Fig. 3. SEM images of various ossicle structures in brittle stars. A. Muscle and nerve opening on LAP separated by small ridge if at all (<i>Amphiura chiajei</i> Forbes, 1843). B. Muscle and nerve opening on LAP separated by large, prominent ridge or regular stereom (<i>Ophiolycus purpureus</i> (Düben &amp; Koren, 1846)). C. Non-keeled vertebra (<i>Amphiura chiajei</i>). D. Keeled vertebra (<i>Ophiothrix fragilis</i> Abildgaard, 1789). E. Vertebra with oral bridge (<i>Euryale aspera</i> Lamarck, 1816). F. Sockets indicate teeth and tooth papillae on dental plate as single row (<i>Amphilepis norvegica</i> (Ljungman, 1865)). G. ½ single row of teeth and ½ tooth papillae (<i>Ophiothrix fragilis</i>). H. ⅔ single row of teeth and ⅓ tooth papillae (<i>Ophiocamax vitrea</i> Lyman, 1878). I. Sockets on dental plate covering evenly (<i>Asteronyx loveni</i> Müller &amp; Troschel, 1842). J–K. LAP not arched = position lateral. L. LAP arched = wrapped around the arm.
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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