Reproduction in: 1.Amphibians 2.Reptiles 3.Turtles 4.Snakes 5.lizards vet-student.mihanblog.com.

Reproduction in:

1.Amphibians2.Reptiles3.Turtles4.Snakes5.lizards

vet-student.mihanblog.com

Amphibians and Reptiles

1. Most frogs and toads mate in the water water with eggs being fertilized and released to attach to vegetation.


FROG MATINGvet-student.mihanblog.com

Anurans = mating season for amphibiansRainfall can induce mating.

Amphibians reproduce sexually


Eggs hatch into tadpolestadpoles that breathe through external gillsexternal gills which go through metamorphosis to become a land dwelling adult. vet-student.mihanblog.com

Salamander Eggs are unpigmentedvet-student.mihanblog.com

Males get aggressive, they lock their feet in the rear of her shell, flip over and will mate for a couple of hours. She will sometimes drag him around.


Turtles are oviparous.

a. They lay eggs and deposit them in a nestnest cavity in the soil for them to hatch later.


Turtles usually lay eggs in warmer months


b. Incubation time varies from 30 days for soft-shelled turtles to 18 months for land tortoises (average is 60 – 90 days, depending on soil temperature).vet-student.mihanblog.com

SnakesSnakes may lay eggs from 30 – 85 days after mating.

a. Eggs incubate for 40 – 90 days before hatching.vet-student.mihanblog.com

b. Ovoviviparous snakes retain eggs in their body until they are hatched in 90 – 150 days.


Egg Laying SnakesEgg Laying Snakes All pythons Kingsnakes Milksnakes Rat snakes Corn snakes


CLUTCHCLUTCH

•A group of eggs that will hatch together


•Female pythons and King Cobras are 2 of only a few groups of reptiles to care for her eggs after oviposition. •A female will coil around her eggs until they hatch, protecting the eggs and providing temperature regulation, as well.


c. Some snakes are live-bearing snakes with baby snakes receiving nourishment during development from mother


Live birth of snakevet-student.mihanblog.com

MOST SNAKE SPECIES THAT LIVE IN COLDER AREAS ARE LIVE BEARING


Live bearing snakes

All boas

All vipers

Garter snakes


Most snakes mate once a year


Hemipenes of male snakevet-student.mihanblog.com

Snakes mating. It may take him days to get her attention. vet-student.mihanblog.com

Lizards

MOST are egg layers.


Egg Layers Iguanas Water dragons Geckos Veiled chameleons Panther chameleons Monitors


Livebearers Solomon Island skink

Blue-tongue skink Shingle-backed skink

Jackson's chameleon


a. Smaller sizes hatch in 30 days or less (anoles, geckos)

b. Large sizes take as long as 120 days (monitor lizard)


Crocodilians lay hard-shelled eggs and deposit in soil nest for air incubation of about 90 days.


All crocodilians guard their nests. Crocodilians also assist the hatchlings as they emerge from their nests, and will guard them for a while after hatching.


Did you know that the sex of a crocodile is determined by the temperature of the eggs during incubation?


Lizards reach sexual maturity based on size, more than chronological age. Small lizards may become reproductively active at 1-2 years of age, while larger lizards may be 3-4 years old


Males have 2 copulatory organs called hemipenes, one on each side of the base of the tail. Either one of the two hemipenes may be used for internal fertilization.


Urination does not occur through the hemipenes.

The tissue is not erectile either.


Female lizards have paired ovaries and oviducts. Ovaries vary in size.


The oviducts possess both an albumin-secreting function and a shell-secreting function. There is no true uterus. The oviducts connect to and open directly into the cloaca through papillae.


GRAVID= fertilized female lizard


Reproduction in: 1.Amphibians 2.Reptiles 3.Turtles 4.Snakes 5.lizards vet-student.mihanblog.com.

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Transcript of Reproduction in: 1.Amphibians 2.Reptiles 3.Turtles 4.Snakes 5.lizards vet-student.mihanblog.com.