Micrurus frontalis, also known as the southern coral snake or short-tailed coral snake, is a species of highly venomous coral snake in the family Elapidae.[2] It is found in South America.[1][2]
| Micrurus frontalis | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Elapidae |
| Genus: | Micrurus |
| Species: | M. frontalis
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| Binomial name | |
| Micrurus frontalis | |
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Description
editThis species grows on average to 75 cm in length, with a maximum of 164 cm already reported.[3] The color of the head varies, with a gray pigment on the top of the snout. The body pattern consists of very wide red bands that are separated by a series of 10–15 narrower black triads with 3 blacks separated by narrow white bands. The dorsal scales are red, with black tips of dark appearance. The tail has two complete triads.
It is a nocturnal, terrestrial and fossorial snake, which digs loose soil or litter, has been one of the main accident-causing corals in Southeast South America, although it is not relatively aggressive towards humans, it has Oviparous reproduction, although eggs / clutch has not been reported.[4]
Distribution and habitat
editMicrurus frontalis is found in south-central Brazil, Paraguay, and northern Argentina.[1][2] It mainly lives in humid forests, tropical and subtropical deciduous forests, savannas, sandy and rocky areas, in secondary vegetation such as pastures and agricultural land, close to marshes and streams, it inhabits lowlands, from sea level to an elevation of 700 m.[4]
Diet
editIt feeds on lizards and other snakes (including blind snakes).[3] Cannibalism has been reported in this species.[4]
Venom
editLike all elapids in Brazil, Micrurus frontalis has post-synaptic neurotoxins (except for Micrurus corallinus) that bind to terminal motor acetylcholine receptors, the toxin is composed of low molecular weight polypeptides, which are rapidly absorbed by the body after inoculation and symptoms can appear in minutes, the toxin acts peripherally, blocking neuromuscular transmission. Muscle paralysis is a consequence of the action of the toxin with the neurotransmitter by the nicotinic receptor on the end plate.
At the site of the bite, edema and paresthesias occur, the initial systemic symptoms of most coral accidents, include eyelid ptosis and diplopia, which are followed by facial muscle paralysis, visual impairment, anisocoria, dysarthria, dysphagia, salivation and generalized loss of muscle strength, in severe cases, life-threatening respiratory arrest occurs, with patients requiring artificial ventilation.[5] The median lethal dose is 22 μg for mice weighing 4–29 grams,[6] and 0.69 mg/kg.[7] The estimates of average yield range between 10 and 30 mg (dry weight), depending on the source.[3]
References
edit- ^ a b c Cacciali, P.; Carreira, S.; Giraudo, A.; Kacoliris, F.; Montero, R.; Scott, N. (2019). "Micrurus frontalis". IUCN Red List of Threatened Species. 2019: e.T56041084A56041101. doi:10.2305/IUCN.UK.2019-3.RLTS.T56041084A56041101.en. Retrieved 9 February 2022.
- ^ a b c Micrurus frontalis at the Reptarium.cz Reptile Database. Accessed 16 February 2016.
- ^ a b c "WCH Clinical Toxinology Resources". www.toxinology.com. Retrieved 2020-10-18.
- ^ a b c "Living Hazards Database (LHD) – Search by Scientific Name" (PDF). Living Hazards Database (LHD).
- ^ Seligman, Renato (1993). "Acidente por Micrurus frontalis: primeiro relato de envenenamento elapídico no Rio Grande do Sul" (PDF). Memórias do Instituto de Butantan (in Portuguese). 55 (2): 65–68.
- ^ Tanaka, Gabriela D.; Furtado, Maria de Fátima D.; Portaro, Fernanda C. V.; Sant'Anna, Osvaldo Augusto; Tambourgi, Denise V. (2010). "Diversity of Micrurus snake species related to their venom toxic effects and the prospective of antivenom neutralization". PLOS Neglected Tropical Diseases. 4 (3): e622 [Table 1]. doi:10.1371/journal.pntd.0000622. PMC 2834742. PMID 20231886.
- ^ Oliveira, Daysiane de (2017-08-12). Caracterização bioquímica e imunológica do veneno da serpente Micrurus surinamensis (MSc thesis) (in Brazilian Portuguese). Universidade do Extremo Sul Catarinense.
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