The mouth in living forms is suctorial and is not supported by jaws.
Impregnation is effected by the male attaching itself by its suctorial mouth to the female.
The young fish on hatching immediately used its suctorial disc to attach itself to the sides of the vessel in which it was placed.
They are probably remnants of the same primitive organs as the suctorial disc of Lepidosteus.
As the tadpole attains its full development, the suctorial organs behind the mouth gradually atrophy.
The wide condition of the mouth may not improbably be interpreted as a remnant of the suctorial state.
The Meckelian cartilage is at this stage placed in front of the nasal sacks, in the lower lip of the suctorial mouth.
And to omit a number of instances, in the suctorial Hemiptera or bugs we have different grades of structure in the mouth-parts.
All Arachnida, including Limulus, feed by suctorial action in essentially the same way as Scorpio.
By means of the suctorial mouth, stones are removed from more or less circular area so as to form a shallow excavation.