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Stone Spider (Drassodes lapidosus) Venom: Effects on Humans

Overview

The stone spider (Drassodes lapidosus) is a ground‑dwelling species in the family Gnaphosidae. Its venom is adapted for subduing small invertebrate prey and is not medically significant to humans.

Typical Bite Reaction

  • Pain: Mild, similar to a bee sting.
  • Local effects: Minor redness, itching, slight swelling at the bite site.
  • Duration: Symptoms usually resolve spontaneously within a few days.
  • Treatment: Clean with soap and water; apply cool compress; over‑the‑counter antihistamine or analgesic if needed.

Rare Allergic Reactions

In sensitized individuals, a bite may trigger:

  • Widespread hives or swelling (angioedema)
  • Difficulty breathing or swallowing
  • Nausea, vomiting, dizziness
  • Action: Seek emergency care immediately – treat as anaphylaxis.

Behavior & Risk Reduction

  • Non‑aggressive; bites only when trapped or pressed against skin.
  • Common in leaf litter, under stones, in basements/garages.
  • Prevention: Wear gloves when gardening or moving stored items; shake out shoes/clothing left on floor.

When to Consult a Clinician

  • Signs of infection (increasing redness, warmth, pus, fever).
  • Symptoms worsening after 24‑48 hours.
  • Any systemic reaction (see allergic reactions above).

Bottom line: Stone spider bites are harmless for the vast majority. Simple wound care suffices; severe reactions are exceedingly rare and allergy‑related.

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