Granulina crystallina Smriglio, Gubbioli & Mariottini, 2000

Granulina crystallina Smriglio, Gubbioli & Mariottini, 2000 View in CoL

Figs 1 View Fig , 2E View Fig

Granulina crystallina Smriglio, Gubbioli & Mariottini, 2000: 55 View in CoL , 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 GoogleMaps • 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 GoogleMaps • 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 GoogleMaps • 1 shell; 19.94° N, 17.48° W; depth 151 m; 22 May 1988; Tyro Mauritania I stn B5; RMNH.MOL.351808. GoogleMaps – 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 GoogleMaps • 3 shells; 17.045° N, 16.7783° W; depth 199 m; 11 Feb. 1977; M44 stn 133–KG616; box core; SMF GoogleMaps .

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 GoogleMaps .

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.