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Table 1 Comparative difference in size, shape, and spines in five species of Echinoderes of which muscle architecture was investigated

From: Comparative myoanatomy of Echinoderes (Kinorhyncha): a comprehensive investigation by CLSM and 3D reconstruction

  Trunk length (μm) Outline Middorsal spines Tergal extensions
E. dujardinii 350 Barrel shaped 5 short Short
E. hispanicus 300 Elongated 3 long Short
E. horni 270 Elongated None Short
E. spinifurca 270 Elongated 5 long Long
Echinoderes sp. 270 Bulbous anterior end 1 short Short