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    Ultrastructural investigations of Haller’s organ in Dermacentor reticulatus (Fabr.) (Acari: Ixodida: Ixodidae)
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    The effects of temperature on oviposition by Dermacentor andersoni (Stiles) was examined using replete females ranging in weight from 30 to 1,198 mg. Survivorship was >96% during the preoviposition periods and declined during oviposition period. Egg production peaked earlier and at greater levels as temperature increased. Longevity, preoviposition period, and oviposition period declined as temperature increased. Replete weight had minor effects on measures of time, but smaller females tended to have greater longevity and preoviposition periods, and shorter oviposition periods. Temperature and replete weight both had large effects on measures of oviposition success such as the amount of eggs laid, the conversion efficiency index, and daily egg production. Lower temperatures and replete weight resulted in greater oviposition failure, and reduced egg production and conversion efficiency. Oviposition was greatly inhibited at 10 degrees C, suggesting this is near the lower temperature limit for development. However, egg production was reduced at temperatures < 20 degrees C, suggesting that the northern edge of the distribution may be influenced by the effects of temperature on oviposition.
    Parasitiformes
    Dermacentor
    Citations (9)
    Two species of the ixodid tick genus Dermacentor Koch, 1844 (Acari: Ixodidae) have previously been documented from Laos: D. auratus Supino, 1897 and D. steini (Schulze, 1933). Between 2012 and 2017, we recorded four additional Dermacentor species from this country: D. bellulus (Schulze, 1935); D. compactus Neumann, 1901; D. filippovae Apanaskevich & Apanaskevich, 2015; and D. tamokensisApanaskevich & Apanaskevich, 2016. In addition, seven specimens in the tick collection at the Institut Pasteur du Laos may represent new species and are currently under taxonomic investigation.
    Dermacentor
    Dermacentor reticulatus
    Parasitiformes
    Citations (13)