Ichthyaetus

Trivial name	Latin name
Mediterranean gull	Ichthyaetus melanocephalus
Audouin's Gull	Ichthyaetus audouinii
Great Black-headed Gull	Ichthyaetus ichthyaetus
Sooty Gull	Ichthyaetus hemprichii

comparison of wing and tail configuration¹

¹ According to Hartmann (2000a, 2000b and 2016)