New records are provided of 31 species of scaleworm (and allied taxa) collected over a period of years from the Clyde and Argyll Sea Area. The species Pisione remota, Enipo elizabethae, Harmothoe antilopes, H. pagenstecheri, H. spinifera, Malmgrenia castanea, Malmgrenia ljungmani and M marphysae are newly recorded from the area, while Harmothoe fragilis is found for the first time from Scottish waters. The widespread occurrence of both Pholoe inornata and P. baltica in the area is confirmed. New records are also provided of parasitic copepods associated with scaleworrns including Selioides bocqueti, Herpyllobius polynoes, Herpyllobius arcticus, and Eurysilenium truncatum. E. truncatum is confirmed for the first time from British waters. Additional records are cited for entoprocts, hydroids, bryozoans and stalked ciliates attached to specimens of Gattyana cirrhosa or Aphrodita aculeata. The entoproct Loxosomella glandulifera is recorded for the first time from British waters