Shallow-water reef ophiuroids (Echinodermata: Ophiuroidea) of Réunion (Mascarene Islands), with biogeographic considerations Author Boissin, Emilie Author Hoareau, Thierry B. Author Paulay, Gustav Author Bruggemann, J. Henrich text Zootaxa 2016 4098 2 273 297 journal article 10.11646/zootaxa.4098.2.4 13fb3418-fb61-410f-9ce2-93099f5344d7 1175-5326 255654 D446E3D3-5B5B-431A-80E6-1318638DFA27 Ophionereis porrecta LYMAN, 1860 complex sp. 1 (UF-6437, Fig. 4 h, KC760063 ) Material. 1 spm, St. 3; 9 spms, St. 5; 2 spms, St. 7 Remarks. Two colour forms of O . porrecta occur on Réunion and they are genetically deeply divergent indicating that they represent two species. They are treated as sp. 1 and sp. 2 in the O . porrecta complex here. Species 1 shows little differentiation in COI sequence across the Indian Ocean from Madagascar to W Australia , but is deeply divergent from sister populations in the Pacific (Boissin et al. in revision). Specimens concur well with the description of the species: they have small radial shields, enlarged disc scales on the periphery, one supplementary arm plate on each side of the dorsal arm plates, genital papillae. O . porrecta can be differentiated from O . degeneri by its longer arm spines, the presence of larger marginal disc plates and smaller supplementary dorsal arm plates (Stöhr 2011). The mottled brown colour of sp. 1 matches Lyman’s description well. The type locality of O . porrecta is unknown ( Lyman 1860 ). Abundance: 2. Distribution. A widespread IWP species previously recorded from Réunion ( Guille & Ribes 1981 ; Stöhr et al. 2008 ) and Rodrigues ( Rowe & Richmond 2004 ).