Latrodectus mactans

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Related to Latrodectus mactans: Latrodectus hesperus, Latrodectus variolus


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.
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
References in periodicals archive ?
Koch, 1841 USA V USA P Latrodectus hasselti Thorell, 1870 Australia V Australia V Australia V Australia P Australia p Australia OE Australia P Australia P Australia V Australia V Australia V Australia OE Australia P Latrodectus hesperus Chamberlin & Ivie, 1935 USA OE USA OE USA P USA OE USA OE Latrodectus mactans (Fabricius, 1775) USA OE Latrodectus sp.
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.
Donnees histochimiques sur les glandes sericigenes de la veuve noire Latrodectus mactans Fabr.(Araneae, Theridiidae).
Evidence of insemination of multiple females by the male black widow spider, Latrodectus mactans (Araneae, Theridiidae).
Evidence of Insemination of multiple females by the male black-widow spider, Latrodectus mactans (Araneae, Theridiidae).