
- 1. Hypostomal suture (HyS) complete
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- 2. Occipital foramen (OF) circular, with distinct collar
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- 3. Prothoracic setae 5-7 (5-7-P) borne on small isolated tubercles
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- 4. Seta 12 on abdominal segment I (12-I) present and/or seta 7
on abdominal segments III-V (7-III-V) much larger and longer
than seta 9 (9-III-V) on the same segment
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- 5. Seta 3-VII very long and usually single
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- 6. Seta 5-VIII inserted well below dorsal margin of segment X
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- 7. A single pair of seta 1-S inserted distal to pecten (Pt)
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- 8. Comb (C) and pecten (Pt) present
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- 9. Saddle (Sa) incomplete
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- 10. Ventral brush (VB) (seta 4-X) with five or six pairs of setae
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