Taxonomic review of Ophiothrix Müller & Troschel, 1840 (Echinodermata Ophiuroidea) from Brazil, with the description of four new species Santana, Alisson Manso, Cynthia L. C. Almeida, Ana C. S. Alves, Orane F. S. Zootaxa 2020 2020-07-01 4808 1 51 78 Muller & Troschel 1840 [241,375,1576,1603] Ophiuroidea Ophiotrichidae Ophiothrix Animalia Ophiurida 20 71 Echinodermata genus    1a Radial shields covered by spines......................................................................... 2  1b Radial shields naked.................................................................................. 5   2a First dorsal arm plate with small spines......................................................  O. tommasii  n. sp.  2b Dorsal arm plates without spines......................................................................... 3   3a Interradial dorsal disc covered by long spines..............................................  O. spiniformis  n. sp.  3b Interradial dorsal disc covered by short spines.............................................................. 4   4a Dorsal arm plates triangular, with a medial ridge..................................................  O. trindadensis  4b Dorsal arm plates lozenge, without a medial ridge...........................................  O. brasiliensis  n. sp.   5a Disc covered with long needle-shapped spines.....................................................  O. suensoni  5b Disc covered with short spines.......................................................................... 6   6a Interradial dorsal disc covered by long conical spines..........................................  O. troscheli  n. sp.  6b Interradial dorsal disc covered by short bifid and trifid spines.........................................  O. rathbuni