The unnamed mosquito-girl in Chapter 49 is dressed like Shimakaze from Kantai Collection.
There is a notable difference between the magazine and the tankobon versions; in the magazine, the unnamed mosquito-girl was originally shown to have only two arms, which contradicted her later appearances which showed her having four. This was eventually corrected with the tankobon release, where the mosquito-girl is consistently depicted with four arms.
Okayado states that their first appearance in chapter 49 was very incomplete, and as an apology, he asked fans to choose to be one of the male background characters that appeared in the chapter (that's why they all had numbers). He added them in the final release of the volume, along with fixes on the girls: a more gyaru mosquito + two more arms; a more shiny leech + some sort of eye emojis on her face; more makeup for the lamprey girl.