New species, occurrence records and observations of predation by deep-sea Asteroidea (Echinodermata) from the North Atlantic by NOAA ship Okeanos Explorer Author Mah, Christopher L. text Zootaxa 2020 2020-04-20 4766 2 201 260 journal article 22829 10.11646/zootaxa.4766.2.1 7fa4a4ce-5db2-4d06-adeb-db21b0574cef 1175-5334 3764018 urn:lsid:zoobank.org:pub:B47DC09C-181A-4DFE-B415-770AFFC11BD3 Solaster sp. 1 Figure 18E This species was stellate (R/r=~2.1–2.4) possessed a thick disk with nine relatively short, tapering arms. Abactinal paxillae weakly developed, but widely spaced on the surface. Each arm with approximately 20–30 evenly spaced paxillae, per side (40 to 60 from arm tip to arm tip) each with approximately three to six spinelets forming the actinolateral boundary. Color varied from orange to bright magenta-red. Crab Associate & Ecological Notes This red species was observed on a flat, muddy plain populated by what appeared to be ophiuroids with elongate arms possibly Ophiomusa lymani . Jangoux (1982) have indicated ophiuroids as a prey items for Solaster endeca , which is similar in appearance. This species hunting for ophiuroids would be consistent with the fact that while most asteroid observations are solitary, two individuals of this species are present within 60 cm of one another. FIGURE 18. Ophidiaster guildingi and Solaster spp. A. O. guildingi on large sponge. South of Okeanos Ridge, Gulf of Mexico, 424 m. B. O. guildingi on encrusting organisms. South of Okeanos Ridge, Gulf of Mexico, 25.60506 -84.55012, 480 m C. O. guildingi with arm on sponge. Stetson Mesa Terrace, 445 m. D. O. guildingi feeding on cup corals. South of Okeanos Ridge, Gulf of Mexico, 435 m. E. Orange species with crab associate (enlarged inset). Pamlico Canyon Ridge, North Atlantic 1587 m F. White species. Richardson’s Jellyfish, 846 m. The orange colored Solaster sp. 1 individual showed a small lithodid crab present on the abactinal surface of one arm. This area was significantly discolored and was a distinct white color as opposed to the darker orange on the remainder of the body. Its unclear if the crab had been feeding upon the surface tissue of the star or if the discoloration could have originated as a result of constant movement by the crab on that specific region of the arm.Although no accounts of deep-sea lithodid predation on asteroids were located, the shallow-water lithodid crab Paralithodes camtschatica has been observed to attack and feed on the asteroid Pycnopodia helianthoides ( Feder, 1980 ) . Occurrence: Pamlico Canyon Ridge, 1587–1673 m . Images Examined brittle star field. Pamlico Canyon Ridge, North Atlantic 34.77461 , -75.3424 , 1673 m EX1806_IMG_20180625T141433Z_ROVHD.jpg EX1806_IMG_20180625T141541Z_ROVHD.jpg with crab. Pamlico Canyon Ridge, North Atlantic 34.77497 , -75.34556 , 1587 m EX1806_IMG_20180625T165230Z_ROVHD.jpg