genital papilla, intromittent
organs) to transfer sperm into the female reproductive tract (Blake 1868; Hubbs 1917; Tarp 1952; Gardiner 1978).
They are morphologically quite similar--the primary character distinguishing them is differences in the male genitalia, specifically the aedeagus, or intromittent
Although sex-role reversal has been identified in several different animals, Neotrogla is the only example in which the intromittent
organ is also reversed," Kazunori Yoshizawa from Hokkaido University in Japan said.
Male genitalia/gonopods are intromittent
organs which are widely used in taxonomy on the grounds that they exhibit species-specific characters (Song & Bucheli 2010).
In male teleosts, androgens are an important output of the BPG axis because they stimulate gonadal development, initiate spermatogenesis, provide biofeedback regulation of the BPG axis and regulate the expression of secondary sexual characteristics such as nuptial color changes, behavior, and intromittent
organs (Blazquez et al.
In males, the reproductive system features epididymis, responsible for temporary spermatozoa storage, and intromittent
organs (penis) to transfer gametes to the body of females (ROMER; PARSONS, 1985).
The male's intromittent
organ, his phallus, which includes a long, highly flexible, threadlike distiphallus, must penetrate deep into the female to deposit sperm near the ventral receptacle and the mouth of the spermatecal duct (Marchini et al.