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Which family are fangless?
Boidae, Pythonidae
Which family are rear fanged?
Colubridae
Which family are fixed fanged?
Elapidae
Which family have folding fangs?
Viperidae

Infraorder + Family?
Scolecophidia, Leptotyphlopidae
Threadsnakes
- cycloid scales
- short/blunt tail
- Tiny eyes
- 100+ species


Infraorder + Family? (Hint: in the tropics)
Alethinophidia, Tropidophiidae
Thunder snakes
-tropics
~ 50 species


Infraorder + Family?
Alethinophidia, Boidae
Boas
- NA/SA, Asia, Africa
- singular subcaudal
- vestigial spurs
~ 50 species


Infraorder + Family?
Alethinophidia, Pythonidae
Pythons
- Africa, Philippines, Australia, India
- Robust/Large
- heat sensing pits
- divided subcaudal
~ 50 species


Infraorder + Family?
Alethinophidia, Cylindrophiidae
Burrowing Snakes
- Checkered white black bellies
~ 10 species


Infraorder + Family?
Alethinophidia, Uropeltidae
Shield-tailed snake
- modified tail (shield)
~50 species


Infraorder + Family?
Alethinophidia, Xenopeltidae
Sunbeam
- HIGHLY IRIDESCENT
- pointed snout
~ >10 species


Infraorder + Family?
Alethinophidia, Acrochordidae
Wart snakes
- Baggy skin
- pebbly/keeled scales
- tiny eyes
~ >10 species


Infraorder + Super Family + Family + Sub Family?
Alethinophidia, Colubroidea, Viperidae, Viperinae
True Vipers
- Stout body
- no heat pits/rattles
~100 species


Infraorder + Super Family + Family + Sub Family?
Alethinophidia, Colubroidea, Viperidae, Crotalinae
Pit Vipers
- pit organ
~200 species


Infraorder + Super Family + Family?
Alethinophidia, Colubroidea, Homalopsidae
- tentacles (specimen we have)
~30 species


Infraorder + Super Family + Family?
Alethinophidia, Colubroidea, Elapidae
- Fixed fang
- colorful
- loreal absent
~400 species


Infraorder + Super Family + Family?
Alethinophidia, Colubroidea, Colubridae
- Rear fang
+2k species


What are these scales?
A: Post-ocular
B: Pre-ocular
C: loreal
D: Infralabial
E: Supralabial
F: Post-nasal

What order?
Amphisbaenia
Worm lizards
- ring like scales
~200 species


Infraorder + Family + Scientific name?
- tiny eyes
- spiney tail tip
Scolecophidia, Leptotyphlopidae
Rena humilis
Western Blind Snake


Infraorder + Family + Scientific name?
- Little to no patterning
- vestigial leg spurs
Alethinophidia, Boidae
Charina bottae
Northern rubber boa


Infraorder + Superfamily + Family + Subfamily + Scientific name?
- light eye stripe
- heat sensing pit
- Dark blotch with dark border
Alethinophidia, Colubroidea, Viperidae, Crotalinae
Crotalus oreganus
Western Rattlesnake


Infraorder + Family + Scientific name?
3 longitudinal stripe
Alethinophidia, Boidae
Lichanura trivirgata
Rosy Boa


Infraorder + Superfamily + Family + Subfamily + Scientific name?
- Speckled
- dark stripes on tail
- more head scales
Alethinophidia, Colubroidea, Viperidae, Crotalinae
Crotalus mitchellii
Speckled rattlesnake


Infraorder + Superfamily + Family + Subfamily + Scientific name?
- large eyelid scale
- eyestripe longer
- dark band thinner than white (tail)
- less head scales
Alethinophidia, Colubroidea, Viperidae, Crotalinae
Crotalus scutulatus
Mojave rattlesnake


Infraorder + Superfamily + Family + Subfamily + Scientific name?
- horn-like above eyes (superocular)
- paler
- has pits
Alethinophidia, Colubroidea, Viperidae, Crotalinae
Crotalus cerastes
Sidewinder


Infraorder + Superfamily + Family + Subfamily + Scientific name?
- black/white stripe equal on tail
- white eye stripe touch mouth
- hexogonal blotches
- East Socal
Alethinophidia, Colubroidea, Viperidae, Crotalinae
Crotalus atrox
Diamond-back rattlesnake


Infraorder + Superfamily + Family + Subfamily + Scientific name?
- reddish
- divided infralabial
- light edge diamond
- white band doesnt touch mouth
- west socal
Alethinophidia, Colubroidea, Viperidae, Crotalinae
Crotalus ruber
Red diamond rattlesnake


Infraorder + Superfamily + Family + Scientific name?
- 8 upper/9 lower labial
- 7>6 on upper
- pointier
- dorsal + lateral stripes
Alethinophidia, Colubroidea, Colubridae
Thamnophis atratus
Aquatic garter snake


Infraorder + Superfamily + Family + Scientific name?
- checkered
- 6>7 upper labial
- no dorsal stripe
Alethinophidia, Colubroidea, Colubridae
Thamnophis couchii
Sierra garter snake


Infraorder + Superfamily + Family + Scientific name?
- equal chin shields
- 8 upper/10 lower labial
- not pointed internasal
- no pointed nose
Alethinophidia, Colubroidea, Colubridae
Thamnophis elegans
Western terrestrial garter snake


Infraorder + Superfamily + Family + Scientific name?
- 7 upper/10 lower labial
- chin shields longer
Alethinophidia, Colubroidea, Colubridae
Thamnophis sirtalis
Common garter snake


Infraorder + Superfamily + Family + Scientific name?
- jumbled striping
- wider nose
Alethinophidia, Colubroidea, Colubridae
Nerodia sipedon
Northern Watersnake


Infraorder + Superfamily + Family + Scientific name?
- narrow nose
- consistent banding
- dark eye stripe
Alethinophidia, Colubroidea, Colubridae
Nerodia fasciata
Banded water snake


Infraorder + Superfamily + Family + Scientific name?
- green and yellow belly
- Larger eyes
Alethinophidia, Colubroidea, Colubridae
Coluber constricter
Eastern racer


Infraorder + Superfamily + Family + Scientific name?
- 2 lateral stripes
- no dorsal stripe
Alethinophidia, Colubroidea, Colubridae
Coluber lateralis
Striped racer


Infraorder + Superfamily + Family + Scientific name?
- reddish with black crossbar on neck
- no stripe
- long tail
Alethinophidia, Colubroidea, Colubridae
Coluber flagellum
Coachwhip


Infraorder + Superfamily + Family + Scientific name?
- many striped
- no dorsal
Alethinophidia, Colubroidea, Colubridae
Coluber taeniatus
Striped whipsnake


Infraorder + Superfamily + Family + Scientific name?
- black/white bands
- white larger toward stomach
Alethinophidia, Colubroidea, Colubridae
Lampropeltis californiae
CA kingsnake


Infraorder + Superfamily + Family + Scientific name?
- red in middle of black
Alethinophidia, Colubroidea, Colubridae
Lampropeltis zonata
Mountain kingsnake


Infraorder + Superfamily + Family + Scientific name?
- No pattern on stomach
- pointier head
- smooth scales
Alethinophidia, Colubroidea, Colubridae
Arizona elegans
Glossy snake


Infraorder + Superfamily + Family + Scientific name?
- rounder head
- keeled scales
Alethinophidia, Colubroidea, Colubridae
Pituophis catenifer
Gopher snake


Infraorder + Superfamily + Family + Scientific name?
- saddle bands
- overbite
Alethinophidia, Colubroidea, Colubridae
Chionactis occipitalis
Shovel-nosed snake


Infraorder + Superfamily + Family + Scientific name?
- speckled black saddles
- checkered
Alethinophidia, Colubroidea, Colubridae
Rhinocheilus lecontei
Long-nosed snake


Infraorder + Superfamily + Family + Scientific name?
- larger + striped
- heart nose
- anal scale split
Alethinophidia, Colubroidea, Colubridae
Salvadora hexalepis
Patch-nosed snake


Infraorder + Superfamily + Family + Scientific name?
- triangle nose
- spotted
- anal scale whole
Alethinophidia, Colubroidea, Colubridae
Phyllorhynchus decurtatus
Leaf-nosed snake


Infraorder + Superfamily + Family + Scientific name?
- ring on neck
- spotted belly
Alethinophidia, Colubroidea, Colubridae
Diadophis punctatus
Ring-necked snake


Infraorder + Superfamily + Family + Scientific name?
- black head
- no spots on belly
Alethinophidia, Colubroidea, Colubridae
Tantilla planiceps
Western black-headed snake


Infraorder + Superfamily + Family + Scientific name?
- black white bars on ventral
- sharp spine
Alethinophidia, Colubroidea, Colubridae
Contia tenuis
Sharp-tailed snake


Infraorder + Superfamily + Family + Scientific name?
- dark blotched neck
- brown/blotchy
- horizontal eye stripe
- cat eyes
Alethinophidia, Colubroidea, Colubridae
Hypsiglena ochrorhyncha
Night snake


Infraorder + Superfamily + Family + Scientific name?
- V pattern head
- cat eyes
- dark neck
Alethinophidia, Colubroidea, Colubridae
Trimorphodon biscutatus
Lyresnake


Infraorder + Superfamily + Family + Scientific name?
- finny tail
- no loreal scale
Alethinophidia, Colubroidea, Elapidae
Hydrophis platurus
Yellow bellied sea snake

Serpentes characteristics
short tail
limbless
left lung absent/greatly reduced
no external ears
no moveable eyelids