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Lepidosaurs

Zoology 212 Lecture notes on lepidosaurs

Course

Zoology (BIOL 212)

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Students shared 28 documents in this course

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Saginaw Valley State University

Academic year: 2022/2023

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Amniota [tetrapods with amnion] Follow the yellow brick road ... 9 Synapsida Early tetrapod lineages [1 pr temp. fen.] Diapsida [2 pr temp. fen.] anthracosaurs temnospondyls Amphibia [extant & extinct lineages] Lissamphibia [extant only] Subsets of the larger groups 9 Diapsida ~ 300 mya Diapsids form a clade comprised of 4 lineages. 10 Lepidosauria Plesiosaur/pliosaur† Ichthyosaur† Archosauria 10

Ichthyosaurs† [“fish lizard”] were viviparous, marine, dolphin- like predators with excellent swimming abilities. 11 Som erset Co, England. Photo: Sara Rieboldt, © UC M useum of Paleontology. Ichthyosaurus intermedius Fish & squid-like diet Orientation of fluke resembles fish, not dolphins. Time Morphologicaldisparity Convergent evolution 11 Plesiosaurs† and pliosaurs† were predators with long necks flippers. Obviously fully aquatic, they returned to water. 12 Live birth pliosaur Rudkin et al. 2003 Pliosaur teeth were the size of bananas. 12 all marine

hydrodynamic

in body fluke moves left 70

####### evolutionary

right - limages

####### aquadia

sent iT Embr4O By

surrounded

amnion

C arity viviD

Lizards have arboreal, aquatic, burrowing, terrestrial, and aerial members... 2 venomous species. 15 Fossorial amphisbaenid Tongue-throwing apparatus Gecko foot and toe pads Komodo dragon mentalfloss/article/87167/12-biting-facts-about-gila-monsters Gila monster ectothermy vs. endothermy homeothermy vs. poikilothermy concept 15 autotomy 16 Lizards are not a clade; some lizards are more closely related to snakes than to other lizards. Thorny devil agamid, W Aust. 5-lined skink: MI lizard And ... Shoot blood from your eyes! 16 exctothermic - -self cleaning

gliders

↑ releasing 2 -

S venomous

burrows ↓ external Internal constant interanc internal body temp temp flucuates many times in a day trace runner regenerate tail fatt tail stores lipids

Snakes have kinetic skulls, fused eyelids, reduced left lung,

no external ear, and a forked tongue.

Vestigial hind limbs Vomeronasal organ Agility: hundreds of vertebrae. Grip: ventral scales C. Argoud/ESRF Kinetic skull 17 18

~20% snakes are venomous but 99% of all snake stories.

Venom [saliva] is a cocktail of enzymes; an example of

convergent evolution. elaphids

hydrophiids colubrids Infrared detection viperids Pit organ thermal image 18

rig:danger

roof

of

mouth

↓ris

able

to taste

-

air

to,

order

particles

pharmones

isn't

Upper

saythat

no longer functional

scales give

Grip

Simulitera

RiDT

↑Pelvic spurs

must be

injected

↓

modified

saliva-

enzymes

S

of

E groups are

Swathesnouspes

pit vipers active at

dif 5

night

renmons

times

detect heat

2

of of prey

type

Only 1 in N. able to make a flexable fang t very affective hallow strike

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Lepidosaurs

Course: Zoology (BIOL 212)

28 Documents

Students shared 28 documents in this course

University: Saginaw Valley State University

Was this document helpful?

Amniota

[tetrapods with amnion]

Follow the yellow brick road …

Synapsida

[1 pr temp. fen.]

Early tetrapod lineages

Diapsida

[2 pr temp. fen.]

anthracosaurs

temnospondyls

Amphibia

[extant & extinct lineages]

Lissamphibia

[extant only]

Subsets of the

larger groups

Diapsida

~ 300 mya

Diapsids form a clade comprised of 4 lineages.

Lepidosauria

Plesiosaur/pliosaur†

Ichthyosaur† Archosauria

Lepidosaurs

Zoology (BIOL 212)

Saginaw Valley State University

Comments

Students also viewed

Related documents

Preview text

hydrodynamic

surrounded

amnion

gliders

S venomous

Snakes have kinetic skulls, fused eyelids, reduced left lung,

no external ear, and a forked tongue.

~20% snakes are venomous but 99% of all snake stories.

Venom [saliva] is a cocktail of enzymes; an example of

convergent evolution. elaphids

rig:danger

roof

of

mouth

↓ris

able

to taste

-

air

to,

order

particles

pharmones

Upper

saythat

scales give

Grip

Simulitera

RiDT

↑Pelvic spurs

must be

injected

↓

modified

saliva-

enzymes

S

of

E groups are

Swathesnouspes

dif 5

night

renmons

times

2

type

Lepidosaurs

Course: Zoology (BIOL 212)

University: Saginaw Valley State University

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Students also viewed

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