New records of demosponges (Porifera) from the South Orkney Islands (Antarctica) with a checklist for the region Author Schejter, Laura Author Cristobo, Javier Author Ríos, Pilar text Zootaxa 2024 2024-01-23 5403 4 401 430 http://dx.doi.org/10.11646/zootaxa.5403.4.1 journal article 10.11646/zootaxa.5403.4.1 1175-5326 10562154 C2EAB19C-07CB-4013-9C93-D25259EA2673 Artemisina apollinis ( Ridley & Dendy, 1886 ) ( Fig 3a–e ) Restricted synonymy: Amphilectus apollinis Ridley & Dendy, 1886 ; Artemisina dianae Topsent, 1907 . Material examined: 4 specimens collected in stations 1 ( SOI ; 60°28'S , 46°29'W ; 139 m ; 19/2/2014 ; MACN-In 44357; IEO-CSIC Col.), 4 ( SOI ; 60°55'S , 44°04'W ; 256 m ; 2/3/2014 ; MACN-In 44358) and 18 ( SOI ; 60°47,561'S , 45°36,854'W ; 96 m ; 10/3/2012 ; MACN-In 44356; IEO-CSIC Col.) . Description: Massive slightly digitate specimen, cavernous in aspect, brown colour ( Figure 3a ). Spicules are: megascleres: thick styles of 530–700 µm by 10–40 µm and long and thin ectosomal styles of 450–520 µm by 5 µm; microscleres: toxas with spined ends 480–640 µm and small isochelae 15–20 µm ( Figure 3b–e ). Remarks: This species was previously recorded in Antarctic and subantarctic waters by Topsent (1908) , Koltun (1964) , Ríos et al. (2004) , Ríos (2006) , Fernández et al. (2021) , among others. This represents the first record for the SOI.