Cnemidaster Sladen 1889

CNEMIDASTER SLADEN, 1889 Cnemidaster Sladen, 1889: 423; Fisher, 1919a: 389; 1919b: 471, 480, 481, 485; Hayashi, 1943: 174; Spencer & Wright, 1966: U74; Clark & Mah, 2001: 230. Mammaster Perrier, 1894: 114 (in key); Fisher, 1919a: 389; 1919b: 471, 481; Spencer & Wright, 1966: U75; Downey, 1970: 12; Clark & Downey, 1992: 403; Clark & Mah, 2001: 231. Type species: Cnemidaster wyvilli Sladen, 1889. Diagnosis: Disc plates enlarged, swollen, rounded. Disc thick, discontinuous with arms in smaller specimens (below R = 7.0). Disc and arm plates imbricate. Disc and arm surface largely bare, covered with membranous skin. Internal buttress present.Published as part of Mah, Christopher, 2007, Phylogeny of the Zoroasteridae (Zorocallina; Forcipulatida): evolutionary events in deep-sea Asteroidea displaying Palaeozoic features, pp. 177-210 in Zoological Journal of the Linnean Society 150 (1) on page 190, DOI: 10.1111/j.1096-3642.2007.00291.x, http://zenodo.org/record/543087