| Summary: | This study results from a continued investigation of the occurrence and diversity of parasites of freshwater fish in the Solomon Islands. Thus, we revealed a new host as well as a new site of infection and a new geographical area for the cryptogonimid parasite, <i>Stemmatostoma cribbi</i> (Digenea: Cryptogonimidae). The cryptogonimid species was identified based on general morphology and on molecular data of metacercariae found in the gills of the cleft-lipped goby, <i>Sicyopterus cynocephalus,</i> from Ranongga Island, Western Province of the Solomon Islands. This is the first report of a <i>Stemmatostoma</i> sp. digenean parasitizing fish of the genus <i>Sicyopterus</i> in the Indo-Pacific region and the first report of <i>S. cribbi</i> infection in a fish from the Solomon Islands. Phylogenetic analysis performed by Bayesian inference and maximum likelihood confirmed the presence of the cryptogonimid in a well-supported subclade of <i>Stemmatostoma</i> spp.
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