Derocephalus angusticollis

Derocephalus angusticollis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Diptera
Family:	Neriidae
Genus:	Derocephalus
Species:	D. angusticollis
Binomial name
Derocephalus angusticollis Enderlein, 1922[1]
Synonyms
Telostylinus bivittatus Cresson, 1926[2]

Derocephalus angusticollis is a fly in the family Neriidae. They are typically found on the east coast of Australia near rotting vegetation. Aggregating on the rotting bark of trees such as Acacia longifolia and other trees in New South Wales and southern Queensland.^[3] Derocephalus angusticollis flies found in the wild have accelerated speeds of development and age of mortality when compared to those in captivity. One characteristic of the neriid fly is that it demonstrates sexual dimorphism. Males have a larger build as well as exaggerated physical characteristics such as wider heads and longer limbs. Certain phenotypic characteristics are dependent on the diet of the parents.

Derocephalus angusticollis practices polyandrous mating behavior. Males take part in the practice of mate guarding where they use their legs to keep hold of the female during copulation and to push competing males away. Sexual conflict can be found in this fly as females have coiled oviducts that lead to their spermathecae. In order for the male to reach the spermathecae to deposit their sperm, antagonistic coevolution of the males having a flexible aedeagus occurred.