Fig. 2. SEM images of various brittle star ossicles. A–E. Disc structures. A. Dorsal disc, radial shield with tubercles (<i>Ophiomusa lymani</i> (Wyville-Thomson, 1873)). B. Dorsal disc (<i>Ophiolimna bairdi</i> (Lyman, 1883)). C. Ventral disc (<i>Ophionereis porrecta</i> Lyman, 1860), the interradius is assumed as a triangle and H gives its height. D. Dorsal disc, triangular radial shield (<i>Ophiactis savignyi</i> (Müller &amp; Troschel, 1842)). E. Ventral disc, mouth (<i>Ophioderma</i> sp.). – F–H. Atypical arm spines. F. Umbrella-shaped arm spine (<i>Ophiotholia spathifer</i> (Lyman, 1879)). G. Hook-shaped arm spine (<i>Asteronyx loveni</i> Müller &amp; Troschel, 1842). H. Bristle spines (<i>Ophiernus vallincola</i> Lyman, 1878). – I–L. Lateral arm plates (LAP). I. LAP with constriction (<i>Ophioscolex glacialis</i> Müller &amp; Troschel, 1842). J. Dorsal and ventral part of LAP without constriction (<i>Ophiura ophiura</i> (Linneaus, 1758)). K. Ventral part of LAP projecting ventro-proximalwards (<i>Ophiopallas paradoxa</i> Koehler, 1904). L. Ventral part of LAP not projecting ventro-proximalwards (<i>Ophiosphalma fimbriatum</i> (Koehler, 1922)).
Goharimanesh, M., Stöhr, S., Mirshamsi, O., Ghassemzadeh, F., &amp; Adriaens, D. (2021). Interactive identification key to all brittle star families (Echinodermata; Ophiuroidea) leads to revised morphological descriptions. <i>European Journal of Taxonomy</i>, 766(1), 1-63.
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