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 crystallina Smriglio, Gubbioli & Mariottini, 2000 Figs 1 , 2E Granulina crystallina Smriglio, Gubbioli & Mariottini, 2000: 55 , 58, figs 3, 13–16; type locality off Mauritania ( 80–90 m ). Smriglio et al . (2000) reported 22 specimens , of which some empty shells from off Mauritania ( 80–90 m ) without further details. The holotype was deposited in the Bologna Zoology Museum (MZB14031). Twenty-one paratypes were retained in private collections. Material examined (48 shells) MAURITANIA – off Banc d’Arguin • 11 shells ; 20.3667° N , 17.6667° W ; depth 200 m ; 28 Oct. 1978 ; CANCAP stn 3.120; sandy clay with shells ; van Veen grab ; SaM • 3 shells ; 18.9833° N , 16.8333° W ; depth 203 m ; 30 Oct. 1978 ; CANCAP stn 3.140; sandy clay with shells ; van Veen grab ; RMNH.MOL.351807 • 7 shells ; Arguin mud wedge ; 20.4569° N , 17.6795° W ; depth 142 m ; 24 Oct. 2010 ; MSM16 –3 stn GeoB14706; box core in muddy silt; SaM ; box core in muddy silt; SaM • 1 shell; 19.94° N , 17.48° W ; depth 151 m ; 22 May 1988 ; Tyro Mauritania I stn B5; RMNH .MOL.351808. – off Nouakchott • 1 shell; off Nouakchott ; 17.0967° N , 16.73° W ; depth 127 m ; 17 Feb. 1977 ; M44 stn 193–KG626; box core; SMF • 3 shells ; 17.045° N , 16.7783° W ; depth 199 m ; 11 Feb. 1977 ; M44 stn 133–KG616; box core; SMF . WESTERN SAHARA – off Cap Blanc • 22 shells ; 21.325° N , 17.37° W ; depth 81 m ; 25 Feb. 1977 ; M44 stn 235–KG649; box core; SMF . Remarks Smriglio et al . (2000) indicated a holotype height of 2.4 mm ; our set indicates a maximum height of 3.1 mm . The species is a largest member of the four coffin-shaped species from Mauritania . It has weak labial denticles, a clear angular outline and it shows a weak (ab-)apical rostration. The species is known from empty shells in the latitudinal range 17.0– 21.4° N . It is commonly found on the lower shelf at depths of 52–210 m in silty sand.