Somanniathelphusa is a genus of freshwater crabs found in southeast China, Taiwan, and southeast Asia. It includes the following species:
- Somanniathelphusa amoyensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa araeochela <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa bawangensis <small>Dai & Xing, 1994</small>
- Somanniathelphusa boyangensis <small>Dai, Peng & Zhou, 1994</small>
- Somanniathelphusa brevipodum <small>Tai, Song, He, Cao, Xu & Zhong, 1975</small>
- Somanniathelphusa dangi <small>Yeo & Nguyen, 1999</small>: Vietnam
- Somanniathelphusa falx <small>Ng & Dudgeon, 1992</small>
- Somanniathelphusa gaoyunensis <small>Dai, Peng & Zhou, 1994</small>
- Somanniathelphusa grayi <small>(Alcock, 1909)</small>
- Somanniathelphusa guillinensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa hainanensis <small>Dai & Xing, 1994</small>
- Somanniathelphusa huaanensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa huanglungensis <small>Dai, Peng & Zhou, 1994</small>
- Somanniathelphusa kyphuensis <small>Dang, 1975</small>: Vietnam
- Somanniathelphusa lacuvita <small>Ng, 1995</small>
- Somanniathelphusa linchuanensis <small>Dai, Peng & Zhou, 1994</small>
- Somanniathelphusa longicaudus <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa megachela <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa nanningensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa pax <small>Ng & Kosuge, 1995</small>: Vietnam
- Somanniathelphusa plicatus <small>(Fabricius, 1798)</small>: Vietnam
- Somanniathelphusa qiongshanensis <small>Dai & Xing, 1994</small>
- Somanniathelphusa ruijiensis <small>Dai, Peng & Zhou, 1994</small>
- ' <small>(H. Milne-Edwards, 1853)</small>: China, Vietnam
- Somanniathelphusa taiwanensis <small>Bott, 1968</small>
- Somanniathelphusa tongzhaensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa triangularis <small>Dang & Hai, 2005</small>: Vietnam
- Somanniathelphusa yangshanensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa yuilinensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa zanklon <small>Ng & Dudgeon, 1992</small>
- Somanniathelphusa zhangpuensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa zhapoensis <small>Naiyanetr & Dai, 1997</small>
- Somanniathelphusa zhongshiensis <small>Dai, Peng & Zhou, 1994</small>
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