We used paraffin histological techniques to describe the black perch spermatocyte and intromittent organ morphology.
Examination of the tissue of the anal fin of black perch < 90 mm SL that had not yet developed intromittent organs revealed that tissue of the presumptive intromittent organ was present (Fig.
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).
In widow spiders (Latrodectus), the tip of one or both of the male's intromittent organs
(emboli) often breaks-off during copulation to be left inside the female's genitalia (Levi 1959; Bhatnagar & Rempel 1962; Wiehle 1967; Kaston 1970; Berendonck & Greven 2002; Segoli et al.
These include differences in external reproductive anatomy--males possess elongate intromittent organs
(claspers) whereas females do not; differences in size--females are often larger than males (7, 8); differences in tooth morphology--many male batoids possess cuspidate teeth to grip their female mates during courtship and copulation (9-11); and differences in skin thickness--some female sharks and rays possess a significantly thicker dermis than males (12, 13).