Which mosquito species is known to breed in crab holes?

The mosquito species known for breeding in crab holes is Culex opisthopus. This species exhibits a unique adaptation that allows it to utilize the habitats created by crabs for breeding. The natural depressions and cavities in the mud made by crabs provide the ideal environment for the mosquito eggs and larvae, as these areas are often filled with water during high tides or after rainfall.

Culex opisthopus primarily thrives in coastal regions where crab burrows are prevalent. This breeding behavior not only showcases the species' ability to exploit specific ecological niches but also highlights the interconnectedness of animal behaviors and environmental conditions in shaping mosquito breeding habits.

The other mosquito species listed do not typically take advantage of crab holes for breeding. For instance, Psorophora columbiae is known to breed in flooded fields and temporary water bodies but does not rely on crab holes. Aedes canadensis predominantly breeds in tree holes and natural containers, while Anopheles quadrimaculatus is usually found in clean, freshwater environments associated with streams and ponds. Only Culex opisthopus is specialized for the breeding conditions provided by crab holes, making it the correct answer to this question.