haustellata

from The Century Dictionary.

• Haustellate or suctorial insects; a subclass or superorder of Insecta, containing those which suck instead of bite, having a haustellum of some form instead of manducatory mandibles or biting-jaws: opposed to Mandibulata.
• A suborder of Anoplura, including haustellate or true lice.
• A division of Diptera.
• A subclass of Crustacea, including haustellate, suctorial, or siphonostomous forms, as fish-lice. Also called Suctoria and Epizoa.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An artificial division of insects, including all those with a sucking proboscis.