Tripoblastic - Deuterostomes - Chordata - Reptilia Flashcards
Reptiles don’t have feathers or hair but
Scales
Endothermic or ectothermic?
Endothermic
Lungs ventilated by
chest movement
How many heart chambers
3 or 4
Amniotic egg laid where?
on land, often in burrow
Reptiles are a paraphyletic group which means
They do not include all descendants of their most recent common ancestor
Most reptiles jaw muscles are protected by what?
outside cranium (brain box) and there are indentations into cranium
‘Anapsid’
No arch
Jaw movements can squeeze what?
Brain
Modern turtles have short jaws and
Toothless beaks
‘Synapsid’
single arch: modern mammals
‘Diapsid’
two arches: modern lizards, snakes and crocodiles
(Reptile order) What are testudines?
Turtles, terrapins and tortoises
What forms testudine shells?
Dorsal and ventral plats - bones on inside and scales on outside
Unlike snakes, testudine skin…
is moulted continually
Testudines are the only vertebrates with what enclosed by ribs?
Pectoral and pelvic girdles
(Reptile order) What does tuatara mean?
Peaks on the back
Tuatara have a third…
Eye covered with pigmented scales (unknown function)
(Reptile order) What does squamata mean?
Scaled
Squamata are covered in scales made of?
Keratin - reduces water loss
Can squamata both both upper and lower jaws?
Yes. Snakes can swallow large prey
Squamata hearts have…
3 chambers partially separating oxygenated blood from deoxygenated blood
Males have paired penises with
Hooks
How are snake’s organs arranged
Paired organs mostly lie one in front of the other to fit into narrow body
Females guard eggs until
Hatching and in some species, continue to guard and communicate after hatching
Sex determination by temperature?
Greater than 30 degrees males, lower than 30 are females
What group are extinct reptiles?
Dinosaurs
When did dinosaurs first appear?
230 million years ago
‘Dinosaur’
Enormous lizard
Early dinosaurs were split into 2 major orders
Saurischia )lizard hipped) and Ornithischia (bird hipped)
