Thamnophis conanti: Conant’s Garter Snake


Adult female Thamnophis conantiConant’s Garter Snake is an elegant and relatively small species of Garter Snake.

It is a beautifull species with a very unique and inconspicous coloration and pattern.

It usually is quite visible in its terrarium, relatively easy to keep and generally very docile.

Young female (2 years old) Thamnophis conantiThis species was known as Thamnophis godmani untill in 2005 Rossman and Burbrink further investigated the variation within Thamnophis godmani and concluded that it consisted of four separate species, one of them being Thamnophis conanti.

Virtually nothing is known about the ecology of this montane mexican species.

It was named after the late famous herpetologist Roger Conant who wrote many publications about several of the mexican species of Garter Snakes and Water Snakes.

Length and size of Thamnophis conanti

Young female (2 years old) Thamnophis conantiThamnophis conanti can be considered a small species.

Rossman and Burbrink (2005) mention that the 10 longest adult females averaged 38,3 cm svl (snout venth length), the 10 longest males 33,7 cm.

My 2 biggest females have a SVL of 45 cm (58,5 cm TL) and 50,5 cm (64,5 cm SVL).

Adult male Thamnophis conantiMy 2 biggest males have a SVL of 41 cm (53,7 cm TL) and 40,5 cm (54,2 cm TL).

Rossman, Ford & Siegel (1996) mention a SVL of 52,0 cm as maximum reported size for the T. godmani complex (the species has been split after this book was published). So my 50,5 cm SVL female is close to the maximum size reported in literature.

They are definitely not a slender build species.

I would rather call them relatively stout bodied.

Description of Conant’s Garter Snake

Adult male Thamnophis conanti

Adult male Thamnophis conanti

Dorsal coloration of Thamnophis conanti is best described as olivegreen or light brown.

The dorsal stripe is best described as light tan and well defined. It occupies a single scale row, and sometimes part of the adjacent row.

Adult male Thamnophis conantiThe lateral stripes are of the same coloration but less defined. A double row of dark spots is usually mostly visible in the neck, and those spots can sometimes form small bars that cross the lateral stripe.

Adult male Thamnophis conantiOn the skin between the scales their are bright white and yellow spots, which are predominantly visible after feeding or when the snakes are pregnant or inflate when they feel threatened.

The top of the head is unpatterned and the nuchal blotches are predominantly brown with a black border.

Newborn baby CB (2 days old) Thamnophis conanti

The labial scales
are white and their is a typical black barring along the labial scales which is unique for the species.

The tongue is uniformly black.

Terrarium for Thamnophis conanti

Adult male Thamnophis conantiThamnophis conanti is a diurnal snake and often clearly visible in the terrarium, as long as it is not too hot. They will spend a lot of time basking below the lamp, on a branch or on the ground. This despite the fact that in the wild they do not show themselves so much in the open, at least that is my personal experience. Of course this (how much they show themselves in the terrarium) will depend a lot on how the terrarium is set up. A well ventilated cage with a good temperature gradient is important. I have a part of the terrarium with (light moist) cocopeat, the drier part under the lamp with woodchips.

Adult male Thamnophis conantiSo it is important not to keep them in a completely dry terrarium, similar to Thamnophis butleri.

It is not eaxctly known what they feed on in the wild. Rossman, Ford & Siegel (1996) mention a mouse as food item.

Young adult male(3 years old) Thamnophis conantiI give my adult Thamnophis conanti mostly pinkies, chopped up worms and thawed fish (smelt) supplemented with vitamin B1. But they seem to be most fond of pinkies and worms. Smelt is only occasionally taken. So far I am giving the newborn babies a mixture of worms, pinkie-parts and small pieces of fish. I always ad extra calcium to the worms, and supplement any smelt with Vitamin B1.

Young adult male(3 years old) Thamnophis conantiTo mimic natural circumstances on the high elevations where they occur I have kept them in my unheated shed in the winter for 6 – 8 weeks. Night temperatures dropped to 4 – 10 ⁰C at night, but a basking area provided them to bask for a few hours during daytime at maximum (local) temperatures of 30 ⁰C. But on cold days they were often hiding, sometimes for days in a row.As a minimum size for the terrarium with 1 adult couple I recommend 70 x 40 x 40 cm.

Distribution & habitat of Thamnophis conanti

Habitat of Thamnophis conanti

Habitat of Thamnophis conanti

Thamnophis conanti is only known from a relatively small area from the mountainous area (part of the vulcanic belt in central Mexico) along the stateline between Veracruz and Puebla, occuring at high elevations of approximately 2000 – 2300 meter.

Habitat of Thamnophis conantiThe habitat is relatively moist since the humid air from the gulf of Mexico is pushed higher and higher in order to cross the high mountain ranges. So despite the southern latitude you can have rainy or foggy days of only 12 ⁰C sometimes in the middle of summer.

Habitat of Thamnophis conantiOn most of the places a small pond or a dried up river bed was close by. I found them by turning rocks or debris in grassy, sunexposed areas at altitudes of 2180 – 2500 meters.

I have not found them at the borders of pools or rivers or swimming but in Rossman, Ford and Siegel (1996) this is mentioned.

Care sheet

Newborn baby CB (2 days old) Thamnophis conantiMy article on Thamnophis atratus atratus (The Santa Cruz Garter Snake) that can be found online on this website can serve as a rough guideline how to keep and breed Thamnophis conanti as well.

Newborn baby photographed in the wild Thamnophis conantiBut I intend to write more about this species soon.

Obviously there are differences with T. atratus. A true hibernation is not necessary probably, but creating low night temperatures mimic s normal winter circumstances.
Their preference for pinkies and worms needs to be considered.

Breeding Group

My breeding group consists of 6 unrelated wild caught snakes.
This gives me the opportunity to breed snakes from unrelated parents in order to minimize the change of inbreeding.

Rossman, D.A., N.B.Ford & R.A.Siegel (1996). The Garter Snakes. Evolution and ecology. University of Oklahoma Press, Norman
Rossman, D. A. & F.T. Burbrink (2005). Species limits with the Mexican Garter Snakes of the Thamnophis godmani complex. Occ. Papers Mus. Nat. Science (79): 1-43

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