Ophiothrix, Muller & Troschel, 1840

Santana, Alisson, Manso, Cynthia L. C., Almeida, Ana C. S. & Alves, Orane F. S., 2020, Taxonomic review of Ophiothrix Müller & Troschel, 1840 (Echinodermata Ophiuroidea) from Brazil, with the description of four new species, Zootaxa 4808 (1), pp. 51-78 : 71

Key to Ophiothrix species from Brazil

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