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They found no evidence of plague in the rat population, concluding the disease might have been spread directly between humans, possibly by what they near-poetically described as "the suctorial parasites of mankind".

Biting mandibles; second maxillae incompletely or completely fused; often forming a suctorial proboscis.

A group of suctorial Infusoria, which in the adult stage are stationary.

By means of the suctorial mouth, stones are removed from more or less circular area so as to form a shallow excavation.

There are, however, peculiar difficulties in those cases in which, as among the Lepidoptera, the same species is mandibulate as a larva, and suctorial as an imago.