New Genera, Species and Occurrences of Deep-Sea Asteroidea (Valvatacea, Forcipulatacea, Echinodermata) collected from the North Pacific Ocean by the CAPSTONE Expedition Author Mah, Christopher L. text Zootaxa 2022 2022-07-12 5164 1 1 75 http://dx.doi.org/10.11646/zootaxa.5164.1.1 journal article 10.11646/zootaxa.5164.1.1 1175-5326 6821026 3BECB9C7-F4B5-4FA4-934B-1822BF3D1077 Bathyceramaster Mah 2016a Mah 2016a: 105 Diagnosis. Abactinal plates tabulate, low to moderate in height with fasciolar grooves, variably shallow to well-developed, plates lacking stellate bases. Abactinal, marginal, actinal surfaces covered by densely arranged polygonal to round granules. Body stellate, many species with well-developed arms (R/ r=1.8–4.0). Comments. This genus was created to accommodate Mediaster elegans Ludwig 1905 , which lacked the stellate, radiating ossicles that are present in all species belonging to the genus Mediaster (Fisher 1911; Mah 2016a ). The tabular plates and well developed fasciolar grooves were also not as well-developed in Bathyceramaster as they are in Mediaster . Known Bathyceramaster spp. have only been reported from relatively deep-water settings, below 600 m , primarily between 1000–4000 m . Based on the occurrence of known species, Bathyceramaster occurs widely throughout the Pacific in a manner similar to other deep-sea Goniasteridae , such as Sibogaster ( Mah 2016a ) .