Which mosquito is known for having a long siphon that hangs diagonally?

The mosquito known for having a long siphon that hangs diagonally is Culex. This particular feature distinguishes Culex mosquitoes from other genera. The elongated siphon serves a specific purpose; it allows the mosquito to feed on available water sources while keeping the rest of its body above the surface, which aids in respiration and avoids potential predators.

In contrast, Aedes mosquitoes have a shorter siphon and are often recognized for their white markings and bold patterning. Mansonia mosquitoes are known for their aquatic larval stage that feeds on aquatic plants, and their siphons differ in structure, adapted for their specific habitat. Ochlerotatus (which is sometimes included within the Aedes genus depending on classification) also has shorter siphons and distinctive markings, further separating them from Culex. Understanding these morphological characteristics is important in mosquito identification and in the study of their habits and behaviors in public health contexts.