What are the adaptive traits for reproduction of spiders, shrimp, millipedes, flies, and mosquitoes?

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An adaptation is a physical trait that gives an organism a survival advantage in an environment that it would not ordinarily have.  In the case of spiders, spiders have a specialized set of pedipalps, the end section housing a special palpal bulb used to deliver sperm to the female for egg fertilization.

Shrimp similarly have a protruding penes on the male mantis shrimp.  The purpose of the penes is to deliver sperm to the genital slit of the female shrimp during copulation. 

Male millipedes have a secondary sex organ called a gonopod.  The purpose of the gonopod is to store and deliver sperm to the female millipede when the millipedes copulate.

Flies have a torsional difference between the sperm duct of the male and the genital orifice of the female.  The male must face an opposite direction for the necessary alignment.  This gives flies a faster reproductive rate than most other insects.

Mosquitoes seem to be the only specimen in the group without a specialized trait for reproductive adaptation.  In all the other groups, the existence of a structure to help deliver the sperm to the female seems to be the common thread in terms of a reproductive adaptation trait.

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