Amphibians and Reptiles Flashcards
Herpetofauna
both amphibians and reptiles
biotic vs. abiotic
B- Living
AB- Non-living
Ectothermic
outside energy sources to maintain body temp for metabolism and regulatory functions
Tetrapods
Snakes, frogs, etc
Snakes have evolutionary lost their legs
Frog explosion
Chitrid Fungus
Caecilians
legless amphibians
amphibians Evolved from
lobe-finned fishes
Lobe-finned fishes
Crossopterygians
no gills, primitive lung
345 million years ago
Late Devonian Period
Amphibian Characteristics of skin
Permeable skin
allows O2 & CO2 transfer
can uptake chemicals in environment
Olfaction
Sense of smell
(Amphibians have a good sense of smell)
Torpor
a state of dormancy when conditions are unfavorable
(like mammal hibernation)
Cold
Hibernation
Hot
Estivation
Larvae hearts
2-chambered
Adult hearts
3-chambered
Identified species #
2,375
Anura (Salientia)
Frogs and Toads
No tail
Caudata (Urodela)
Salamanders
Visible tail
Gymnophiona (Apoda)
Caecillians
No legs
Trachystoma
Mud eels
Rough mouth
Known species of frogs
3500
Known species of toads
300
Salamander features
only amphibian with tail as an adult
Salamander legs
forelimbs and hindlimbs = in length
Salamander eggs
Individual eggs in water/land
NO TADPOLE STAGE –> MINI ADULT
Caecilians features
TENTACLES- sensory organs
often blind
Body covered by skin and scales
Caecilian Reproduction
INTERNAL fertilization
LIVE YOUNG
Caecilian body
30 cm to 1.3 m
head and trunk… NO TAIL
Skin and Scales
Trachystoma species
3 living species of mud eels or sirens
Eastern United States and Northeastern Mexico
True frogs (non suction)
Rana
Tree frogs (suction)
Hyla
Frogs changing color
Hyla versicolor
Paratoid clands
secrete toxins
Plethodontid Salamanders
Lungless
Breathe through skin
Ambystomatid Salamandars
lungs
aerobic respiration
Mole Salamanders
Hellbender Salamanders
Grow to 2ft in USA
Hidden gills
5ft in Japan
anamniotic eggs
no shells: gelatinous layers
stream breeding
breeding, larvae, and occasional foragign
wetland breeding
breeding, larval periods, upland
terrestrial breeding
no water for reproduction
no larval stage
Defense:
toxins
large # of offspring
noisy squawks when attacked
adaptations to cold
Frog spine vertebrae
nine
cervical vertebra
end of the spine and allows neck movement
Posterior to cervical are…
7 trunk vertebrae
posterior to trunk vertebrae…
a single sacral vertebrae that supports hind legs
extends from the sacral vertebra
slim bone urostyle
Pectoral girdle
form the shoulders connect to front legs
True or False:
frogs have ribs
false
Maxillary teeth
line the perimeter of the
UPPER JAW
Two patches of vomerine teeth
Project from bones on ROOF of mouth