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Many mammalian species have developed keratinized penile spines along the glans or shaft, which may be involved in sexual selection.These spines have been described as being simple, single-pointed structures or complex with two or three points per spine (strepsirrhines). [1]
The fossa is unique within its family for the shape of its genitalia, which share traits with those of cats and hyenas. The male fossa has an unusually long penis and baculum (penis bone), [ 18 ] reaching to between his forelegs when erect, with an average thickness of 20 mm (0.79 in).
Erect bulbus glandis (1) in a Labrador Retriever. The bulbus glandis (also called a bulb or knot) is an erectile tissue structure on the penis of canid mammals. [1 ...
Fox species differ in fur color, length, and density. Coat colors range from pearly white to black-and-white to black flecked with white or grey on the underside. Fennec foxes (and other species of fox adapted to life in the desert, such as kit foxes), for example, have large ears and short fur to aid in keeping the body cool.
The hemipenis is the intromittent organ of Squamata, [4] which is the second largest order of vertebrates with over 9,000 species distributed around the world. They differ from the intromittent organs of most other amniotes such as mammals, archosaurs and turtles that have a single genital tubercle, as squamates have the paired genitalia remaining separate. [5]
Baculum of a dog's penis; the arrow shows the urethral sulcus, which is the groove in which the urethra lies. Fossil baculum of a bear from the Miocene. The baculum (pl.: bacula), also known as the penis bone, penile bone, os penis, os genitale, [1] or os priapi, [2] is a bone in the penis of many placental mammals.
The outer parts are known as the genitals or external genitalia, visible at birth in both sexes, [1] while the inner parts are referred to as internal genitalia, which in both sexes, are always hidden. [2] In plants, male reproductive structures include stamens in flowering plants, which produce pollen. [3]
Male genitalia of Lepidoptera. The main component of the male reproductive system is the testicle, suspended in the body cavity by tracheae and the fat body.The more primitive apterygote insects have a single testis, and in some lepidopterans the two maturing testes are secondarily fused into one structure during the later stages of larval development, although the ducts leading from them ...