Rissoidae gastropods of the outer continental shelf and slope off Galicia (NW Spain) Author Oliver, Joan Daniel Alcorisa 83 - 12 C, 28043 Madrid, Spain. joandanieloliver @ hotmail. com Author Gofas, Serge Departamento de Biología Animal, Universidad de Málaga, E- 29071 Málaga, Spain. Author Urgorri, Victoriano Estación de Bioloxía Mariña da Graña, REBUSC, Universidade de Santiago de Compostela, Spain. Author Díaz-Agras, Guillermo Estación de Bioloxía Mariña da Graña, REBUSC, Universidade de Santiago de Compostela, Spain. Author Templado, José Museo Nacional de Ciencias Naturales (CSIC), José Gutiérrez Abascal 2, 28006 Madrid, Spain. text Zootaxa 2022 2022-10-18 5196 1 1 45 journal article 170600 10.11646/zootaxa.5196.1.1 e1042177-7e89-413a-b10b-3803d000d20d 1175-5326 7224080 1B12892E-D68F-4BFE-8E9A-7F19E220E73D Obtusella macilenta ( Monterosato, 1880 ) ( Fig. 19 ) Material examined. (more than 2000 shells, most of them with soft parts, in 25 samples): SPAIN • 1 sPc; 43° 57.030′N , 008° 54.795′W to 43° 57.248′N, 008° 54.133′W; 1191– 1132 m ; 08–15 SeP. 2002 ; DIVA-Artabria I AT-1000 • 250 spc + 100 sh; 43° 35.451′N , 008° 34.432′W to 43° 34.810′N, 008° 35.407′W; 153– 151 m ; 08–15 SeP. 2002 ; DIVA-Artabria I EBS-150 • 10 sPc + 7 sh; 43° 40.192′N , 008° 43.760′W to 43° 40.943′N, 008° 42.366′W; 207–212 m ; 08–15 Sep. 2002 ; DIVA-Artabria I EBS-200 • 4 sPc + 2 sh; 43° 41.113′N , 008° 44.297′W to 43° 41.905′N, 008° 43.078′W; 256–258 m ; 08–15 Sep. 2002 ; DIVA-Artabria I EBS-250 • 5 sPc + 1 sh; 43° 41.689′N , 008° 45.195′W to 43° 42.556′N, 008° 44.226′W; 298–303 m ; 08–15 SeP. 2002 ; DIVA-Artabria I EBS-300 • 2 sPc; 43° 42.348′N , 008° 45.889′W to 43° 43.269′N, 008° 45.289′W; 344–354 m ; 10–20 SeP. 2003 ; DIVA-Artabria I EBS-350 • 1 sPc; 43° 45.892′N , 008° 44.301′W to 43° 46.966′N, 008° 43.766′W; 390– 381 m ; 08–15 SeP. 2002 ; DIVA-Artabria I EBS-400 • > 300 spc + 100 sh; 43° 26.703′N , 008° 30.669′W to 43° 27.452′N, 008° 29.612′W; 103– 102 m ; 10–20 SeP. 2003 ; DIVA-Artabria I EBS-100 • > 200 sPc + 100 sh; 43° 35.451′N , 008° 34.432′W to 43° 34.810′N, 008° 35.407′W; 153– 151 m ; 08–15 Sep. 2002 ; DIVA-Artabria I EBS-150 • 15 sPc + 2 sh; 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 • 9 sPc + 4 sh; 43° 41.590′N , 008° 45.328′W to 43° 42.396′N, 008° 44.286′W; 301– 301 m ; 10–20 SeP. 2003 ; DIVA-Artabria I EBS-300 • 2 sPc; 43° 42.348′N , 008° 45.889′W to 43° 43.269′N, 008° 45.289′W; 344–354 m ; 10–20 SeP. 2003 ; DIVA-Artabria I EBS-350 • 3 sh; 43° 48.587′N , 008° 51.402′W to 43° 49.545′N, 008° 51.197′W; 610– 598 m ; 10–20 SeP. 2003 ; DIVA-Artabria I EBS-600 • 15 sh; 43° 29.412′N , 008° 28.362′W to 43° 29.779′N, 008° 28.240′W; 110–111 m ; 17–28 SeP. 2004 ; VERTIDOS GA-AT-110 • 4 sPc; 43° 32.026′N , 008° 37.520′W to 43° 32.806′N, 008° 35.993′W; 150–151 m ; 17–28 SeP. 2004 ; VERTIDOS GA-AT-150 • 25 sPc + 10 sh; 43° 31.970′N , 008° 37.670′W to 43° 32.697′N, 008° 3.171′W; 151– 151 m ; 17–28 SeP. 2004 ; VERTIDOS GA-EBS-150 • 5 sPc + 4 sh; 43° 36.222′N , 008° 52.845′W to 43° 36.797′N, 008° 52.112′W; 201– 201 m ; 17–28 Sep. 2004 ; VERTIDOS GA-EBS-200 • 2 spc; 43° 35.611′N , 008° 58.536′W to 43° 36.104′N, 008° 57.284′W; 384– 345 m ; 17–28 Sep. 2004 ; VERTIDOS GA-EBS-400 • > 100 sPc; 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 • 80 sPc; 42° 31.176′N , 009° 23.380′W to 42° 32.132′N, 009° 24.151′W; 242–248 m ; 17–28 SeP. 2004 ; VERTIDOS AG-EBS-250 • >600 sPc; 42° 50.507′N , 009° 25.773′W to 42° 48.810′N, 009° 25.198′W; 151– 148 m ; 17–28 SeP. 2004 ; VERTIDOS CA-EBS-150 • >100 spc; 42° 15.780′N , 009° 10.500′W to 42° 17.100′N, 009° 10.630′W; 149–150 m ; 17–28 SeP. 2004 ; VERTIDOS CH-EBS-150 • 1 sh; Polygon delimited by Points 44° 10.000′ N , 009° 00.000′ W /44° 10.000′ N, 008° 35.000′ W/44° 00.000′ N; 009° 00.000′ W/44° 07.000′ N; 008° 35.000′ W; 480–600 m ; SARRIDAL (2006–2007) SARRI-2 • 1 sh; 43° 31.727′N , 008° 52.374′W to 43° 32.678′N, 008° 52.687′W; 173–179 m ; 15–24 Jul. 2008 ; A SELVA DRN-23 • 53 spc; 43° 31.687′N , 008° 52.188′W to 43° 33.149′N, 008° 53.142′W; 171–182 m ; 15–24 Jul. 2008 ; A SELVA EBS-23 • 4 spc; 43° 48.252′N , 008° 51.427′W to 43° 49.707′N, 008° 51.164′W; 575–584 m ; 15-24 Jul. 2008 ; A SELVA EBS-30-1 . Remarks. Obtusella macilenta is known from the continental shelf and slope from the southern part of the Biscay Bay to off Morocco and the Mediterranean ( Gofas & Oliver 2011 ). It was the most abundant species in studied samples, along with A. testae , predominantly between 100 and 250 m on muddy sand bottoms, although one shell with soft parts was found in a sample collected at 1132 m in depth. It is even smaller than the previous species; the shells studied barely reach 1 mm and are less globose with weakest spiral sculpture ( Figs. 19a–b ). Sinuous protoconch/teleoconch transition ( Figs. 18c–e ) and embryonic shell with up to four delicate spires ( Figs. 18f–g ).