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Table 2 Definition of characters used for the construction of the morphological character matrix

From: Evolutionary diversification of secondary mechanoreceptor cells in tunicata

  Character definition
1 Single type of secondary sensory cells (present = 1, absent = 0)
2 Secondary sensory cells with a single cilium (monociliary) (present = 1, absent = 0)
3 Secondary sensory cells with two cilia (biciliary) (present = 1, absent = 0)
4 Secondary sensory cells with more than two cilia (multiciliary) (present = 1, absent = 0)
5 Cilia in multiciliary sensory cells of same length (0) / different lengths (1)
6 Microvilli or stereovilli on sensory cells (present = 1, absent = 0)
7 Microvilli on monociliary sensory cells (present = 1, absent = 0)
8 Stereovilli on monociliary sensory cells (present = 1, absent = 0)
9 Cilium of monociliary sensory cell surrounded by a ring of microvilli (0) or cilium eccentric to microvilli (1)
10 Microvilli on multiciliary sensory cells (present = 1, absent = 0)
11 Cilia in multiciliary sensory cells in a single line (0) or in multiple lines (1)
12 Accessory secretory cells in coronal organ (present = 1, absent = 0)
13 Supporting cells form a wall or crest alongside the coronal organ (present = 1, absent = 0)
14 Electron dense granules in sensory cells (present = 1, absent = 0)
15 Width of coronal organ uniform along oral rim (0) or wider at certain areas (1)
16 Accessory centriole in sensory cells (present = 1, absent = 0)
17 Tentacles or flaps present (present = 1, absent = 0)
18 Tentacles simple (0) / branched (1)
19 Secondary sensory cells in continuous row (present = 1, absent = 0)