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3- The Baja blue rock lizard (Petrosaurus thalassinus)
Male Petrosaurus thalassinus eating flower from hand
The Baja blue rock lizard (Petrosaurus thalassinus) is a species of large, diurnal phrynosomatine lizard.
Baja blue rock lizard
Conservation status :
Least Concern (IUCN 3.1)
Scientific classification :
Binomial name :
Uta thalassina Cope, 1863
Petrosaurus thalassinus - Boulenger, 1885
It reaches up to 45 cm (18 in) long including the tail, and has a flattened body with small, smooth, granular scales and slightly keeled scales near the tail. The head is bluish with red to orange colors around the eyes, yellow neck with blue spots and streaks. The back of the tail is gray blue with darker cross bars. The coloration intensifies during the breeding season in both sexes.
It prefers temperatures in excess of 90 °F and basks in direct sunlight on desert rocks. A very wary species, its flattened body allows it to quickly retreat into rock crevices to escape predators as well as inclement weather conditions. When threatened, it can extend a skin flap along its throat. Like many lizards, it is able to drop its tail when caught.
It feeds on various insects, small lizards, blossoms, leaves, seeds, and small fruit. Occasional incidents of cannibalism on smaller individuals have been observed.
Two subspecies are recognized within P. thalassinus; P. t. thalassinus inhabits the Cape region, and P. t. repens ranges north of the isthmus of La Paz. P. t. repens differs by having a thin, black, postorbital stripe; one row of scales between the nasal and the supralabials as opposed to two, and reaching a maximum snout-to-vent length of 111 mm as opposed to 162 mm. Genetic studies indicate all populations within P. thalassinus, including the two subspecies, show only low levels of genetic divergence, indicative of high rates of gene flow. In contrast, P. thalassinus is strongly differentiated from its sister species P. mearnsi.
Life History :
Breeding takes place in the spring. 20 to 30 eggs are laid in late spring and summer, and hatchlings appear after 85 to 88 days in summer and early fall. Sexual maturity is reached after about 2 years with a life expectancy of 20 years.
P. thalassinus is most often found in the immediate vicinity of rocky canyons, boulder-strewn hillsides and arroyo bottoms and sea-side cliffs. These lizards appear to be particularly common on rocks near large trees or other vegetation, and rarely seen in areas where vegetation is non-existent.
Geographic range :
It is found in the Sierra la Laguna (and its associated ranges) and Sierra la Trinidad of the Cape region of Baja California Sur, as well as on Islas Espiritu Santo and Partida Sur in the Gulf. Elevational distribution from sea level to 2,020 meters in the Sierra la Laguna.
This species is locally abundant and occurs on several protected islands. It is currently in no need of special protection. However, its small range may make it vulnerable to disturbance.
Baja blue rock lizard
Other websites :
keeping & Breeding info :
- Petrosaurus thalassinus keeping & breeding at BION Terrarium Center
courtesy to : www.bion.com.
by Dmitri Tkachev & Ivan Neizhko
The colorful medium size Blue iguana (Petrosaurus thalassinus) in habits rocky slopes across Californian Bay up to 2000m above sea level. Their distribution area includes ocean cost around Mexican board + neighboring islands and is pretty small.
Despite high demand of this species on reptile’s market the supply is always limited.
We keep Petrosaurus thalassinus in BION Terrarium Center since 2006.
For October 2014 ourfoundstock consists of:
- One adult pair (1:1)
- Four young pairs c.b. 2013 (4:4) – should be ready for breeding in 2015
- 17 unsex babies from Dutch breeder unrelated line
The details of keeping
Terrarium: For adult pair (1:1) we use horizontal type terrarium 100x60x50 cm. Babies and young lizards are kept in terrariums 60x40x40 cm. Pls see the pictures.
Substrate: sand mixed with clay.
Decoration: Rocks, bark, cork for climbing, artificial rocks from gypsum.
Lighting : Full spectrum lamp; 14 hours at summer, 8 hours at winter.
Heating: 100 watt lamp for adults and 60 watt lamp for juveniles , 14 hours at summer (depends on the temperature in the terrarium), 8 hours at winter.
UV: Full spectrum Zoo Med lamp “Reptisun UV.10”; 14 hours at summer, 8 hours at winter.
Temperature: Day t - 26-28°C (basking place – up to 45°C), night - 20-22°C.
Humidity: During breeding season (February – June) - 70% is achieved by intensively spraying of enclosure with decoration 2 times per day. Starting July - 50-60 %.
Diet: For adults: crickets, roaches, zophobas, mealworms. We provide “live food” 3 times per week by 3-4 insects per head. Also salad is provided 3 times per week. Summer: dandelion, nettle, clover, plantain, leaves of cultivated grapes. Winter: chinese cabbage, different kinds of green salads, parsley, celery, carrot.
Mineral supplements:Each feeding we sprinkle insects with calcium (especially it’s important for babies and pregnant females). We use Reptical.
Vitamins we provide 1 time per week for all animals:
Repashi for babies and adults – 1 time per week.
Mineral all – 1 time per week.
Males and females reach their sexual maturity around 18 months.
We keep adult lizards in pairs (1:1), also possible to keep in groups (1:2).
Hibernation is from the beginning of November till the end of January. The temperature that time is 18°C. No lighting. Fresh water is available all the time. Humidity is low - 50%.
Mating observed in January. Pregnancy takes about 1-1.5months. Females dig their eggs in cacapacity with wet sand. Eggs are incubated in a moist vermiculite (medium fraction) . With temperature 28-29°C incubation takes 50-60 days
- In 2012 we got 4 babies from a singlefemale (1 clutch of 6 eggs total)
- In 2013 we got 23 babies from asingle female (1 clutch of 23 eggs total)
- In 2014 we got 1 unfertilized clutch from asingle female.
The conditions are same as for adults, taking in consideration the size of enclosure and the size of insects for food.
Diet: crickets, roaches, zophobas, mealworms. We provide “live” food corresponding size 3 times per week by 3-4 insects per head. Salad is recommended in small quantities, also 3 times per week.
For all babies 2 months old we give Reptivit with D3 and Reptivit without D3.
Very important: providing UV, Vitamins and mineral supplements on a regular base.
We recommend keeping babies one by one (maximum 2 in one place).
Important! The required temperature air: day 26-30 °C and 15-22°C at night.
Young lizards can bite each other if they kept all together. In this case you need to treat the bitten place with hydrogen peroxide, and then apply veterinary ointment Mastijet® Forte to the wound. Use the ointment every other day until a crust on the wound. THE LAST BUT NOT LEAST – immediately separate them to avoid further problems.
Femelle Petrosaurus Thalassinus
Petrosaurus thalassinus - (Cope, 1863) - (Phrynosomatidae) - Lézard bleu des rochers - 01/09/2016
Petrosaurus thalassinus hatchlings
Baja blue rock lizard.
Baja Blue Rock Lizard
Baja blue rock lizard