Granulina, Jousseaume, 1888

Elm, Laura-Marie Von & Hoffman, Leon, 2024, Revision of deep-water species in Granulina (Gastropoda: Granulinidae) from Mauritania and Western Sahara, European Journal of Taxonomy 925, pp. 268-291 : 287

Key to Mauritanian species in Granulina

This key is for small (<5 mm) ovoid convolved shell with an internal protoconch.

1. Shells with denticles on inside external lip........................................................................................ 2

– Without labial denticles ..................................................................................................................... 6

2. Shell very small (height <2.1 mm) ................................................................................................... 3

– Shell larger (height> 2.1 mm)........................................................................................................... 4

3. Broad triangular-rounded outline........................................................... G. mauretanica Gofas, 1992

– Oval outline .................................................................................................................... G. aff. crassa

– Angular elongated (coffin)...................................... G. crassa Smriglio, Gubbioli & Mariottini, 2000

4. Oval outline, even labial denticles...................... G. nofronii Smriglio, Gubbioli & Mariottini, 2000

– Angular (coffin) outline ..................................................................................................................... 5

5. Weak rostration (ab-)apically........................... G. crystallina Smriglio, Gubbioli & Mariottini, 2000

– No rostration ............................................................ G. cerea Smriglio, Gubbioli & Mariottini, 2000

6. Wide open apical channel ...................................................................................... G. reginae sp. nov.

– Apical channel curved and narrow .................................................................................................... 7

7. Broad outline (width/height 0.69) with weakly pointed apex .............................. G. sandrae sp. nov.

– Elongated outline (width/height less than 0.6) .................................................................................. 8

8. Rounded apically, thin lip, coalescent upper columellar teeth ............................ G. sigridae sp. nov.

– Tapered (ab-)apically, thicker lip, separate columellar teeth ................................ G. ronaldi sp. nov.