The genus Ctenocephalus refers to a specific group of fleas that are aptly identified by their unique physical characteristics. These fleas typically feed on mammals, particularly those found in North America and Europe. There are many synonyms that can be used to refer to Ctenocephalus, including the genus names "Nosopsyllus" and "Paraceras." Other common synonyms include the species names "Canis" and "Felis," which are often used to describe fleas that feed specifically on dogs or cats, respectively. While these terms may vary slightly in their usage, they all represent the same general group of fleas that share many common characteristics and behaviors.