And to omit a number of instances, in the suctorial Hemiptera or bugs we have different grades of structure in the mouth-parts.
The mouth in living forms is suctorial and is not supported by jaws.
Lampreys are carnivorous creatures, and attach themselves to fishes by their suctorial mouths, and rasp away the flesh.
Impregnation is effected by the male attaching itself by its suctorial mouth to the female.
If, of course, its suctorial mouth had arisen from an ancestral gnathostomatous mouth, then the argument would have more force.
The young fish on hatching immediately used its suctorial disc to attach itself to the sides of the vessel in which it was placed.
It seems likely that any suctorial insect which feeds on a plague-stricken rat will take numbers of the bacilli into its stomach.
They are probably remnants of the same primitive organs as the suctorial disc of Lepidosteus.
The suctorial disc is still a prominent structure at the end of the snout.
As the tadpole attains its full development, the suctorial organs behind the mouth gradually atrophy.
suctorial suc·to·ri·al (sŭk-tôr'ē-əl)
Relating to or adapted for sucking.