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Isometrus maculatus
General Details, Taxonomy and Biology, Venom, Clinical Effects, Treatment, First Aid , Antivenoms
Family: Buthidae
Genus: Isometrus
Species: maculatus
Common Names
Spotted scorpion
Australia + South Pacific
Angola, Australia, Bahamas, Barbados, Botswana, Brazil, Cambodia, Cameroon, Cape Verde, Chile, China, Colombia, Democratic Republic of Congo, Republic of Congo, Costa Rica, Cuba, Ethiopia, Gabon, French Guiana, Greece, Guadeloupe, Guinea, Guinea-Bissau, Indonesia, India, Kenya, Kiribati, Laos, Malaysia, Maldives, Marshall Islands, Martinique, Mozambique, Myanmar, Nigeria, Pakistan, Palau, Papua New Guinea, Peru, Philippines, Puerto Rico, Saint Lucia, Sao Tome and Principe, Senegal, Sierra Leone, South Africa, Spain, Solomon Islands, Sri Lanka, Sudan, Suriname, Syria, Tanzania, Thailand, Togo, United States of America, Venezuela, Vietnam, Somalia, French Polynesia ( Territory )
Taxonomy and Biology
Adult Length ( mm ): 30 mm
Carapace, tergites, metasoma, pedipalps and legs are pale yellow to pale yellowish brown and variably variegated with sparse dark brown to black pigment. A darker brown to blackish pigment is present usually on extremities of cheliceral teeth and aculeus. Ventral surface and sternites are pale yellowish. Legs are yellow usually with some brown spotting.
Species Map
Small (Approx 20k) version
General: Venom Neurotoxins
General: Venom Myotoxins
General: Venom Procoagulants
General: Venom Anticoagulants
General: Venom Haemorrhagins
General: Venom Nephrotoxins
General: Venom Cardiotoxins
General: Venom Necrotoxins
General: Venom Other
Clinical Effects
General: Dangerousness
Mild envenoming only, not likely to prove lethal
General: Rate of Envenoming: Unknown but likely to be low
General: Untreated Lethality Rate: Unlikely to prove lethal
General: Local Effects
General: Local Necrosis
General: General Systemic Effects
Stings do not appear to result in significant systemic envenoming.
General: Myotoxicity
Does not occur, based on current clinical evidence
General: Coagulopathy & Haemorrhages
Does not occur, based on current clinical evidence
General: Renal Damage
Does not occur, based on current clinical evidence
General: Cardiotoxicity
Does not occur, based on current clinical evidence
General: Other
Does not occur, based on current clinical evidence
First Aid
Description: First aid for scorpion stings (in areas where no potentially dangerous species may be found)
1. Reassure the victim. Despite sometimes intense local pain, usually lasting less than one hour, these scorpions are not able to cause major of lethal envenoming and most stings will settle rapidly.
2. Do not apply a bandage or tourniquet, or cut, suck or incise the wound or apply electric shock. Neither the application of local heat or cold are proven as effective.
3. If the victim develops general symptoms or the pain remains severe after one hour, seek medical advice.
Treatment Summary
Stings cause predominantly local effects of short duration, usually not requiring medical treatment. No antivenom is available or indicated.
Key Diagnostic Features
Local pain, often severe
General Approach to Management
Most cases will be minor & not require admission.
Antivenom Therapy
No antivenom available
No Antivenoms
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