客蚤屬

客 = 各 + 宀 : Karl Marx (k) is receiving a visitor in the elevator's bathroom (e4). His guest is wearing a graduation cap (宀) and a dress made of stars (各).

蚤 = 叉 + 丶 + 虫 : Zorro (z) is eating a bowl of petal leaves (丶) in the aorta (ao3) when he discovers that there are a lot of fleas (叉) and mosquitoes (虫) in his dish. Even as he lifts his fork (叉) to inspect a petal leaf he finds the fleas dancing on the fork's cusps.

属 = 尸 + 禹 : 暴龙属 is the genus Tyrannosaurus, and I'll use a T-Rex as mnemonic symbol.

The great Yu (禹) built a dyke to prevent Sheldon Shrimp (shu) from entering his side of the space station (Ø3), but then a T-Rex (属) ghost (尸) starts to haunt him until he tears down his dyke.