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Mediterranean Black Widow (Latrodectus tredecimguttatus)

The Mediterranean black widow spider has a history that dates back to 1790 when Italian expert Pietro Rossi introduced us to it. These spiders belong to the comb-footed family. Interestingly, they were once thought to be a close relative of the southern black widow. Get ready to discover more fascinating details about them here!

Scientific Classification

  • Family: Cobweb Spiders
  • Genus: Latrodectus
  • Scientific name: Latrodectus tredecimguttatus

Mediterranean Black Widow Spider

Physical Description and Identification

Adults

  • Size: Male: 0.4-0.7 cm Female: 0.7-1.5 cm
  • Color: They are black, with thirteen spots on their dorsal abdomen. These spots are red but sometimes yellow or orange in some individuals.
  • Other Characteristic Features: Their abdomen is covered in long and short hairs.

Latrodectus Tredecimguttatus

Eggs

They lay their eggs in a giant white sac, producing 6-8 sacs in their lifetime.

Mediterranean Black Widow Egg Sac

Spiderlings

Hundreds of spiderlings emerge from the sac laid by their mother.

The Web

Their webs consist of three layers, with the middle layer shaped like a series of hexagonal meshes.

Latrodectus Tredecimguttatus Web

Are Mediterranean Black Widow Spiders Venomous?

Yes, Mediterranean Black Widow spiders are venomous and can pose a threat to humans with their bite. Only the females are considered deadly, as the males lack strong mouthparts to pierce human skin.

Can Mediterranean Black Widow Spiders Bite?

Absolutely! Mediterranean Black Widow spiders can and do bite, especially when they feel threatened or disturbed. Their bite is painful but only fatal in rare cases.

European Black Widow

Ecological Importance and Behavior of Mediterranean Black Widow

The Mediterranean black widow spider is an important predator in its ecosystem, mainly consuming insects like ants and beetles. This diet helps control the population of these insects, contributing to ecological balance.

Natural Predator: Birds, wasps, and some small mammals are known to prey upon the Mediterranean black widow, which helps manage their numbers in the wild.

Prey-Predator Dynamics: This species is a pivotal part of the food chain, acting as both a predator to numerous insects and as prey to various larger species, ensuring the maintenance of natural cycles within their grassland habitats.

Relationship with Humans: While encounters with humans are relatively rare, there is an overlap between human agriculture and the spider’s natural territory, which can lead to bites. However, incidents of fatal bites are extremely rare and usually only occur under specific circumstances.

Mediterranean Black Widow Female

Quick Facts

Other namesEuropean black widow, karakurt (“black worm”)
Lifespan1-3 years
DistributionCaucasus, Central Asia, China, Iran, Kazakhstan, Mediterranean, Russia (Europe to South Siberia), and Ukraine
HabitatSteppes and other grasslands
Common PredatorsBirds, wasps, some small mammals
DietInsects like ants and beetles

Mediterranean Black Widow

Did You Know

  • While generally not coming in contact with humans, there have been reports of farm workers being bitten, as their farmlands often overlap with the spider’s natural habitat.
  • In Kazakhstan, there have been reports of the bite of the Mediterranean black widow killing camels.

In conclusion, the Mediterranean black widow spider, with its venomous bite and distinctive appearance, plays a crucial role in the ecological systems of grasslands and steppes.

The Mediterranean black widow spider has a history that dates back to 1790 when Italian expert Pietro Rossi introduced us to it. These spiders belong to the comb-footed family. Interestingly, they were once thought to be a close relative of the southern black widow. Get ready to discover more fascinating details about them here!

Mediterranean Black Widow Spider

Physical Description and Identification

Adults

  • Size: Male: 0.4-0.7 cm Female: 0.7-1.5 cm
  • Color: They are black, with thirteen spots on their dorsal abdomen. These spots are red but sometimes yellow or orange in some individuals.
  • Other Characteristic Features: Their abdomen is covered in long and short hairs.

Latrodectus Tredecimguttatus

Eggs

They lay their eggs in a giant white sac, producing 6-8 sacs in their lifetime.

Mediterranean Black Widow Egg Sac

Spiderlings

Hundreds of spiderlings emerge from the sac laid by their mother.

The Web

Their webs consist of three layers, with the middle layer shaped like a series of hexagonal meshes.

Latrodectus Tredecimguttatus Web

Are Mediterranean Black Widow Spiders Venomous?

Yes, Mediterranean Black Widow spiders are venomous and can pose a threat to humans with their bite. Only the females are considered deadly, as the males lack strong mouthparts to pierce human skin.

Can Mediterranean Black Widow Spiders Bite?

Absolutely! Mediterranean Black Widow spiders can and do bite, especially when they feel threatened or disturbed. Their bite is painful but only fatal in rare cases.

European Black Widow

Ecological Importance and Behavior of Mediterranean Black Widow

The Mediterranean black widow spider is an important predator in its ecosystem, mainly consuming insects like ants and beetles. This diet helps control the population of these insects, contributing to ecological balance.

Natural Predator: Birds, wasps, and some small mammals are known to prey upon the Mediterranean black widow, which helps manage their numbers in the wild.

Prey-Predator Dynamics: This species is a pivotal part of the food chain, acting as both a predator to numerous insects and as prey to various larger species, ensuring the maintenance of natural cycles within their grassland habitats.

Relationship with Humans: While encounters with humans are relatively rare, there is an overlap between human agriculture and the spider’s natural territory, which can lead to bites. However, incidents of fatal bites are extremely rare and usually only occur under specific circumstances.

Mediterranean Black Widow Female

Quick Facts

Other namesEuropean black widow, karakurt (“black worm”)
Lifespan1-3 years
DistributionCaucasus, Central Asia, China, Iran, Kazakhstan, Mediterranean, Russia (Europe to South Siberia), and Ukraine
HabitatSteppes and other grasslands
Common PredatorsBirds, wasps, some small mammals
DietInsects like ants and beetles

Mediterranean Black Widow

Did You Know

  • While generally not coming in contact with humans, there have been reports of farm workers being bitten, as their farmlands often overlap with the spider’s natural habitat.
  • In Kazakhstan, there have been reports of the bite of the Mediterranean black widow killing camels.

In conclusion, the Mediterranean black widow spider, with its venomous bite and distinctive appearance, plays a crucial role in the ecological systems of grasslands and steppes.