Reproduction in:
1.Amphibians2.Reptiles3.Turtles4.Snakes5.lizards
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Amphibians and Reptiles
1. Most frogs and toads mate in the water water with eggs being fertilized and released to attach to vegetation.
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FROG MATINGvet-student.mihanblog.com
Anurans = mating season for amphibiansRainfall can induce mating.
Amphibians reproduce sexually
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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.
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Turtles are oviparous.
a. They lay eggs and deposit them in a nestnest cavity in the soil for them to hatch later.
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Turtles usually lay eggs in warmer months
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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
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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.
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Egg Laying SnakesEgg Laying Snakes All pythons Kingsnakes Milksnakes Rat snakes Corn snakes
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CLUTCHCLUTCH
•A group of eggs that will hatch together
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•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.
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c. Some snakes are live-bearing snakes with baby snakes receiving nourishment during development from mother
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Live birth of snakevet-student.mihanblog.com
MOST SNAKE SPECIES THAT LIVE IN COLDER AREAS ARE LIVE BEARING
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Live bearing snakes
All boas
All vipers
Garter snakes
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Most snakes mate once a year
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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.
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Egg Layers Iguanas Water dragons Geckos Veiled chameleons Panther chameleons Monitors
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Livebearers Solomon Island skink
Blue-tongue skink Shingle-backed skink
Jackson's chameleon
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a. Smaller sizes hatch in 30 days or less (anoles, geckos)
b. Large sizes take as long as 120 days (monitor lizard)
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Crocodilians lay hard-shelled eggs and deposit in soil nest for air incubation of about 90 days.
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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.
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Did you know that the sex of a crocodile is determined by the temperature of the eggs during incubation?
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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
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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.
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Urination does not occur through the hemipenes.
The tissue is not erectile either.
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Female lizards have paired ovaries and oviducts. Ovaries vary in size.
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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.
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GRAVID= fertilized female lizard
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