sentences:  Hobbs described a total of 286 species (including 168 crayfish species and 104 entocytherid ostracods), 38 genera and subgenera (29 for crayfish, 8 entocytherids and "Neopalaemon", a shrimp), and one new family, Cambaridae.His work massively increased the knowledge of crayfish biology, and he authored or co-authored over 40% of the recognized species of North American crayfish.Horton has thus been referred to as "Old Man Crawfish" amongst his colleagues for his decades of research.