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.