< Dichotomous Key
| Dichotomous Key: Annelida | |||||||
|---|---|---|---|---|---|---|---|
|
1
- Reversible proboscis
- Present - #3: Rhynchobdellae
- Not present - #2:Arhynchobdellae
2
- Teeth
- Present - Gnathobdellae
- Not present - Pharyngobdellae
3: Rhynchobdellae
- Body shape
- Flat - Glossiphoniidae
- Cylindrical - Pisciolidae
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