Fig 114 (a). Ptilonyssus acrocephali female dorsal habitus.

Fig 114 (b). Ptilonyssus acrocephali female dorsum.

Fig 114 (c). Ptilonyssus acrocephali female venter.

North American host records:
Regulidae:
Regulus calendula, Ruby-crowned Kinglet (Pence 1972, 1975; Spicer 1987; Knee et al. 2008)

Diagnostic characteristics:
– two dorsal shields, podosomal and pygidial shields
– posterior margin of podosomal shield medially straight with lateral lobes, shield highly reduced
– st1 on sternal shield, st2 and st3 off shield
– subapical ventral setal pair on tarsus IV are relatively long strong spikes
– six pairs of ventral opisthosomal setae
– five pairs of mesolateral setae
– at least two pairs of mesolateral setae twice as long as other mesolateral setae
– subposterior pair of dorsal podosomal setae are as long or almost as long as the longest mesolateral setae
– paranal setae level with anal opening, paranal and postanal setae are equal or almost equal in length

References:
Fain, A. 1964. Les acariens parasites nasicoles des oiseaux de Belgique. IV. Notes sur quelques
        Rhinonyssidae avec description de deux especes nouvelles. Bulletin and Annales de la Societe
        Royale d’Entomologie de Belgique, 100: 55-61.
Knee, W., Proctor, H., and Galloway, T. 2008. Survey of nasal mites (Rhinonyssidae, Ereynetidae,
        and Turbinoptidae) associated with birds in Alberta and Manitoba, Canada. Canadian Entomologist,
        140
: 364-379.
Pence, D.B. 1972. The nasal mites of birds from Louisiana IV. The genus Ptilonyssus (Dermanyssidae:
        Rhinonyssinae) with a description of two new species. Journal of Parasitology, 58: 1162-1169.
Pence, D.B. 1975. Keys, species and host list, and bibliography for nasal mites of
        North American birds (Acarina: Rhinonyssinae, Turbinoptinae,
        Speleognathinae, and Cytoditidae). Special Publications of the Museum Texas
        Tech University, 8: 1-148.
Spicer, G.S. 1987. Prevalence and host-parasite list of some nasal mites from birds (Acarina:
        Rhinonyssidae, Speleognathidae). Journal of Parasitology, 73: 259-264.

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