Dispholidus typus
Dispholidus  typus  ( Boomslang )  [ Original photo copyright © Dr Julian White ]
Family: Colubridae
Subfamily: Colubrinae
Genus: Dispholidus
Species: typus
Subspecies: typus , punctatus , kivuensis
Common Names
Boomslang , Common African Tree Snake , Kivu Boomslang ( D. t. kivuensis ) , Kivu Large Green Tree Snake ( D. t. kivuensis )
Local Names
Gewone Boomslang , N'dlondlo , Coracundu , Ikumbu , Oparissa , Ngole , Bukizi
Sub-Saharan Africa
Angola, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Central African Republic, Democratic Republic of Congo, Cote d'Ivoire ( Ivory Coast ), Djibouti, Eritrea, Ethiopia, Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Liberia, Malawi, Mali, Mozambique, Namibia, Nigeria, Rwanda, Senegal, Sierra Leone, South Africa, Sudan, Swaziland, Tanzania, Togo, Uganda, Zambia, Zimbabwe, Mauritania, Cabinda, Somalia
Taxonomy and Biology
Adult Length: 1.35 m
General Shape
Large in length, moderately laterally compressed, elongate, slender bodied snake with a long and slender tail. Can grow to a maximum of about 2.13 metres. Head is oval shaped when viewed from above but distinct from slender neck, crown is convex, snout is short with a distinct canthus. Eyes are very large in size with round ( a slight anterior prolongation present ) pupils. Dorsal scales are narrow, small, leaf-like with a dry appearance, imbricate, distinctly keeled and with apical pits. Dorsal scale count usually 25 ( 21 to 25 ) - 19 ( 17 to 21 ) - 13 ( 11 or 15 ).
Open bush, savanna and sparsely wooded grassland. Not found in the Congo basin rainforest, arid regions or montane grasslands.
Diurnal and arboreal seldom venturing to the ground. A very timid snake which will try to escape if disturbed. If cornered it will inflate its neck to a marked degree and display its bright colouration and strike with vigour. It has excellent vision and hunts for prey during the day. It remains motionless when it first notices potential prey and awaits the opportunity to strike swiftly if within range, or pursue its prey through the foliage.
Mainly chameleons and birds and other small vertebrates. Often raids birds nests. Prey is seized, held tightly in the jaws and chewed until the venom takes effect
Species Map
Small (Approx 20k) version
Average Venom Qty
15.2 mg ( dry weight ), Grasset and Schaafsma (1940) ( Ref : R000611 ).

2.5 mg ( dry weight ), Robertson and Delpierre (1969) ( Ref : R000615 ).

4 to 8 mg ( dry weight ), Minton (1974) ( Ref : R000504 ).

0.5 to 1.0 mg ( dry weight ), Minton and Minton (1980) ( Ref : R000613 ).

1.0 to 17.0 mg ( dry weight ), Spawls and Branch (1995) ( Ref : R000704 ).
General: Venom Neurotoxins
Not present
General: Venom Myotoxins
Not present
General: Venom Procoagulants
Mixture of procoagulants
General: Venom Anticoagulants
Possibly present
General: Venom Haemorrhagins
Probably present
General: Venom Nephrotoxins
Not present
General: Venom Cardiotoxins
Not present
General: Venom Necrotoxins
Not present
General: Venom Other
Not present or not significant
Clinical Effects
General: Dangerousness
Severe envenoming possible, potentially lethal
General: Rate of Envenoming: Unknown but likely to be moderate
General: Untreated Lethality Rate: Unknown but may cause major envenoming
General: Local Effects
Local pain, swelling & bruising
General: Local Necrosis
Not likely to occur
General: General Systemic Effects
Variable non-specific effects which may include headache, nausea, vomiting, abdominal pain, diarrhoea, dizziness, collapse or convulsions
General: Neurotoxic Paralysis
Unlikely to occur
General: Myotoxicity
Not likely to occur
General: Coagulopathy & Haemorrhages
Common, moderate to severe coagulopathy + haemorrhagins causing extensive bleeding
General: Renal Damage
Recognised complication, usually secondary to coagulopathy
General: Cardiotoxicity
Unlikely to occur
General: Other
Not likely to occur
First Aid
Description: First aid for potentially dangerous non-front-fanged colubroid snakes (see listing in Comments section).
1. After ensuring the patient and onlookers have moved out of range of further strikes by the snake, the bitten person should be reassured and persuaded to lie down and remain still. Many will be terrified, fearing sudden death and, in this mood, they may behave irrationally or even hysterically. The basis for reassurance is the fact that many venomous bites do not result in envenoming, the relatively slow progression to severe envenoming (hours following elapid bites, days following viper bites) and the effectiveness of modern medical treatment.
2. The bite wound should not be tampered with in any way. Wiping it once with a damp cloth to remove surface venom is unlikely to do much harm (or good) but the wound must not be massaged.
3. All rings or other jewellery on the bitten limb, especially on fingers, should be removed, as they may act as tourniquets if oedema develops.
4. If the bite is on a limb, a broad bandage (even torn strips of clothing or pantyhose) should be applied over the bitten area at moderate pressure (as for a sprain; not so tight circulation is impaired), then extended to cover as much of the bitten limb as possible, including fingers or toes, going over the top of clothing rather than risking excessive limb movement by removing clothing. The bitten limb should then be immobilised as effectively as possible using an extemporised splint or sling.
5. If there is any impairment of vital functions, such as problems with respiration, airway, circulation, heart function, these must be supported as a priority. In particular, for bites causing flaccid paralysis, including respiratory paralysis, both airway and respiration may be impaired, requiring urgent and prolonged treatment, which may include the mouth to mask (mouth to mouth) technique of expired air transfer. Seek urgent medical attention.
6. Do not use Tourniquets, cut, suck or scarify the wound or apply chemicals or electric shock.
7. Avoid peroral intake, absolutely no alcohol. No sedatives outside hospital. If there will be considerable delay before reaching medical aid, measured in several hours to days, then give clear fluids by mouth to prevent dehydration.
8. If the offending snake has been killed it should be brought with the patient for identification (only relevant in areas where there are more than one naturally occurring venomous snake species), but be careful to avoid touching the head, as even a dead snake can envenom. No attempt should be made to pursue the snake into the undergrowth as this will risk further bites. In Australia and parts of New Guinea, Snake Venom Detection Kits are available to identify the snake from venom left on the skin.
9. The snakebite victim should be transported as quickly and as passively as possible to the nearest place where they can be seen by a medically-trained person (health station, dispensary, clinic or hospital). The bitten limb must not be exercised as muscular contraction will promote systemic absorption of venom. If no motor vehicle or boat is available, the patient can be carried on a stretcher or hurdle, on the pillion or crossbar of a bicycle or on someone's back.
10. Most traditional, and many of the more recently fashionable, first aid measures are useless and potentially dangerous. These include local cauterization, incision, excision, amputation, suction by mouth, vacuum pump or syringe, combined incision and suction ("venom-ex" apparatus), injection or instillation of compounds such as potassium permanganate, phenol (carbolic soap) and trypsin, application of electric shocks or ice (cryotherapy), use of traditional herbal, folk and other remedies including the ingestion of emetic plant products and parts of the snake, multiple incisions, tattooing and so on.
Treatment Summary
Bites cause potentially severe, even lethal coagulopathy and require urgent assessment & treatment. Antivenom, though often difficult to obtain, is the most effective treatment for the coagulopathy.
Key Diagnostic Features
Local pain, swelling, blood blisters + coagulopathy & haemorrhage
General Approach to Management
All cases should be treated as urgent & potentially lethal. Rapid assessment & commencement of treatment including appropriate antivenom (if indicated & available) is mandatory. Admit all cases.
Antivenom Therapy
Antivenom is the key treatment for systemic envenoming. Multiple doses may be required.
1. Antivenom Code: SAfSAI05
Antivenom Name: SAIMR Boomslang Antivenom
Manufacturer: South African Vaccine Producers (Pty) Ltd
Phone: +27 11 386-6000; +27 11 386-6078
Address: Postal address
PO Box 28999
Sandringham 2131
Gauteng Province

Physical address
1 Modderfontein Road
Sandringham, Johannesburg
Country: South Africa
Dispholidus typus ( Boomslang ) [ Original photo copyright © Dr Julian White ]