Sinclair, Bradley J., Borkent, Art & Wood, D. Monty, 2007, The male genital tract and aedeagal components of the Diptera with a discussion of their phylogenetic significance, Zoological Journal of the Linnean Society 150 (4), pp. 711-742 : 724

publication ID 10.1111/j.1096-3642.2007.00314.x

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Description ( Fig. 2F View Figure 2 )

Testis: Each testis is pear-shaped, with short anterior filaments, covered by brownish fat tissue ( Abul-Nasr, 1950).

Epididymis: Not differentiated.

Vas deferens: These ducts are rather short, running posteriorly, clothed in brownish fat tissue, as found on the testis. The ducts consist of one thin layer throughout, except for a layer of glandular cells at the junction with the seminal vesicle ( Abul-Nasr, 1950).

Accessory gland and seminal vesicle: Each vas deferens empties separately into the proximal end of a pair of elongate accessory glands ( Abul-Nasr, 1950). These long glands remain separate and possess a layer of glandular cells that produce a secretion that surrounds the spermatozoan mass ( Abul-Nasr, 1950). Each gland is coated with a thin layer of circular muscles and large amounts of spermatozoa are stored in this paired gland shortly after emergence of the adult ( Abul-Nasr, 1950).

Ejaculatory duct: Each gland empties separately into the ejaculatory duct, which remains medially divided, entering the sperm pump closely appressed. This duct is long and convoluted, starting as a thickened tube, which gradually decreases in thickness posteriorly. Circular muscles coat the distal portion of the duct ( Abul-Nasr, 1950).

Ejaculatory apodeme, sperm pump, and aedeagus: The ejaculatory apodeme is rod-shaped, and acts as a piston to compress the sperm pump, forcing the seminal fluid into the long, slender, coiled aedeagal tube ( Abul-Nasr, 1950). The sperm pump is partially enclosed by the fused, concave, plate-like paramere.

Remarks: The male genital tract of Anisopodidae was illustrated by Abul-Nasr (1950) and Dahl (1980). The aedeagus is very long and thread-like and the sperm pump clearly functions to pump seminal fluid through this tube. The ejaculatory duct is a paired tube and no spermatophores are formed.