Deep-sea (> 1000 m) Goniasteridae (Valvatida; Asteroidea) from the North Pacific, including an overview of Sibogaster, Bathyceramaster n. gen. and three new species Author Mah, Christopher L. text Zootaxa 2016 4175 2 101 141 journal article 10.11646/zootaxa.4175.2.1 d7cbc23a-7a4c-4616-83fd-059fb458f7b6 1175-5326 257286 B264C215-000D-42C5-8AC9-B801872CD182 Ceramaster Verrill, 1899 Verrill, 1899 : 161 [as Tosia ( Ceramaster ) ] Fisher, 1906 : 1054; 1911: 162, 204; Verrill, 1914 : 289; Koehler, 1924 : 173; Mortensen, 1927 : 80; Djakonov, 1950 : 38; Tortonese & A.M. Clark, 1956 : 347; Halpern, 1970b : 62; 1970c: 212; 1970: 62; Downey, 1973 : 49; McKnight, 1973 : 178; Downey, 1973 : 49; A.M. Clark & Courtman-Stock, 1976 : 61; Downey in Clark & Downey, 1992 : 231; A.M. Clark 1993 : 247; H.E.S. Clark & McKnight 2001 : 32, Mah 2011: 5 (as Ceramaster ) Koehler, 1909 : 78 [type species Pentagonaster ( Philonaster ) mortenseni Koehler, 1909 ] (as Philonaster ) Verrill, 1914 : 292 (As Tosiaster ) Comments. Several issues surround the genus Ceramaster , including uncertainty regarding its monophyly and overlap with such genera as Peltaster (Mah 2011) . I argue that species described herein most closely resembles the type species, C. grenadensis and share several fundamental synapomorphies, including the presence of wide (W>L) inferomarginal plates, strongly abactinal facing superomarginal plates, and a flattened, pentagonal body shape (R/r<2.0). These characters serve to separate C. clarki , C. grenadensis , C. japonicus , C. leptoceramus , C. smithi and C. pointsurae n. sp. from Bathyceramaster . Descriptions of some Ceramaster sp., including Ceramaster glasbyi McKnight 1993 display a more stellate shape and lack fasciolar grooves. These will need to be considered more thoroughly pending an overview of the 16 species nominally assigned to Ceramaster .