A comprehensive morphological descriptions of three marine water mites (Acari: Hydrachnidia: Pontarachnidae) from Hainan Island, China

This paper provides redescriptions of three pontarachnid species collected from the marine littoral of Hainan Island, China, i.e. Litarachna curtipalpis Smit, 2003, L. thetis Pešić and Smit, 2016, and Pontarachna australis Smit, 2003. Litarachna curtipalpis and L. thetis are recorded new for the Chinese fauna. Detailed morphological characters, including idiosoma coloration, gnathosomal structure, cheliceral claws, palps, and legs, were examined using optical microscopy and scanning electron microscopy (SEM).