False Widow (Steatoda nobilis) Spider Bite Marks Treatment

False Widow (Steatoda nobilis) Spider Bite Marks Treatment

Noble False Widow and referred as False Widows of Steatoda genus and scientific name – Steatoda nobilis. Every autumn season reports of Steatoda spiders become uninvited houseguests in houses (across UK). Noble widow eight-legged venomous spider and one among 15 species which can bite humans.

These spiders are venomous but bite almost exclusively & severity level mild on humans. Look similar like black widows and Noble False Widows bite likely to give small or harmless bite.

Common Steatoda species –

  • Rabbit hutch spider (S. bipunctata) found commonly across the UK and found in most british gardens.
  • Cupboard spider (S. grossa) One of three most common species in UK and body 4.5 mm to 10 mm long.
  • Noble False Widow (S. nobilis) Most common species and largest of the three common species. Body length between 8.5 to 11 mm.

False Widow

Steatoda genus contain 120 recognized species Six of these species live permanently in UK. False Widow Spider have three most common species in UK. False widows sometimes confused for black widow spiders. Both have similar dark coloured, globular body.

Kingdom Animalia
Phylum Arthropoda
Subphylum Chelicerata
Class Arachnida
Order Araneae
Family Theridiidae
Genus Steatoda
False Widow
False Widow

In Britain more than 640 species and only dozen of these bite humans. These spiders are poisonous and have mild or little effect on humans. Steatoda species fairly common in UK and these spiders have same family i.e Theridiidae) as black widows but different genus.

Steatoda bipunctata – Common spider of outbuildings and shed. Body rarely exceeds 7 mm in length for mature females and 5 mm for males. Dark & shiny sometimes with pattern or whitish line. They also have dots on abdomen from which gets taxonomic name, not easily visible with naked eye.

False Widow Spider 

Steatoda grossa – 10 mm body length for mature females and males are smaller. Juveniles and adult males having pattern and adult females often having none.

Steatoda nobilis – Often called Noble S. nobilis & other species maximum body length of 14 mm for females and 10mm for males.

False Widow Spider Facts

There plenty of other spiders and also cause confusion in homes and gardens across the UK. Also Web usually suspended at least 1.5 meter above ground and allow spiders to hunt flying insects. The webs tangle of threads, a characteristic of all false widow species.

Male spiders more prone to biting because they leave web in search of mate, venturing indoors looking for females.

They only known to bite when trapped or provoked.

False Black Widow Spider

These spiders have distinctive cream marking on bulbous body & is brown with red to orange legs. Prey – It can eat insects, other spiders and invertebrates.

Place to live – False widows spider prefers warm and dark places.

These spiders have most frequently in Autumn and also at this time larger species reach max size and oftenly visible.

About – 20 species (19 species and 1 sub species)

Size – Female – 2.5 mm to 11 mm and males 2.0 to 7.5mm

Identification – coloration – purple brown and often white line around anterior.

These spiders are no more venomous than wasp or bee.

Widow Spider false UK images, read about UK false widow spider available. Also read about Steatoda nobilis United Kingdom. Two main body parts – cephalothorax and abdomen. Spiders body and legs have glossy appearance. Closely remember yo black widow spider.

False Widow Bite

Bites from false widows generally rare and symptoms are quite mild

  • Nausea
  • Redness & Swelling around bite area
  • Vomiting
  • Sweating
  • Dizziness
  • In rare cases – bite can get infected and cause allergic reaction.

Steatoda spiders are most venomous species in UK but less than black widow spiders. What should I do if I am bitten?

Wash bite area with clean water and soap. Also apply cool compress of ice pack.  Antibiotics not helpful until wound become infected.

Also Do not apply, cut suction to the wound.

Monitor breathing, sweating, pain and infection signs. Also monitor bite area – swelling, redness, pain or sign of infection.

Also Know about – Black Widow Eggs

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