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- 1a. Single large primary tubercles present on intermbulacral plates.
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- Mesodiadema
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1b. Distinct primary tubercles absent. - Go to 2
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| 2a. Periproct enclosed by apical disc. Go to 3 |
2b. Periproct separated from apical disc. Go to 4 |
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3a. Anal sulcus present.
Menopygus |
3b. No anal sulcus.
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4a. Periproct inframarginal.
Infraclypeus |
4b. Periproct marginal to supra-ambital Go to 6 |
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6a. Apical disc elongate with small auxilliary plates incorporated between paired oculars and posterior genital plates.
Desorella |
6b. Apical central, tetrabasal with 4 gonopores. Genital plate 2 separates posterior genital plates. Two small auxilliary plates incorporated between posterior oculars. Galeroclypeus |
