Ornithodoros turicata

Soft ticks of the family Argasidae lack the hard scutum present in ixodid (hard) ticks. Ornithodoros turicata can be distinguished from hard ticks by its leathery, wrinkled integument and the absence of visible mouthparts from above. As an argasid tick, it feeds rapidly (minutes to hours) rather than remaining attached for days. Specific morphological characters distinguishing O. turicata from congeners require microscopic examination of capitular and spiracular structures.

Occupies cavity environments including burrows, dens, caves, and sheltered rocky crevices. Associated with host nesting sites and resting places rather than vegetation. Success in cavity microhabitats reflects adaptation to sheltered, humid refugia where hosts regularly return.

Midwestern and southwestern United States; records from Texas, California, and other states within this range. GBIF records indicate presence in Middle America and North America.

Obligate blood-feeder on vertebrate hosts. Bloodmeal metabarcoding has identified 27 host species: 17 mammals, 5 birds, 1 reptile, and 4 amphibians. Documented hosts include desert tortoise (Gopherus agassizi), wild pig (Sus scrofa), chicken, goat, and domestic swine. Multiple host species may be detected within individual ticks, indicating successive feedings on different hosts.

• Gopherus agassizi - hostdesert tortoise in California
• Sus scrofa - hostwild pig; first documented off-host detection
• Gallus gallus - hostchicken
• Capra aegagrus hircus - hostgoat
• Sus scrofa domesticus - hostdomestic swine

Egg → larva → nymph (multiple instars, typically 3–5) → adult. Complete development from egg to egg-laying female has been accomplished in laboratory conditions. Females exhibit autogenous reproduction, producing eggs without an additional bloodmeal. Transovarial transmission of Borrelia turicatae to progeny has been demonstrated.

Rapid feeding behavior typical of argasid ticks: bloodmeals are completed in minutes to hours rather than the extended attachment of hard ticks. Multiple nymphal instars occur between larval and adult stages. Can survive extended periods between bloodmeals. Autogenous reproduction allows egg production without vertebrate host contact.

Vector of Borrelia turicatae, maintaining and transmitting relapsing fever spirochetes among vertebrate populations. Transovarial transmission enables the tick to serve as a natural reservoir, perpetuating infection independently of host availability. Bloodmeal analysis indicates involvement in connecting pathogen circulation across diverse wildlife, domestic animal, and human interfaces.

Primary vector of tick-borne relapsing fever caused by Borrelia turicatae in humans. Laboratory demonstration of vector competence for Leptospira pomona, agent of canine jaundice. Potential concern for African swine fever virus transmission should it be introduced to the United States, given documented feeding on wild pigs.

• Ornithodoros hermsiAlso a North American vector of relapsing fever spirochetes; distinguished by geographic distribution and specific morphological characters of the capitulum and spiracular plates
• Ornithodoros parkeriOverlapping distribution and similar habitat use in burrows and caves; requires microscopic examination for definitive identification
• Ixodid ticks (hard ticks)Readily distinguished by presence of hard scutum, extended feeding duration (days), and visible mouthparts from dorsal view; O. turicata lacks scutum and feeds rapidly

• soft tick
• argasid
• vector
• relapsing fever
• Borrelia turicatae
• zoonosis
• autogeny
• transovarial transmission
• cavity-dwelling
• blood-feeding
• Texas
• California
• midwestern US
• southwestern US
• wildlife disease
• African swine fever risk

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Ecology ofOrnithodoros turicata: Success in the cavity environment
• Life Cycle of Ornithodoros Turicata Americanus (Acari: Argasidae) in the Laboratory1
• The Desert Tortoise, Gopherus agassizi, a Host for the Tick Ornithodoros turicata in California
• Vertical transmission of Borrelia turicatae (Spirochaetales: Borreliaceae ) by autogenously reproducing Ornithodoros turicata (Ixodida: Argasidae) female naturally infected with the spirochetes
• Identification of Host Bloodmeal Source in Ornithodoros turicata Dugès (Ixodida: Argasidae) Using DNA-Based and Stable Isotope-Based Techniques
• Bloodmeal metabarcoding of the argasid tick ( Ornithodoros turicata Dugès) reveals extensive vector-host associations
• Range Modeling and Surveillance of Ornithodoros turicata Ticks: Implications for Detecting African Swine Fever Virus in the United States.