Ephydatia is a genus of sponges belonging to the family Spongillidae.

The genus was first described by Jean Lamouroux in 1816.

The genus has cosmopolitan distribution.

Species:

• Ephydatia caatingae Nicacio & Pinheiro, 2015
• Ephydatia chileana Pisera & Sáez, 2003
• Ephydatia facunda Weltner, 1895
• Ephydatia fluviatilis (Linnaeus, 1759)
• Ephydatia fortis Weltner, 1895
• Ephydatia gibbsii Gray, 1821
• Ephydatia gutenbergiana (Müller, Zahn & Maidhoff, 1982)
• Ephydatia japonica (Hilgendorf, 1882)
• Ephydatia kaiseri Rauff, 1926
• Ephydatia meyeni (Carter, 1849)
• Ephydatia millsii (Potts, 1888)
• Ephydatia muelleri (Lieberkühn, 1856)
• Ephydatia mülleri (Lieberkühn, 1855)
• Ephydatia ramsayi (Haswell, 1883)
• Ephydatia robusta (Potts, 1888)
• Ephydatia subtilis Weltner, 1895
• Ephydatia syriaca Topsent, 1910

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