Louse
Yes, an aphid is a small sap-sucking insect.
tick
horsefly
Tick.
It may be the Hawk Moth your on about
mosquito and spider
Tsetse fly
bloodsucking insect beginning with l and has 5 letters?
A louse is not a filter feeder, it is a blood sucking insect.
bacteria and fungi. worms and insect larva will eat some of it.
They eat by sucking its prey