The vector of malaria parasites is

Malaria is an infectious disease caused by protozoan parasites of the genus Plasmodium [2]. These parasites are transmitted to humans through the bite of an infective female Anopheles mosquito, which acts as the primary vector. Only female mosquitoes serve as vectors because they require a blood meal to provide nutrients for egg production, whereas male mosquitoes typically feed on nectar. When a female Anopheles mosquito bites an infected person, it ingests the parasite, which then undergoes a sporogonic development cycle within the mosquito's midgut and salivary glands [1]. Once the parasite matures into sporozoites, it is injected into the next human host during a subsequent blood meal. While other mosquitoes like Culex can transmit diseases such as West Nile virus, they are not the vectors for human malaria [3].

Sources

1. [2] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Malaria > p. 78
2. [1] https://www.cdc.gov/malaria/causes/index.html
3. [3] https://www.ncbi.nlm.nih.gov/books/NBK234322/