© Robert Siegel
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Garter snakes

Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Genus: Thamnophis

Species on the page

+ San Francisco garter (Thamnophis sirtalis tetrataenia)
+ Common garter (Thamnophis sirtalis) - intergrade species
+ Coast garter (Thamnophis elegans terrestris)
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San Francisco garter (Thamnophis sirtalis tetrataenia)

Garters of the environnment

sf garter

San Francisco garter snake
Thamnophis sirtalis tetrataenia

There are an estimated 1000 to 2000 of this endangered subspecies. On this outing, we spotted four of them in two groups of two.

Etymology: the genus name is derived from the Greek roots thamnos for bush and ophio for snake.
"Sirtalis" is derived from the Latin for garter and apparently refers to the dorsal stripe(s).
The subspecies name is derived from the Greek roots tetra for four and taenia for ribbon.
The latter is also a genus of tapeworm including several human pathogens.

Año Nuevo
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Another view

Año Nuevo

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The garter of SF

SF garter
San Francisco garter snake
Año Nuevo
July 20 2014

OK, so this is not the greatest SF garter picture.
But it does have a great story. See below
(Also it is my first garter picture of the year.)

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Ophidian adornment

SF garter tatoo
This is the woman who spotted the snake (or at least her arm.).
She had a San Francisco garter snake tatoo - though she had never seen one before!
She found this young specimen right by the sign indicating where they hang out.
Although the snake is brightly colored and was only a few feet away, it was incredibly well-camoflaged - even when she pointed it out.

She claimed she looked carefully on her way out to the point, but did not see anything.
On the way back, her GPS on her phone started to give her audible instructions - she realized she had forgotten to turn off the sound.
Her phone instructed her to go 1000 feet forward on the trail - which took her right back to the SF garter snake sign by the pond.
She figured she better carefully look again - and that is when she spotted it.

Año Nuevo
July 20 2014

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Common garter (Thamnophis sirtalis) likely intergrade

Garter

bioblitz2015

Lagunita
April 18, 2015

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Garter

bioblitz2015

Lagunita
April 18, 2015

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Garter in hand

bioblitz2015

Lagunita
April 18, 2015

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Coast garter (Thamnophis elegans terrestris)

Garter close

coast garter
Coast garter (Thamnophis elegans terrestris)
Pigeon Point
February 21, 2015
ID per Cindy Rocha

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Closer

coast garter
Pigeon Point
February 21, 2015

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Peek-a-boo

san francisco garter
Pigeon Point
February 21, 2015

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On the move

san francisco garter
Pigeon Point
February 21, 2015

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In its entirety

san francisco garter
Pigeon Point
February 21, 2015

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Families

+ Colubridae
+ Boidae
+ Viperidae
+ Elapidae
+ Misc
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modified: February 27, 2015
created: February 24, 2015 (from snakes.html)
Contact: siegelr@stanford.edu
All pictures are protected by copyright. Do not use without permission.