Reproduction in: Amphibians Reptiles Turtles Snakes lizards Vet-student.mihanblog.com Reproduction in: Amphibians Reptiles Turtles Snakes lizards vet-student.mihanblog.com

Amphibians and Reptiles 1. Most frogs and toads mate in the water with eggs being fertilized and released to attach to vegetation. vet-student.mihanblog.com

                                                                                FROG MATING vet-student.mihanblog.com

Anurans = mating season for amphibians Rainfall can induce mating. Amphibians reproduce sexually vet-student.mihanblog.com

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

Salamander Eggs are unpigmented vet-student.mihanblog.com

Turtles mating                                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. vet-student.mihanblog.com

Turtles are oviparous. a. They lay eggs and deposit them in a nest cavity in the soil for them to hatch later. vet-student.mihanblog.com

Turtles usually lay eggs in warmer months vet-student.mihanblog.com

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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Snakes 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. vet-student.mihanblog.com

Egg Laying Snakes All pythons Kingsnakes Milksnakes Rat snakes Corn snakes vet-student.mihanblog.com

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A group of eggs that will hatch together CLUTCH A group of eggs that will hatch together vet-student.mihanblog.com

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. vet-student.mihanblog.com

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

Live birth of snake vet-student.mihanblog.com

MOST SNAKE SPECIES THAT LIVE IN COLDER AREAS ARE LIVE BEARING vet-student.mihanblog.com

Live bearing snakes All boas All vipers Garter snakes vet-student.mihanblog.com

Most snakes mate once a year vet-student.mihanblog.com

Hemipenes of male snake vet-student.mihanblog.com

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

Lizards MOST are egg layers. vet-student.mihanblog.com

Egg Layers Iguanas Water dragons Geckos Veiled chameleons Panther chameleons Monitors vet-student.mihanblog.com

Livebearers Solomon Island skink Blue-tongue skink Shingle-backed skink Jackson's chameleon vet-student.mihanblog.com

a. Smaller sizes hatch in 30 days or less (anoles, geckos) b. Large sizes take as long as 120 days (monitor lizard) vet-student.mihanblog.com

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

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. vet-student.mihanblog.com

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Did you know that the sex of a crocodile is determined by the temperature of the eggs during incubation? vet-student.mihanblog.com

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 vet-student.mihanblog.com

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. vet-student.mihanblog.com

Urination does not occur through the hemipenes. The tissue is not erectile either. vet-student.mihanblog.com

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Female lizards have paired ovaries and oviducts. Ovaries vary in size. vet-student.mihanblog.com

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. vet-student.mihanblog.com

GRAVID= fertilized female lizard vet-student.mihanblog.com