The species groups of Pectinopygus (Phthiraptera: Philopteridae)

The dispar assemblage of species is defined with a key and four new species described [Pectinopygus aquaticus, P. timmermanni, P. maritimus, P. insularis]. The species group of Pectinopygus are defined with a key and the question discussed whether the dispar assemblage is a natural group equivalent to these other groups. The specialised setae found in Pectinopygus are described. The Piaget species of Pectinopygus are discussed, eight lectotypes designated and four names placed in synonymy.