What is "belostoma"

Belostoma is a genus of the hemipteran family Belostomatidae, known colloquially as giant water bugs. Members of this genus are native to the Americas, with the greatest species richness in tropical South America. Most species in the family Belostomatidae have historically been included in Belostoma, but several of these have been moved to other genera (although Belostoma remains a genus with many members).