Crisilla semistriata ( Montagu, 1808 )

Oliver, Joan Daniel, Gofas, Serge, Urgorri, Victoriano, Díaz-Agras, Guillermo & Templado, José, 2022, Rissoidae gastropods of the outer continental shelf and slope off Galicia (NW Spain), Zootaxa 5196 (1), pp. 1-45 : 35

Crisilla semistriata ( Montagu, 1808)

( Fig. 21e )

Material examined. (2 empty shells and 2 with soft parts, in 3 samples): SPAIN • 1 sPc (juv); 43° 40.250′N, 008° 43.755′W to 43° 40.760′N, 008° 42.120′W; 207– 197 m; 10–20 SeP. 2003; DIVA-Artabria I EBS-200 • 1 sPc (juv) + 1 sh; 42° 30.391′N, 009° 19.517′W to 42° 29.428′N, 009° 17.924′W; 147–148 m; 17–28 SeP. 2004; VERTIDOS AG-EBS-150 • 1 sh; 44° 00.806′N, 008° 33.098′W to 44° 01.967′N, 008° 32.57′W; 346– 344 m; 15–24 Jul. 2008; A SELVA EBS-14 .

Remarks. It is a very common sublittoral species, mainly in shallow waters, along all European and North African coasts from Norway to Morocco and throughout the Mediterranean, not present on the Macaronesian islands ( Oliver et al. 2019). Very few eroded shells ( Fig. 21e ) have been found in samples obtained at the depth range of 150–345 m, likely swept by the currents away from the coast.

Figures

FIGURE 21. Pusillina cf. radiata (Philippi, 1836). a–b Juvenile eroded shells (a: 1.6 mm; b: 1.7 mm) (SE:DRN-7); c Protoconch (VE:GA-AT-800); d Alvania cancellata (Da Costa, 1778) (0.96 mm) (VE:AG-EBS-150); e Crisilla semistriata (Montagu, 1808) (1.9 mm) (SE-08:EBS14); f Onoba semicostata (Montagu, 1803) (1.7 mm) (SA:SARRI-3); g Manzonia crassa (Kanmacher, 1798) (2.1 mm) (SE:DRN7).