Species profile

Australian paralysis tick

Ixodes holocyclus

An eastern Australian tick capable of causing paralysis. Current Australian clinical guidance should be followed after suspected exposure.

Ixodes holocyclus Australian paralysis tick specimen photographed against lined paper
Specimen from a dog

Image credit:Matilda / Wikimedia Commons Licence terms — Avautuu uuteen ikkunaan.Source — Avautuu uuteen ikkunaan.

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Quick facts

Family: Ixodidae. Genus: Ixodes. Hard tick.

Identification

A hard tick in the genus Ixodes. Species confirmation requires examination of diagnostic morphology; photographs, host and location alone may be insufficient.

Similar species can overlap in appearance. Confirm using authoritative keys and expert examination when identification affects health, veterinary care or surveillance.

Photographs alone cannot always confirm this species. Geographic location and host are supporting context, not conclusive identification.

Sex and appearance differences

Adult females have a smaller scutum that permits expansion during feeding; adult males generally have a scutum covering most of the dorsum. Species-specific differences require expert review.

Life cycle

Hard-tick life cycle with egg, larva, nymph and adult stages. Host use and number of hosts vary by species.

Life stages

  • Egg
  • Larva
  • Nymph
  • Adult

Seasonal activity

Seasonal activity is not generalised without accepted location-specific evidence.

Hosts

  • Humans (Homo sapiens)
  • Dogs (Canis lupus familiaris)

Habitats

  • Woodland edges and trails

Distribution

Detailed distribution is shown only when supported by governed country or region occurrence records.

Presence, established populations, habitat suitability and disease risk are distinct evidence categories.

Countries and regions

  • Oceania — present

    Australian Government health guidance identifies Ixodes holocyclus as the Australian paralysis tick and documents its distribution.

Medical and veterinary relevance

An eastern Australian tick capable of causing paralysis. Current Australian clinical guidance should be followed after suspected exposure.

Recorded host relevance includes humans, dogs; significance varies by place and evidence.

Vector and pathogen evidence

Vector status is stated only where the cited source distinguishes confirmed transmission from detection, laboratory competence or possible association.

Medical importance

Veterinary importance

Host and veterinary relevance are limited to the cited evidence and require local interpretation.

Prevention and removal guidance

Use current public-health and veterinary guidance, avoid known tick habitats where practical, use suitable repellents or protective clothing, and check people and animals after exposure.

Remove attached ticks promptly using fine-tipped tweezers or an appropriate tick-removal tool. Seek medical or veterinary advice when symptoms or concerns arise.

Important identification and health information

Educational information and limitations

Photographs and visible features may be insufficient for definitive identification.

This educational information is not a diagnosis or a substitute for medical or veterinary advice.

This educational information does not replace examination or advice from a qualified veterinary professional.

Presence, established populations, habitat suitability and disease risk are distinct evidence categories.