Granulina crassa Smriglio, Gubbioli & Mariottini 2000
Creators: name: Elm, Laura-Marie Von
name: Hoffman, Leon
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Granulinidae
Granulina
Granulina crassa

description: Granulina crassa Smriglio, Gubbioli & Mariottini, 2000
Figs 1, 3
Granulina crassa Smriglio, Gubbioli & Mariottini, 2000: 55, figs 2, 9–12; type locality: off Mauritania, 80– 100 m.
Smriglio et al. (2000) reported 14 type specimens, of which some empty shells from off Mauritania (80– 100 m) and off Western Sahara (50 m) without further details. The holotype was deposited in Bologna Zoology Museum (MZB14030). Thirteen paratypes were retained in private collections.
Material examined (509 shells)
MAURITANIA – Banc d’Arguin • 5 shells; 20.3667° N, 17.6667° W; depth 200 m; 28 Oct. 1978; CANCAP stn 3.120; sandy clay with shells; van Veen grab; RMNH.MOL.351803 • 12 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.351804 • 3 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.351805 • 28 shells; 19.35° N, 16.9333° W; depth 200 m; 31 Oct. 1978; CANCAP stn 3.154; sandy clay with shells; van Veen grab; RMNH.MOL.351806 • 60 shells; 19.94° N, 17.48° W; depth 151 m; 22 May 1988; Tyro Mauritania I stn B5; SaM • 2 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 • 40 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 • 1 shell; Baie du Levrier; 20.8169° N, 17.0186° W; depth 13 m; 31 Oct. 2010; MSM16– 3 stn GeoB14780; bottom grab in muddy silt; SaM • 1 shell; southern Banc d'Arguin; 19.7967° N, 17.2034° W; depth 105 m; 6 Nov. 2010; MSM16–3 stn GeoB14850; box core in muddy silt; SaM. – Timiris mud wedge • 2 shells; 19.5506° N, 16.9731° W; depth 100 m; 8 Nov. 2010; MSM16– 3 stn GeoB14866; box core in silty sand; SaM. – Banda Mound Complex • 1 shell; 17.6699° N, 16.6736° W; depth 505 m; 14 Nov. 2010; MSM16–3 stn GeoB14898; bottom grab in muddy silt; SaM. – off Nouakchott • 3 shells; 17.045° N, 16.7783° W; depth 202 m; 11 Feb. 1977; M44 stn 133–KG613; box core; SMF • 5 shells; 17.045° N, 16.7783° W; depth 208 m; 11 Feb. 1977; M44 stn 133–KG615; box core; SMF • 1 shell; 17.0817° N, 16.775° W; depth 312 m; 12 Feb. 1977; M44 stn 135–KG625; box core; SMF • 25 shells; 17.0967° N, 16.73° W; depth 127 m; 17 Feb. 1977; M44 stn 193–KG626; box core; SMF • 5 shells; 17.0967° N, 16.73° W; depth 126 m; 17 Feb. 1977; M44 stn 193–KG627; box core; SMF • 72 shells; off Nouakchott; 17.2783° N, 16.4483° W; depth 87 m; 13 Feb. 1982; M60 stn 77–KG960; box core; SMF • 85 shells; 17.2783° N, 16.4483° W; depth 88 m; 13 Feb. 1982; M60 stn 77–KG961; box core; SMF • 55 shells; 17.2783° N, 16.4483° W; depth 87 m; 13 Feb. 1982; M60 stn 77–KG965; box core; SMF.
WESTERN SAHARA – off Cap Blanc • 62 shells; 21.325° N, 17.37° W; depth 81 m; 25 Feb. 1977; M44 stn 235–KG649; box core; SMF • 1 shell; 21.7683° N, 17.4333° W; depth 125 m; 20 Feb. 1982; M60 stn 88–KAD268; SMF. – North of Dakhla • 39 shells; 25.0000° N, 15.5167° W; depth 53 m; 21 Feb. 1975; M36 stn 94–KG2; box core; SMF • 1 shell; 25.18333° N; 15.80333° W; depth 87 m; 22 Feb. 1975; M36 stn 95–KG6; box core; SMF.
Remarks
Smriglio et al. (2000) indicated a holotype height of 1.9 mm; our set indicates a maximum height of 2.1 mm. The species is the smallest member of the four coffin-shaped species from Mauritania. It has very weak labial denticles that occasionally may be absent, even though these specimens may be subadult. Granulina crassa lacks an (ab-)apical rostration.
The species is known from empty shells in the latitudinal range 17.0– 25.2° N. The full bathymetric range is 13–505 m; it is commonly found on the lower shelf at depths of 80–210 m in silty sand.
description: Published as part of Elm, Laura-Marie Von & Hoffman, Leon, 2024, Revision of deep-water species in Granulina (Gastropoda: Granulinidae) from Mauritania and Western Sahara, pp. 268-291 in European Journal of Taxonomy 925 on pages 271-274, DOI: 10.5852/ejt.2024.925.2467, http://zenodo.org/record/10837829