Viperidae
Whitetail Lancehead
VenomousBothrops leucurus






6 photographs of the Whitetail Lancehead. © Pedro Alvaro Neves.
The Whitetail Lancehead (Bothrops leucurus) is a venomous snake in the Viperidae family, recorded in 2 countries.
If you are bitten
This is a venomous snake. Treat any bite as a medical emergency: stay calm, keep the bitten limb still and roughly level with the heart, remove rings and tight clothing, and get to emergency care immediately. Do not apply a tourniquet, cut the wound, apply ice, or try to suck out venom. Call your local emergency number or poison center.
- Family
- Viperidae
- Danger
- high
About the Whitetail Lancehead
Bothrops leucurus, commonly known as the whitetail lancehead or the Bahia lancehead, is a species of venomous snake, a pit viper in the family Viperidae. The species is endemic to Brazil. There are no subspecies which are recognized as being valid. A female owned by YouTuber Venom Central is over six feet long.
Etymology
The specific name, leucurus, meaning "whitetail", is from the Latin words leucus (white) and urus (tail).
The specific name, pradoi, of the junior synonym Trimeresurus pradoi, is in honor of Brazilian herpetologist Alcides Prado.
Description and Behavior
The color varies from tan to reddish-brown, the pattern varies, from darker and lighter spots, similar to light diagonal dorsolateral lines. It has 23 to 31 rows of dorsal scale of the medium body, the belly is yellowish or whitish in color with dark, brown or gray spots, and irregular spots on the sides. It is a snake with terrestrial behavior, growing on average in 250–1840 mm, mainly found in forests, arid, semi-arid, dry, humid and sub-humid regions.
Geographic range
Bothrops leucurus is found in eastern Brazil along the Atlantic coast from northern Espírito Santo north to Alagoas and Ceará. It occurs more inland in several parts of Bahia. The identity of disjunct populations west of the Rio São Francisco is uncertain. The type locality is listed as "provinciae Bahiae". It inhabits both urban and rural areas.
Reproduction
Bothrops leucurus is viviparous. The gestation period is four months, and a medium-sized litter is 19 young, birth occurs between winter and summer.
Diet
It feeds on rodents, lizards, amphibians, snakes and birds (Martins et al., 2002). with adults feeding on rodents, and juveniles feeding on frogs and lizards.
Venom
The whitetail lancehead is responsible for the most bites in the state of Bahia. The venom contains high fibrinolytic, proteolytic, hemorrhagic and edematogenic activity, and low coagulant activity, which can cause myonecrosis in humans. Symptoms include local pain, edema, erythema and ecchymosis (local symptoms), hemorrhagic and coagulation symptoms, digestive disorders (nausea, vomiting and diarrhea), urinary disorders (oliguria, anuria, hematuria) with headaches, dizziness, hypotension, bradycardia, visual disturbances and tremors.
Adapted from Wikipedia, available under CC BY-SA.
Frequently asked: Whitetail Lancehead
- Is the Whitetail Lancehead venomous?
- Yes. The Whitetail Lancehead (Bothrops leucurus) is venomous and belongs to the Viperidae family (viper). Its bite is considered high risk to people. Treat any bite as a medical emergency.
- Is the Whitetail Lancehead poisonous?
- Snakes are venomous, not poisonous. "Poisonous" means harmful to eat or touch; "venomous" means injecting toxins through a bite. The Whitetail Lancehead is venomous, delivering venom through a bite.
- Is the Whitetail Lancehead dangerous?
- This is a venomous snake. Treat any bite as a medical emergency: stay calm, keep the bitten limb still and roughly level with the heart, remove rings and tight clothing, and get to emergency care immediately. Do not apply a tourniquet, cut the wound, apply ice, or try to suck out venom. Call your local emergency number or poison center.
- Where does the Whitetail Lancehead live?
- The Whitetail Lancehead has verified records in 2 countries, including Brazil, Costa Rica. See the distribution section below for its full range.
- What does the Whitetail Lancehead eat?
- It feeds on rodents, lizards, amphibians, snakes and birds (Martins et al., 2002). with adults feeding on rodents, and juveniles feeding on frogs and lizards.
- Why is it called the Whitetail Lancehead?
- The specific name, leucurus, meaning "whitetail", is from the Latin words leucus (white) and urus (tail). The specific name, pradoi, of the junior synonym Trimeresurus pradoi, is in honor of Brazilian herpetologist Alcides Prado.
If you are bitten by the Whitetail Lancehead
Do
- Get away from the snake and stay calm. Most bites worsen when people panic or try again to handle the snake.
- Call 911 or Poison Control (1-800-222-1222) right away. Antivenom works best when given early.
- Note the time of the bite and, from a safe distance, the snake's color and pattern, a phone photo is enough. Do not chase it.
- Keep the bitten limb still and at roughly heart level. Sit or lie down and limit movement.
- Remove rings, watches, and tight clothing near the bite before swelling starts.
- Gently wash the bite with soap and water and cover it with a clean, dry dressing.
Do not
- Do not cut the wound or try to suck out the venom.
- Do not apply a tourniquet or ice.
- Do not drink alcohol or caffeine.
- Do not take aspirin or ibuprofen, they can worsen bleeding. Acetaminophen is safer for pain.
- Do not try to catch or kill the snake. A dead snake can still bite by reflex.
First-aid guidance adapted from the U.S. Centers for Disease Control and Prevention (CDC NIOSH), Venomous Snakes. Educational only; always follow the instructions of emergency responders.
Where it is found
More Viperidae snakes
Classification
How scientists group this snake, from the broadest category down to the exact species. Each step narrows to its closest relatives.
Keep learning
- Are Snakes Dangerous? The Real Risk, in PerspectiveMost snakes are harmless and avoid people. Here is the honest picture of snakebite risk worldwide and how to lower your own.
- Snakebite First Aid: What to Do (and What Never to Do)A clear, CDC-based guide to snakebite first aid: the steps that help, the popular myths that hurt, and how to tell a serious bite from a minor one.
- Venomous vs Nonvenomous: How to Tell the DifferenceThe folk rules for telling venomous snakes apart, where each one fails, and why location-based identification beats guessing by sight.
- What to Do If You Find a SnakeFound a snake at home or on a trail? Here is how to stay calm, give it space, identify it safely, and know when to call a professional.
Distribution from GBIF & iNaturalist. Venom status per CDC. Background: Wikipedia. Informational only. Never handle a snake to identify it.







