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Archosaurs crocs pterosaurs

Zoology 212 Lecture notes on archosaurs, crocs, and pterosaurs
Course

Zoology (BIOL 212)

28 Documents
Students shared 28 documents in this course
Academic year: 2022/2023
Uploaded by:
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Saginaw Valley State University

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23 Leatherback turtles migrate 10,000 miles / year between nesting & feeding sites. um ces/cbl/release/2012/feb/29/landm ark-study-leatherback- turtle-m igration-identifies-pacific-danger-zones-crit Turtles exhibit excellent navigational abilities with a compass and a map sense, crucial for reproduction. Temperature (°C) Sex ratio (% male) Trachemys scripta Macroclemys temminckii Alligator mississippiensis They exhibit temperature-sex-determination. Adaptive significance & mechanisms are debated. Oviparity: eggs incubate in sand. 23 Archosaurs have an anteorbital fenestrae, inverted triangular orbit, and a fully divided ventricle of the heart. 24 Socket tooth: thecodont 24

To

lightedal

~

spiral valuefood

flow diverts more furthes car - T 2 Chambers ligament holds tooth in N more efficient

25

Crocodiles, alligators, caiman, and gharials are the living,

sister-group of birds.

osteoderm parental care & nest building tapetum lucidum: crepuscular 0591, CC BY 2. thermoregulation 25 26

Crocodilyans have the strongest bite of any animal

[>3x humans], but its mouth is kept closed with your hands!

Internal nares shifts posteriorly Safero, CC BY 2. Secondary palate 26

Archosaurs

↓

~ releasing

of

bone sit in Skin heat

-reflects

light

low light levels

B C

Sami

aquatic

  • Nests &arental care

creche after Notting regation I heat for

eggs

chirping

- Parental

care

birth

ectothermic

Scaranger,

Chew - breathe Simutansoly 2 American

Predators

& ater R B

- floor of

choana ↓ palate -> ceiling Rid

“Dinosaurs” was coined by Sir Richard Owen in 1842 to describe 3 fossils of “fearfully great reptiles”. 29 2010 “Humans and dinosaurs lived at the same time.” sprawling (dinosaurs, mammals) erect 29 Hip structure differentiates 2 groups of dinosaurs. 30 Ornithischia† Saurischia x 30 clown a sideways " stick"

  • -allows it to hang ↓
  • limbs under body NO bird hipped lizzard hipped head head tail tail
↓

T Pubis ↑ Pubis

Ornithischians were herbivores but anatomically diverse. 31 31 Saurischians are trophically diverse: (1) quadrapedal herbivores ... 32 Small head: don’t chew food Heavy tail: counterbalance of tail Large size: Whip tail: communication? slow heartbeat R. Somma Psittacosaurus gastroliths coprolite 32 all

####### extinct lost teeth

to became beak all on head

↓Usaratops
Stegasour

sauropods-> => head ↑ stomach stones

↓

fossilized POOP

Dinosaur biology: were they endothermic or ectothermic, homeothermic or poikilothermic? 35 1. Dinosaurs were endotherms. 2. Dinosaurs were ectothermic... was warmer in the Mesozoic. 3. They were physiologically between ecto- and endotherms. 4. They were inertial homeotherms. 5. None of the above! 35 Large dinosaurs disappear 65 my [end of Mesozoic]. Why? 36 What is known ... Biologically: mass extinction of ~60% species with marine groups hit worse Geologically: thin layer of iridium [rare metal] in strata about 65 mya Short-term environmental changes: high soot, acid rain, reduced sunlight Long-term global changes: warm, mild climate to cooler, variable climate Intrinsic gradualists Extrinsic catastrophists 36

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Archosaurs crocs pterosaurs

Course: Zoology (BIOL 212)

28 Documents
Students shared 28 documents in this course

University: Saginaw Valley State University

Was this document helpful?
3
23
Leatherback turtles migrate 10,000 miles / year
between nesting & feeding sites.
http://www.umces.edu/cbl/release/2012/feb/29/landmark-study-leatherback-
turtle-migration-identifies-pacific-danger-zones-crit
Turtles exhibit excellent navigational abilities with a compass
and a map sense, crucial for reproduction.
Tem perature (
°
C)
Sex ratio (% male)
Trachemys
scripta
Macroclemys
temminckii
Alligator
mississippiensis
They exhibit temperature-sex-determination.
Adaptive significance & mechanisms are debated.
Oviparity: eggs incubate in sand.
23
Archosaurs have an anteorbital fenestrae, inverted triangular
orbit, and a fully divided ventricle of the heart.
24
Socket tooth: thecodont
24
To
lighted
al
~
spiral
value
food
flow
diverts
more
furthes
car
-
T
2
Chambers
ligament
holds
tooth
in
N
more
efficient

Students also viewed

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