１−３ Pentaneura group
dorsomental teeth absent or vestigial
return to Tanypodinae
１−３−１ Ligula with 5 teeth. Basal segment of maxillary palp divided ２〜５・・・・・・・・・・Ablabesmyia group
１−３−２ Ligula with 5 teeth. Basal segment of maxillary palp 1.・・・・・・・・・・・・・・・・・・・・・・・Nilotanypus group
１−３−３ Ligula with 4 or 8 teeth.・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・other Tanypodinae
Ablabesmyia group
| ligula | antannal ratio | basal segment of maxxilla | dorsomental teeth | claws of posterior parapod | |
| Ablabesmyia | 5 teeth concave | ３.８〜５.２ | ２〜５ seg. | １４〜２０ | 1〜3 claws brown |
| Paramerina | 5 teeth straight | ３以下 | ２seg. | ９〜１５ | all claws light yellow |
Ablabesmyia
Body length ３〜７mm.
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| 5 teeth of ligula concave slightly. Middle tooth straight or slightly curved outwards. Paraligula divided. Pecten hypopharyngis with 14〜20 teeth. | Basal segment of maxilla divided 4 segments. | Basal segment of maxilla divided 3 segments. |
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| ・Antenna 4 segments. Antenal ratio .8〜5.2. The length of antenna is about head. Antenna slender. ・Mandible curved gently., basal tooth large. ・1〜3 claws of posterior parapod dark brown. |
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| 5 teeth of ligula straight. Pecten phypopharyngis with about 10 teeth. |
Basal tooth and inner teeth of mandible large. | Antenal ratio less than 3. |
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・2 nd segment of antenna long. Antenal ratio less than 3. ・5 teeth of ligula straight. ・Basal tooth and inner teeth of mandible large. ・Basal segment of maxilla divided into 2. ・Dorsomentum without tooth . |
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