)