Ptychogonimus megastomum (Rudolphi 1819) Lühe 1900

are endoparasites of

• World Register of Marine Species: Zearaja nasuta (Müller & Henle 1841) (New Zealand rough skate) (adult)
• World Register of Marine Species: Mustelus canis (Mitchill 1815) (Dusky smooth-hound) (adult)
• World Register of Marine Species: Mustelus californicus Gill 1864 (Gray smoothhound) (adult)
• World Register of Marine Species: Mustelus lunulatus Jordan & Gilbert 1882 (巴拿馬星鯊) (adult)
• World Register of Marine Species: Mustelus mustelus (Linnaeus 1758) (Smooth-hound) (adult)

geographic distribution

• World Register of Marine Species: Baja California
• World Register of Marine Species: English Channel
• World Register of Marine Species: Bermuda
• World Register of Marine Species: Adriatic Sea
• World Register of Marine Species: Central New Zealand

trophic guild

• World Register of Marine Species: endoparasite
• World Register of Marine Species: endoparasite
• World Register of Marine Species: endoparasite
• World Register of Marine Species: endoparasite
• World Register of Marine Species: endoparasite