ABDOMEN: Respiratory aperture - Siphon | |_ ABDOMEN: Abdominal plates | |_ HEAD: Uranotaenia species - setae 5 & 6C {1. abdominal plates absent , 3. on segments VIII, VII and VI} | |_ ABDOMEN: Siphonal tufts {2. only on segment VIII , 3. on segments VIII, VII and VI}