Lissodendoryx (Ectyodoryx) anacantha (Hentschel, 1914) (Figure 4j–o) Restricted synonymy: Ectyodoryx frondosa var. anacantha Hentschel, 1914, Ectyodoryx anacantha Hentschel, 1914. Material examined: 1 specimen collected at station 7 (SOI; 61°00'S, 46°44'W; 609 m; 3/3/2014; MACN-In 44386; IEO-CSIC Col.). Description: Specimen erect, massive, beige in colour, with a conulose surface (Figure 4j). In the choanosomal skeleton, the principal acanthostyles are disposed in multispicular axes. Spicules are acanthostyles I, spined only at their tips, of 470–660 µm by 30 µm; acanthostyles II completely spined 210–320 µm by 10–15 µm; strongyles also spined at their tips of 230–300 µm by 7.5 µm, arcuate isochelae, 25 µm with curved alae and two categories of sigmas of 50–55 µm and 20–25 µm (Figure 4k–o). Remarks: This species is distributed in the Antarctic domain. It was previously recorded by Hentschel (1914) at the East Antarctic Wilkes Land (type locality) and at Kermadec Island, at Palmer Archipelago (Antarctic Peninsula) by Burton (1932), at the South Shetland Is. and East Antarctic Wilkes Land by Koltun (1964) and Ríos (2006). This is the first report for the SOI.

Published as part of Schejter, Laura, Cristobo, Javier & Ríos, Pilar, 2024, New records of demosponges (Porifera) from the South Orkney Islands (Antarctica) with a checklist for the region, pp. 401-430 in Zootaxa 5403 (4) on page 411, DOI: 10.11646/zootaxa.5403.4.1, http://zenodo.org/record/10562154