Alonella is a genus of Chydoridae.
The genus was described in 1862 by Michael Sars.
It has cosmopolitan distribution. The results of genetics analysis revealed at least twelve divergent phylogenetic lineages, possible cryptic species, of Alonella, with different distribution patterns. As expected, the potential species diversity of this genus is significantly higher than traditionally accepted.
Species: Alonella brachycopa Brehm, 1931 Alonella breviceps Stingelin, 1905 Alonella clathratula G.O. Sars, 1896 Alonella dadayi Birge, 1910 Alonella excisa (Fischer, 1854) Alonella exigua (Lilljeborg, 1853) Alonella nana (Baird, 1843) Alonella propinqua Smith, 1909 Alonella pulchella Herrick, 1884 Alonella qranulata Brehm, 1933
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