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11 results for “Velatida”
Fig. 3 in First Record of the Family Myxasteridae (Asteroidea: Velatida) from Western North Pacific with Description of a New Species of Asthenactis
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 10 mm in A and 1 mm in B–F. Proximal is left in B, C, E, and F.
Fig. 5 in First Record of the Family Myxasteridae (Asteroidea: Velatida) from Western North Pacific with Description of a New Species of Asthenactis
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 1 mm. Proximal is left in B.
Fig. 4 in First Record of the Family Myxasteridae (Asteroidea: Velatida) from Western North Pacific with Description of a New Species of Asthenactis
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 10 mm in A and 1 mm in B–F. Proximal is left in B, C, D, and F and bottom in E.
Fig. 6 in First Record of the Family Myxasteridae (Asteroidea: Velatida) from Western North Pacific with Description of a New Species of Asthenactis
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.
Fig. 1 in First Record of the Family Myxasteridae (Asteroidea: Velatida) from Western North Pacific with Description of a New Species of Asthenactis
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.
Fig. 1. Pteraster militaris. A in A new record of sea star genus Pteraster (Asteroidea: Velatida: Pterasteridae) from the East Sea, Korea
Fig. 1. Pteraster militaris. A, dorsal view; B, ventral view; C, ventral side of arm; D, webbed adambulacral spines (AS) and tube feet (TF); E, oral part; F, oral spines (arrows) and oral part. Scale bars: A, B = 5 cm; C, E, F = 3 cm; D = 1 cm.
FIGURE 20. Velatida. A. Remaster palmatus. Stetson Mesa Terrace, 445.4 m. B in New species, occurrence records and observations of predation by deep-sea Asteroidea (Echinodermata) from the North Atlantic by NOAA ship Okeanos Explorer
FIGURE 20. Velatida. A. Remaster palmatus. Stetson Mesa Terrace, 445.4 m. B. Large specimen (30.0 cm total diameter) of Pythonaster atlantidis, NW Florida Escarpment, 1970 m. C and D. Pythonaster atlantidis sponge predation. DeSoto Canyon, 2604 m, showing dorsal and oral views (C&D respectively). E. Feeding on hexactinellid sponge. Jaguey Spur, off Puerto Rico, 2668 m. Feeding.
FIGURE 3. Pythonaster atlantidis USNM E18842. A in Range Extensions and Taxonomic Notes on Atlantic Myxasteridae (Velatida; Asteroidea)
FIGURE 3. Pythonaster atlantidis USNM E18842. A. Abactinal surface. Scale bar=1.5 cm B. Annulations on arm. Scale bar=5.0 mm. C. Actinal surface showing tube foot groove. D. Oral plate. Scale bar=5.0 mm.
FIGURE 2. Myxaster sol USNM 1189026. A in Range Extensions and Taxonomic Notes on Atlantic Myxasteridae (Velatida; Asteroidea)
FIGURE 2. Myxaster sol USNM 1189026. A. Complete animal surface, Scale bar=1.5 cm. B. Abactinal surface, close up. Scale bar=1.5 cm. C. Actinal surface. Scale bar=1.5 cm. D. Imbricate abactinal plates without space on distal arm region. Scale bar=2.0 mm. E. Abactinal plates showing wider spaces between plates from disk/arm region. Scale bar=3.0 mm F. Furrow spines. Scale bar=5.0 mm. G. Abactinal plate shape, individual close-up on disk. Scale bar= 3.0 mm.
FIGURE 1 in Range Extensions and Taxonomic Notes on Atlantic Myxasteridae (Velatida; Asteroidea)
FIGURE 1. Myxaster sol (long armed variant) A. USNM E18596. Scale bar=1.5 cm. B. YPM Y36040. Scale bar=1.0 cm. Myxaster perrieri Holotype, EcAh3840, Scale bar for C–E=5.0 mm. C. Abctinal surface. D. Actinal surface. E. Arms from holotype.
Fig. 2 in First Record of the Family Myxasteridae (Asteroidea: Velatida) from Western North Pacific with Description of a New Species of Asthenactis
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 1970 m.
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