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

Com reconèixer-lo
- 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
Sovint es confon amb: It was once described as a subspecies of Latrodectus mactans and is closely related to the northern species Latrodectus variolus.1
Poder del verí
El verí surt pels ullals o les dents quan mossega.
Què fa el seu verí?
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
Com de perillós és per a les persones?
Perill per a les persones: GreuUna mossegada necessita un metge. Les morts són molt rares.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
Què fa quan té por?
Juveniles and females can fling a sticky ball of silk at predators, which can stop most of them.1
Si mossega
- Renta la mossegada i posa-hi gel per al dolor. Busca ajuda mèdica si el dolor és fort, s'estén o la persona es troba malament.
Truca sempre primer al número d'emergències (112, 000, 911). Això són pautes generals de primers auxilis, no consells mèdics. Primers auxilis bàsics
Estigues segur
- No toquis, atrapis ni molestis mai un animal salvatge, encara que sigui petit i encara que sembli adormit o mort.
- Deixa-li espai. Si en trobes un, mantén la calma, recula a poc a poc i deixa que segueixi el seu camí.
- Si te'n mossega un: mantén la calma, no et moguis, truca al número d'emergències (112, 000, 911) o ves de pressa a un hospital. Recorda com era, una foto ajuda.
No va a per tu. Fa servir el verí per caçar o per defensar-se, i prefereix mil vegades amagar-se. Més sobre com estar segur
Que gran és?
Quant fa de llarg?
més curt que el teu dit petitQue gran és Western black widow comparat amb TU?
Només càlculs al teu navegador. No es desa ni s'envia res enlloc.
Com de ràpid va?
Dades
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
Desmuntamites
Mite: A black widow bite is usually deadly.
Veritat: 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
D'on surten les dades
- Latrodectus hesperus (Wikipedia (CC BY-SA 4.0))
- Latrodectus hesperus (iNaturalist): noms i classificació.
- Venom Wiki: el nivell de perill, la mida típica i la velocitat estimada són nostres. Mira com els calculem: Com valorem el perill.
Cada dada d'aquesta pàgina té un número que porta a la seva font. Si ens hem equivocat en alguna cosa, perdona, som fans dels animals, no una revista científica. Escriu-nos a [email protected] i ho arreglarem.
Mossegades

