Latrodectus mactans


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Related to Latrodectus mactans: Latrodectus hesperus, Latrodectus variolus

Latrodectus

 [lat″ro-dek´tus]
a genus of poisonous spiders. L. mac´tans is the black widow spider. See also spider bite.
Latrodectus mac´tans a species found in the United States; commonly known as the black widow. Its bite may cause severe symptoms or even death. (For first aid, see spider bite.)

La·tro·dec·tus mac·'tans

the black widow spider, a venomous jet-black spider found in protected dark places; it is especially common in the southern U.S.; the full-grown female (slightly more than 1 cm long) has a brilliant red dumbbell- or hourglass-shaped mark on the ventral aspect of the abdomen; her bite may be extremely painful, producing a syndrome mimicking an acute abdominal crisis; some deaths, though rare, have been reported, particularly in small children; the male spider lacks the hourglass mark and is not venomous.

Latrodectus mactans

A venomous spider indigenous to North America—most bites occur in California, most commonly in summer. The black widow spider measures 13 mm in length with a leg spread of 40 mm; it bites with its anterior fangs and may be fatal in very young children and older adults
Management Supportive—topical cleansing, ice, aspirin, opiate analgesics, hot baths, mild sedation, bed rest; for muscle spasms, calcium gluconate, methocarbamol or phenadrine; for hypertensive crises, short-acting antihypertensives; antivenin-Lyovac may be indicated in some patients

Latrodectus

a genus of poisonous spiders belonging to the dipneumomorph family Theridiidae.

Latrodectus hasseltii
the Australian redback spider, an ecological variant of L. mactans and with the same toxicity.
Latrodectus mactans
a species found in the United States; commonly known as the black widow. In New Zealand called katipo. Satiny black with a broad sagittal red stripe in the female, which is venomous. Its bite may cause severe local pain and general paralysis.
References in periodicals archive ?
Key words: Latrodectus mactans, spider venom, smooth muscle, calcium channels, sodium/calcium exchanger.
La arana Latrodectus mactans de Chile (Zapfe 1959), perteneciente al genero Latrodectus Walckenaer, 1805 mundialmente distribuido, conocida como "arana del trigo" o "viuda negra", habita en diversas regiones del pais.