Related Clues:

• Squarepants species
• It's a real sucker
• Mosquito or mole, e.g.
• Annelid used in hirudotherapy
• Fly, perhaps
• 17-Across in the neck
• Tick or flea, e.g.
• Annoying bug
• Irksome one
• It's a bleedin' worm
• Pain in the ass
• Fast learner
• Priest's helper
• SquarePants is one
• One who 26-Across