 - 1. Hypostomal suture (HyS) complete
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 - 2. Maxilla (Mx) with unmodified brush or a bundle of coalesced filaments
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 - 3. Seta 12-I absent
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 - 4. Comb (C) and pecten (Pt) present
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 - 5. Seta 1-S single, inserted well above base of siphon
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 - 6. Saddle (Sa) incomplete
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 - 7. Ventral brush (VB) (seta 4-X) usually with four pairs of setae
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