Between them is situated, sometimes asymmetrically, the prominent intromittent organ.
When adult the males may always be distinguished from the females by the presence of a pair of horny intromittent organs, one of which is lodged in the terminal segment of each palpus or appendage of the second pair.
Intromittent organ of male beneath the genital operculum (=sternum of the 1st somite of opisthosoma).
Intromittent organ of male in the apical segment of the 2nd prosomatic appendage.
Intromittent organ of male lodged on the dorsal side of the 1st pair of prosomatic appendages.) Families - Hexisopodidae (Hexisopus).
Intromittent organ of male beneath sternum of the 1st somite of the opisthosoma.
Intromittent organ of male placed at the distal end of the appendage of the 5th pair.
Intromittent organ of male lying within the genital orifice.
The intromittent organs of the male are remarkable for their complexity and elaboration.
The penis is the intromittent organ of generation, and is made up of three cylinders of erectile tissue, covered by skin and subcutaneous tissue without fat.
The terminal part of the male ducts may be protrusible and act as an intromittent organ, or this function may be discharged by some of the appendages, as, for instance, in the Brachyura.
Male with an intromittent copulatory organ.
The fourth category is represented by the Apoda or Caecilians in which, as we have stated above, the male is provided with an intromittent organ.