Western black widow
The western black widow is a venomous spider that lives in western North America. The female is black, often with a red hourglass mark on her belly, and her webs are tangled and irregular. Her venom is strong, so it is worth knowing what she looks like.1

Kako ga prepoznati
- The female is about 14–16 mm long and black, often with an hourglass-shaped mark on the lower abdomen.1
- The hourglass mark is usually red, but it can be yellow and, very rarely, white.1
- The male is about half the female's length and is generally beige, with lighter striping on the abdomen.1
- Its webs are irregular or tangled, with no obvious overall pattern.1
Često se miješa s: It was once described as a subspecies of Latrodectus mactans and is closely related to the northern species Latrodectus variolus.1
Otrovna snaga
Otrov izlazi kroz očnjake ili zube kad ugrize.
Što radi njegov otrov kad ugrize ili ubode?
The female's venom contains a neurotoxin called α-latrotoxin, which attacks the nerves. In humans, its symptoms include pain, nausea, vomiting, goosebumps and localised sweating.1
Koliko je opasno za ljude?
Opasnost za ljude: OzbiljnoUgriz treba pokazati liječniku. Smrtni slučajevi su vrlo rijetki.Historical reports gave fatality rates between 0.5% and 12%. However, recent studies have not been able to confirm any deaths from the U.S. species of Latrodectus, including zero deaths among 23,409 documented bites from 2000 through 2008.1
Što radi kad se uplaši?
Juveniles and females can fling a sticky ball of silk at predators, which can stop most of them.1
Ako ugrize
- Operi ugriz i stavi na njega vrećicu leda protiv boli. Potraži liječničku pomoć ako je bol jaka, širi se ili se osoba osjeća loše.
Uvijek prvo nazovi broj za hitne slučajeve (112, 000, 911). Ovo su opće upute za prvu pomoć, a ne liječnički savjet. Osnove prve pomoći
Ostani na sigurnom
- Nikad ne diraj, ne hvataj i ne zadirkuj divlju životinju, čak ni malu, i čak ni ako izgleda kao da spava ili je mrtva.
- Ostavi joj prostora. Ako je sretneš, ne paniči, polako se odmakni i pusti je da ode svojim putem.
- Ako te neka ugrize: ne paniči, miruj, nazovi broj za hitne slučajeve (112, 000, 911) ili brzo idi u bolnicu. Zapamti kako je izgledala, fotografija pomaže.
Ne želi ti ništa loše. Otrov koristi za lov hrane ili za obranu i mnogo bi se radije sakrilo. Više o sigurnosti
Koliko je veliko?
Koliko je dugo?
kraće od tvog malog prstaKoliko je Western black widow velika životinja u usporedbi s TOBOM?
Samo matematika u tvom pregledniku. Ništa se ne sprema niti šalje nikamo.
Koliko je brzo?
Činjenice
When prey hits a gumfoot thread, the thread breaks and creates tension that pulls the line and prey up to the spider.1
This spider is an opportunistic cannibal, and it may eat other members of its own kind when prey is scarce, when it is very hungry, or in self-defence.1
The silk is strongly sticky, and its strength is similar to that of silk from orb-weaving spiders.1
Males can be preferred by females based on the webs, with well-fed females chosen over starved ones.1
Males may mate several times during their relatively short lives.1
Razbijač mitova
Mit: A black widow bite is usually deadly.
Istina: Recent studies have not confirmed any deaths from the U.S. species of Latrodectus, including zero deaths among 23,409 documented bites from 2000 through 2008.1
Odakle su činjenice
- Latrodectus hesperus (Wikipedia (CC BY-SA 4.0))
- Latrodectus hesperus (iNaturalist): imena i klasifikacija.
- Venom Wiki: razina opasnosti, tipična veličina i procijenjena brzina naše su. Pogledaj kako ih izračunavamo: Kako ocjenjujemo opasnost.
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