dc:description"Fig. 2. In-situ image of Asthenactis agni n. sp. Holotype, NSMT E-13917, taken at the An’ei Seamount, Japan (29°17′47.784″N, 138°40′42.714″E), at a depth of 1970m.";
dc:description"Fig. 3. Abactinal views of Asthenactis agni n. sp. Holotype, NSMT E-13917. A, Whole body; B, denuded abactinal surface at proximal part of arm; C, denuded abactinal surface at middle part of arm; D, denuded abactinal surface at the center of the disc; E, abactinal surface at proximal part of arm; F, abactinal surface at middle part of arm. Abbreviations: abp, abactinal plates; abs, abactinal spines; an, anus; fa, fascicles of abactinal spines; r, primary radial plates. Scale bars indicate 10mm in A and 1mm in B–F.Proximal is left in B, C, E, and F.";
dc:description"Fig. 4. Actinal views of Asthenactis agni n. sp. Holotype, NSMT E-13917. A, Whole body; B, denuded actinal surface at the proximal part of arm; C, actinal surface of the 1st to 4th adambulacral plates; D, actinal surface of the 5th to 6th adambulacral plates, showing an aperture (arrowhead) of an actinolateral membrane. Tips of furrow spines on 5th adambulacal plate shown as the white dotted line were removed; E, actinal surface of oral plates and 1st to 2nd adambulacral plates; F, actinal surface of ambulacral groove. Abbreviations: a, abradial-most actinolateral spine; ad, adambulacral plates; f, furrow spines; or, oral plates; os, oral spines; t, tube feet. Arabic numerals 1 to 6 indicate the spines standing on 1st to 6th adambulacral plates, respctively. Scale bars indicate 10mm in A and 1mm in B–F. Proximal is left in B, C, D, and F and bottom in E.";
dc:description"Fig. 5. Volume rendering images of Asthenactis agni n. sp. Holotype, NSMT E-13917. A, Lateral surface of the interradial area; B, abactinal surface at the center of the disc; C, abactinal view of the internal surface of the proximal part of the arm and the disc. Abbreviations: ab, abactinal plates; ad, adambulacral plates; am, ambulacral plates; an, anus; c, chevron plates; i, primary interradial plates; m, madreporite; od, odontophore; or, oral plates; r, primary radial plates.All scale bars indicate 1mm. Proximal is left in B.";
dc:description"Fig. 6. SEM images of spines of Asthenactis agni n. sp. A, Abactinal spines on the proximal portion of the arms; B, abactinal spines from one of the primary radial plates; C, furrow spines from 3rd adambulacral plate; D, actinolateral spines from 3rd adambulacral plate.";
dc:description"Fig. 1. Sampling site of Asthenactis agni n. sp. (indicated by an orange star) and the geographic distribution of nine known species of the family Myxasteridae in the world’s oceans. a, Asthenactis australis; b, Asthenactis papyraceus; c, Asthenactis fisheri; d, Myxaster medusa; e, Myxaster perrieri; f, Myxaster sol; g, Pythonaster atlantidis; h, Pythonaster murrayi; i, Pythonaster pacificus. Previous records with information of the sampling sites and/or coordinates are shown herein (Fisher 1906; Alton 1966; Downey 1979; Clark and Downey 1992; Howell et al. 2002; Dilman 2005; McKnight 2006; Mah et al. 2012; Mah 2020). The locality of A. papyraceus and one of the localities of P. atlantidis are Hawaii and the Porcupine Abyssal Plain, respectively, without data on the coordinates (open circles) (Fisher 1906; Howell et al. 2002). The colors of plots of orange, green, and purple correspond to the genera Asthenactis, Myxaster, and Pythonaster, respectively.";
