Reptile Reproduction: From Snakes to Crocodiles
– Sexual dimorphism is very pronounced and difficult to distinguish males from females. The adult male is slightly smaller than the female, but has the longest tail and voluminous. Sometimes there are differences in the arrangement of the scales. In most cases the male has more plates and less ventral subcaudal.
Fertilization is internal in all reptiles
A) male reproductive organs
The male reproductive tract of snakes, has two hemipenis located at the base of the tail, ventral level, remaining invaginated in bags or boxes. Only used one of the hemipenis during intercourse, which outgrowths of his bag and enters the female’s cloaca. On the outer side of the crack is located hemipenis sperm, where the walks to be ejaculated semen. By hosting the hemipenis, the base of the tail of the male is often wider and flatter than the female. The sperm retain their vitality for my cho time
The testes are rounded, localized intra-abdominal, cranial to the kidneys, near the pancreas, gallbladder and spleen. The right testicle is located more cranially than the left. During the breeding season, increase in size. Of the testicles out caudally Wolffian ducts, which carry sperm to the hemipenis.
B) FEMALE REPRODUCTIVE
Female genital tract: The ovaries are located near the pancreas, kidney cranially. Also the right ovary is in a more cranial to the left. The suspensor structure that holds the ovaries is the mesovarium.
Snake eggs
The eggs of most snakes do not usually have the hard shell like those of birds, but are soft and leathery or parchment. The pups are out of them using a special tooth lose later. The eggs of some snakes, like the python of land, are very elongated, while the Indian python are oval-shaped common.
Snakes reproduce either by laying eggs that the female usually leave somewhere private, or giving birth to live young, which are also neglected. Both the eggs and the young can reach up to 100 numbers per set, but usually they are much less. The family care does not exist in regard to the offspring, although some species protect the eggs during the incubation period, the female incubates the python even. The growth is quite fast and the young reach maturity in the course of one to five years. The older that has occurred between the snakes is a little less than 30 years, both the anaconda and the black-lipped cobra.
REPRODUCTION of crocodilians
REPRODUCTIVE SYSTEM IN REPTILES
The ovaries and testes are paired in the first reptiles may contain cavities filled with lymph, as in amphibians or be solid, as in asee and mammals. The eggs of reptiles, although few in number when compared with lower vertebrates, are relatively bulky due to the large presence of a large amount of yolk is necessary for growth of breeding before maturity. Are often surrounded by albumin and wrapped in a leathery or calcareous eggshell, the albumen and the shell are produced by glands located along the oviducts that open separately from the cloaca.
The Wolffian duct degenerates arquinefrico or reptiles in females, but in male genital tract becomes functional whose upper end has large spirals and form a compact structure called the epididymis. As reptile eggs are incubated internally and surrounded by a thick shell when placed, internal fertilization is necessary and, consequently, males of many species have a copulatory organ, with special conditions of espermatozoico trasferenci females.
Lizards and snakes in there a couple of structures capable of extrusion or exit into the sewer they call hemipenis and serve this object, while crocodiles and turtles may have a structure homologous to the mammalian penis.
REPRODUCTION: Crocodiles have internal fertilization and external development of eggs and embryos.
Crocodile Mating takes 1 minute and is always held in the water.
The crocodile builds a nest on the bank above the high water to prevent flooding, and carries on during the night, lasting from 20 minutes to 1 hour. Placed between 15 and 80 elliptical eggs in a pit 40 cm deep.
The crocodiles are animals oviparous, meaning egg producer.
When finished laying, the female builds sand and grass at the entrance and cake with the tail material.
The incubation period is 3 months. The incubation temperature determines sex of baby crocodile. The temperature is not the same for the center of the nest than in the periphery. The higher the temperature will be born males, whereas at lower temperatures females are developed.
The female guards the entry against predators, always staying near the nest.
Incubation of eggs lasts 3 months.
In the reproductive success of species strongly influenced by environmental factors. The intense heat causes the mortality of eggs in those nests that are not well covered. Flooding also caused heavy casualties. And the hippos represent many losses on the banks heavily frequented by these animals.
The mother digs up the eggs when infants emit sounds that can be heard at 4 feet away.
The newly hatched crocodiles measuring 30 cm long and weigh about 500 grams.
At this point in his life, the children are very vulnerable to predators, it does not show any fear towards humans or animals.
The female carries her newborn baby into the water with his mouth and also protect them during their first months of life.
Small crocodiles can fall prey to lizards, herons, birds of prey, cormorants andspoonbills, sea turtles and large predatory fish such as catfish. Besides cats, hyenas, jackals, mongooses and genets.
Up to 90% of crocodiles perish during their first year of life.
Until the first 7 years of age, growth of young alligators is 10 to 20 cm per year. After 7 years of life, growth slows down a lot of crocodiles
The crocodile reaches sexual maturity at 14 years, when measured 2.5 to 3 meters in length.
– Sexual dimorphism is very pronounced and difficult to distinguish males from females. The adult male is slightly smaller than the female, but has the longest tail and voluminous. Sometimes there are differences in the arrangement of the scales. In most cases the male has more plates and less ventral subcaudal.
Fertilization is internal in all reptiles
A) male reproductive organs
The male reproductive tract of snakes, has two hemipenis located at the base of the tail, ventral level, remaining invaginated in bags or boxes. Only used one of the hemipenis during intercourse, which outgrowths of his bag and enters the female’s cloaca. On the outer side of the crack is located hemipenis sperm, where the walks to be ejaculated semen. By hosting the hemipenis, the base of the tail of the male is often wider and flatter than the female. The sperm retain their vitality for my cho time
The testes are rounded, localized intra-abdominal, cranial to the kidneys, near the pancreas, gallbladder and spleen. The right testicle is located more cranially than the left. During the breeding season, increase in size. Of the testicles out caudally Wolffian ducts, which carry sperm to the hemipenis.
B) FEMALE REPRODUCTIVE
Female genital tract: The ovaries are located near the pancreas, kidney cranially. Also the right ovary is in a more cranial to the left. The suspensor structure that holds the ovaries is the mesovarium.
Snake eggs
The eggs of most snakes do not usually have the hard shell like those of birds, but are soft and leathery or parchment. The pups are out of them using a special tooth lose later. The eggs of some snakes, like the python of land, are very elongated, while the Indian python are oval-shaped common.
Snakes reproduce either by laying eggs that the female usually leave somewhere private, or giving birth to live young, which are alsoabandoned. Both the eggs and the young can reach up to 100 numbers per set, but usually they are much less. The family care does not exist in regard to the offspring, although some species protect the eggs during the incubation period, the female incubates the python even. The growth is quite fast and the young reach maturity in the course of one to five years. The older that has occurred between the snakes is a little less than 30 years, both the anaconda and the black-lipped cobra.
REPRODUCTION of crocodilians
REPRODUCTIVE SYSTEM IN REPTILES
The ovaries and testes are paired in the first reptiles may contain cavities filled with lymph, as in amphibians or be solid, as in birds and mammals. The eggs of reptiles, although few in number when compared with lower vertebrates, are relatively bulky due to the large presence of a large amount of yolk is necessary for growth of breeding before maturity. Are often surrounded by albumin and wrapped in a leathery or calcareous eggshell, the albumen and the shell are produced by glands located along the oviducts that open separately from the cloaca.
The Wolffian duct degenerates arquinefrico or reptiles in females, but in male genital tract becomes functional whose upper end has large spirals and form a compact structure called the epididymis. As reptile eggs are incubated internally and surrounded by a thick shell when placed, internal fertilization is necessary and, consequently, males of many species have copulatory organs, especially for the transfer of espermatozoico females.
Lizards and snakes in there a couple of structures capable of extrusion or exit into the sewer they call hemipenis and serve this object, while crocodiles and turtles may have a structure homologous to the mammalian penis.
REPRODUCTION: Crocodiles have internal fertilization and external development of eggs and embryos.
Crocodile Mating takes 1 minute and is always held in the water.
The crocodile builds a nest on the bank above the high water to prevent flooding, and carries on during the night, lasting from 20 minutes to 1 hour. Placed between 15 and 80 elliptical eggs in a pit 40 cm deep.
The crocodiles are animals oviparous, meaning egg producer.
When finished laying, the female builds sand and grass at the entrance and cake with the tail material.
The incubation period is 3 months. The incubation temperature determines sex of baby crocodile. The temperature is not the same for the center of the nest than in the periphery. The higher the temperature will be born males, whereas at lower temperatures females are developed.
The female guards the entry against predators, always staying near the nest.
Incubation of eggs lasts 3 months.
In the reproductive success of species strongly influenced by environmental factors. The intense heat causes the mortality of eggs in those nests that are not well covered. Flooding also caused heavy casualties. And the hippos represent many losses on the banks heavily frequented by these animals.
The mother digs up the eggs when infants emit sounds that can be heard at 4 feet away.
The newly hatched crocodiles measuring 30 cm long and weigh about 500 grams.
At this point in his life, the children are very vulnerable to predators, it does not show any fear towards humans or animals.
The female carries her newborn baby into the water with his mouth and also protect them during their first months of life.
Small crocodiles can fall prey to lizards, herons, birds of prey, cormorants and spoonbills, sea turtles and large predatory fish such as catfish. Besides cats, hyenas, jackals, mongooses and genets.
Up to 90% of crocodiles perish during their first year of life.
Until the first 7 years of age, growth of young alligators is 10 to 20 cm per year. After 7 years of life, growth slows down a lot of crocodiles
The crocodile reaches sexual maturity at 14 years, when measured 2.5 to 3 meters in length.