Tigrosa Grandis

tigrosa grandis

Tigrosa grandis, commonly known as the giant tiger wolf spider, is a formidable yet fascinating arachnid native to the grasslands and floodplains of North America. Renowned for its impressive size and robust build, this wolf spider is an active nocturnal hunter that eschews traditional webs in favor of actively stalking and chasing down its prey. Its common and scientific names hint at its fierce, tiger-like striped patterns and large physical stature within the Lycosidae family. Despite their intimidating appearance, these spiders are vital contributors to their ecosystems, acting as natural pest controllers. They play a critical role in managing insect populations, especially in agricultural and suburban areas. Female Tigrosa grandis demonstrate remarkable maternal instincts, carrying their spherical egg sacs wherever they go and later carting dozens of tiny spiderlings on their backs, offering an extraordinary glimpse into arachnid parental care.

Habitat: Typically found in temperate grasslands, open woodlands, agricultural fields, and riparian zones, often hiding under flat stones, logs, or leaf litter during the day.

Appearance

Tigrosa grandis is characterized by its large, robust, and hairy body, typically measuring 1.5 to 3.5 centimeters in length, with females being significantly larger than males. Its coloration is a mixture of cryptic grays, deep browns, and tan, dominated by a prominent light-colored median stripe running down the dark cephalothorax. The legs are thick and powerful, often displaying faint, darker banding. One of its most identifying features is its arrangement of eight eyes, including two exceptionally large, forward-facing posterior median eyes that gleam when caught by a flashlight beam at night.

KingdomAnimaliaPhylumArthropodaClassArachnidaOrderAraneaeFamilyLycosidaeGenusTigrosa

Tigrosa Grandis

Interesting facts

If you shine a flashlight over a grassy field at night, you can spot these spiders by their green eyeshine, caused by light reflecting off a membrane behind their retinas.

Unlike many spiders that spin webs to catch food, Tigrosa grandis is a cursorial hunter, meaning it relies on its impressive speed and physical strength to overpower prey.

When the spiderlings hatch, they climb onto their mother's back, clinging to specialized knobbed hairs until they are large enough to disperse and fend for themselves.

Special abilities

Equipped with specialized sensory hairs called trichobothria, this spider can detect minuscule vibrations in the ground or air, allowing it to pinpoint prey and sense approaching predators without relying on sight.

Possesses large, highly sensitive eyes backed by a reflective membrane called a tapetum lucidum, giving it superb night vision crucial for nocturnal hunting.

Females carry their egg sacs attached to their spinnerets and later transport hatched spiderlings on their abdomens, aggressively defending them from threats.

Measurements & details

Length: 2-4 cm
Weight: 0.001-0.006 kg
Lifespan: 1-3 years
Top Speed: 2 km/h
Clutch Size: 100-300
Incubation: 14-28 days

Diet & Feeding

An active predator that hunts a variety of terrestrial invertebrates and small insects on the ground.

Age differences: Spiderlings feed on tiny insects like fruit flies and springtails, while mature adults tackle much larger prey including large beetles and grasshoppers.

Primary Foods

Field Cricket
Differential Grasshopper
Ground Beetle
Sowbug

Foraging Method

Pursuit

Ecological connections

hunts

Differential Grasshopper

Melanoplus differentialis

Preys upon this common agricultural pest during night hunts.

eaten by

Yellow-horned Spider Wasp

Entypus unifasciatus

Often parasitized and paralyzed by this wasp to serve as food for its larvae.

competitor

Carolina Wolf Spider

Hogna carolinensis

Competes for ground-dwelling insect prey in the same grassland habitats.

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Tigrosa Grandis?

The easiest way to identify Tigrosa Grandis is to use the Snappit nature identifier app.

How long is Tigrosa Grandis?

2-4 cm

How much does Tigrosa Grandis weigh?

0.001-0.006 kg

How long does Tigrosa Grandis live?

1-3 years

How fast can Tigrosa Grandis move?

2 km/h

What does Tigrosa Grandis eat?

An active predator that hunts a variety of terrestrial invertebrates and small insects on the ground.

Where is Tigrosa Grandis usually found?

Typically found in temperate grasslands, open woodlands, agricultural fields, and riparian zones, often hiding under flat stones, logs, or leaf litter during the day.

How does Tigrosa Grandis hunt?

Pursuit