Revision of deep-water species in Granulina (Gastropoda: Granulinidae) from Mauritania and Western Sahara Author Elm, Laura-Marie Von 9FB99C0B-AA0A-4AA8-8465-1EAFCC65B366 Thüringerstrasse 3, 26180 Rastede, Germany. laura-marievonelm@kabelmail.de Author Hoffman, Leon E2B27F54-29C5-46AA-9437-ABA84D54DDF3 Senckenberg am Meer, Südstrand 40, 26382 Wilhelmshaven, Germany. leon.hoffman@senckenberg.de text European Journal of Taxonomy 2024 2024-03-18 925 268 291 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2467/10969 journal article 10.5852/ejt.2024.925.2467 2118-9773 10837829 B09375C0-6E28-4E2D-BB7C-26E1753171E2 Granulina cerea Smriglio, Gubbioli & Mariottini, 2000 Figs 1 , 2A–D Granulina cerea Smriglio, Gubbioli & Mariottini, 2000: 54–55 , figs 1, 5–8; type locality: off Mauritania . The holotype was deposited in the Bologna Zoology Museum (MZB14033). Smriglio et al . (2000) reported four shells from off Mauritania without further location details. Three paratypes were retained in private collections. Material examined (388 shells) MAURITANIA – off Banc d’Arguin • 5 shells ; 18.9833° N , 16.8333° W ; depth 203 m ; 30 Oct. 1978 ; CANCAP stn 3.140; sandy clay with shells by van Veen grab ; RMNH.MOL.351801 • 9 shells ; 19.35° N , 16.9333° W ; depth 200 m ; 31 Oct. 1978 ; CANCAP III stn 3.154; sandy clay with shells; van Veen grab ; RMNH.MOL.351802 • 89 shells ; 19.94° N , 17.48° W ; depth 85–151 m ; 22 May 1988 ; Tyro Mauritania I stn B5; dredge; SaM • 4 shells ; Arguin mud wedge; 20.2353° N , 17.6029° W ; depth 111 m ; 24 Oct. 2010 ; MSM16-3 stn GeoB14703; box core in muddy silt; SaM • 1 shell ; Baie du Levrier ; 20.8801° N , 16.9922° W ; depth 14 m ; 31 Oct. 2010 ; MSM16–3 stn GeoB14782; box core in muddy silt; SaM • 4 shells ; Arguin South 3 Canyon ; 19.7381° N , 17.1465° W ; depth 483 m ; 7 Nov. 2010 ; MSM16–3 stn GeoB14858; bottom grab; SaM . – Timiris Mud wedge • 1 shell ; 19.5117° N , 16.8618° W ; depth 52 m ; 8 Nov. 2010 ; MSM16–3 stn GeoB14865; box core in muddy silt; SaM • 2 shells ; 19.5506° N , 16.9731° W ; depth 100 m ; 8 Nov. 2010 ; MSM16–3 stn GeoB14866; box core in silty sand; SaM . – off Nouakchott ; SMF • 61 shells ; 17.045° N , 16.7783° W ; depth 202 m ; 11 Feb. 1977 ; M44 stn 133–KG613; box core; SMF • 43 shells ; 17.045° N , 16.7783° W ; depth 208 m ; 11 Feb. 1977 ; M44 stn 133–KG615; box core; SMF • 108 shells ; 17.045° N , 16.7783° W ; depth 199 m ; 11 Feb. 1977 ; M44 stn 133–KG616; box core; SMF • 46 shells ; 17.0967° N , 16.73° W ; depth 127 m ; 11 Feb. 1977 ; M44 stn 193–KG626; box core; SMF • 3 shells ; 17.0967° N , 16.73° W ; depth 126 m ; 11 Feb. 1977 ; M44 stn 193–KG627; box core; SMF • 2 shells ; 17.0967° N , 16.73° W ; depth 124 m ; 17 Feb. 1977 ; M44 stn 193–KG629; box core; SMF . WESTERN SAHARA – North of Dakhla • 2 shells ; 25.1833° N , 15.8033° W ; depth 87 m ; M36 stn 95–KG6; 22 Feb. 1975 ; box core; SMF . Remarks Smriglio et al . (2000) indicated a shell height of 2.3 mm ; the shells in our material show a height range for adult shells of 2.3–2.8 mm . The species is a member of the four coffin-shaped species from Mauritania . It has weak labial denticles, an angular outline and it lacks an (ab-)apical rostration. All species reported by Smriglio et al . (2000) as well as all other NE Atlantic and Mediterranean species investigated in this study show a micro-sculpture (ab-)apically, near the columellar folds, the parietal area and the outer lip. Smriglio et al . (2000) stated that his specimens did not show any micro-sculpture, even at high magnification using a SEM. We note that the outline of a micro-sculpture is visible in some of their SEM images and colour photographs. The species is known from empty shells in the latitudinal range between 17.0° N and 25.2° N . The full bathymetric range is 14–483 m ; it is commonly found on the lower shelf at depths of 80–210 m in silty sand. Gofas (1992 : fig. 14) shows a small (height 2.15 mm ) specimen from a depth of 50 m off Gorée Island ( Senegal ) under the name Granulina sp. which could belong to G. cerea . If confirmed, then this would extend the southern distribution range significantly.