Tigrosa helluo

(Walckenaer, 1837)

Wetland Giant Wolf Spider

Tigrosa helluo is a medium-sized wolf spider (Lycosidae) native to North America, formerly classified as Hogna helluo. average approximately 17 mm in body length, with females larger than males. The is distinguished by a brown with a prominent yellow stripe extending from the down the , and black spots on the underside of the . It inhabits diverse environments including woods, marshes, fields, and riparian areas, with a preference for wetter . The spider is , solitary, and an active hunter that does not build webs for prey capture.

Tigrosa helluo by (c) Judy Gallagher, some rights reserved (CC BY). Used under a CC-BY license.Hogna helluo on wood by Patrick Edwin Moran. Used under a CC BY-SA 3.0 license.Common Spiders U.S. 166-7 by James Henry Emerton (1847 – 1931). Used under a Public domain license.

Pronunciation

How to pronounce Tigrosa helluo: /tɪˈɡroʊsə ˈhɛluoʊ/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from Tigrosa georgicola by fainter yellow stripes that do not extend as far posteriorly and by presence of black spots on (absent in T. georgicola). Smaller than close relative T. aspersa. Distinguished from nursery web spider Pisaurina mira by body structure and arrangement. Distinguished from Pardosa milvina by larger size and different hunting (T. helluo waits for prey, P. milvina actively seeks prey).

Images

Appearance

brown with distinctive yellow stripe extending from down ; fainter yellow stripes extend posteriorly from eyes. Underside of marked with several distinct black spots. Average body length approximately 17 mm. Females larger than males: females typically exceed 300 mg with carapace widths around 6.5 mm; males usually exceed 200 mg with carapace widths around 4.5 mm. Male legs yellow without distinct markings; female legs reddish brown without additional markings or bands.

Habitat

Woods, marshes, fields, riparian areas, and grassy areas. Shows preference for wetter environments over dry . In northeastern states, found in woods, marshes, and grassy areas; in Florida and Mississippi, primarily in wet areas such as marshes and lakes. Females construct burrows under stones or boards in fields and woods. Successful in disturbed agroecosystems.

Distribution

United States, Canada, and Mexico. Primarily eastern half of United States, from New England and Northeast down entire East Coast to Florida, west to Nebraska and Kansas.

Seasonality

Active year-round with temperature-dependent . Mating occurs May-June. Males mature May-September; female maturation can occur any time of year. Males typically die before winter; females overwinter.

Diet

Crickets, fly , , , beetles, and other insects. Prey includes smaller spiders such as Pardosa milvina. Polytypic diet associated with higher and earlier sexual maturity compared to diet.

Life Cycle

Males live approximately one year; females live approximately two years. sacs constructed May-July, 8-12 mm diameter. Eggs tan or yellow, 1-2 mm diameter. Females carry egg sac on back until hatching; hatchlings carried on female's back until able to hunt independently. Molting periodic, frequency dependent on nutritional intake.

Behavior

and solitary. Hunts actively without webs; females build silk-lined burrows under rocks or boards and wait for prey, males roam while hunting. Uses excellent eyesight and vibration sensitivity for hunting and detection. Displays spatial learning and memory, using visual associative and beacon landmarks for navigation. Shows preference for chemical cues matching recently hunted prey. Well-fed individuals construct more burrows than starved individuals. Switches between multiple foraging sites.

Ecological Role

of insects and smaller spiders. Prey for praying mantises, birds, (including spider wasps such as Anoplius aethiops), small reptiles, and other spiders.

Human Relevance

Bites occur only when provoked; venom not medically significant to humans, causing only minor pain and swelling. Antivenom rarely needed. Occasionally enters human dwellings; can be relocated outdoors.

Similar Taxa

  • Tigrosa georgicolaSimilar patterns but T. helluo has fainter yellow stripes that do not extend as far and has black spots on underside absent in T. georgicola
  • Tigrosa aspersaClose relative but T. helluo is significantly smaller
  • Pisaurina miraPhysical resemblance but differs in structure, arrangement, and
  • Pardosa milvinaBoth common wolf spiders but P. milvina is smaller and actively seeks prey while T. helluo waits for prey; P. milvina is also prey for T. helluo

Tags

Sources and further reading