Two new quill mite species of the genus Psittaciphilus Fain, Bochkov & Mironov, 2000 (Acariformes: Syringophilidae) associated with pigeons and doves (Columbiformes: Columbidae)

Two new quill mite species of the genus Psittaciphilus Fain, Bochkov & Mironov, 2000 (Acariformes: Prostigmata: Syringophilidae) collected from columbiform birds (Columbiformes) are described: Psittaciphilus montanus n. sp. form the ruddy quail-dove Geotrygon montana Gosse from Trinidad and Tobago, Brazil and Panama, and Psittaciphilus patagioenas n. sp. from the band-tailed pigeon Patagioenas fasciata (Say) from Colombia and the scaled pigeon Patagioenas speciosa (Gmelin) from Surinam. A key to the species of the genus Psittaciphilus is provided. Our finding is the first record of the representatives of this genus on columbiform birds.


Introduction
The quill mites of the family Syringophilidae Lavoipierre, 1953 (Acariformes: Prostigmata) are permanent and highly specialised ectoparasites, infesting quills of different types of feathers in the plumage of their avian hosts (Kethley, 1970). These mites show a high degree of host specificity, where most of species are mono-or stenoxenous parasites (Skoracki, 2011;Skoracki et al., 2016). Currently, the family includes 377 described species grouped in 62 genera and two subfamilies and recorded from about 500 host species belonging to 95 families and 24 orders (Zmudzinski & Skoracki, 2017).
The Psittaciphilus Fain, Bochkov & Mironov, 2000 is one of less known genera in the family Syringophilidae. Until now, only two species have been described, P. amazonae Fain, Bochkov &Mironov, 2000 andP. fritschi Fain, Bochkov &Mironov, 2000, both associated with parrots (Fain et al., 2000). Mites of this genus predominantly live inside the quills of the wing coverts, under-tail coverts and contour feathers (pers. obs.) and together with five other genera belong to the Psittaciphilus-generic-group established by Bochkov & Perez (2002).
In this paper we describe two new species of the genus Psittaciphilus associated with the South American pigeons and doves: P. montanus n. sp. from Geotrygon montana (Linnaeus) and P. patagioenas n. sp. from Patagioenas fasciata (Say) and Patagioenas speciosa (Gmelin).

Materials and methods
The mite material used in the present study was collected from dry bird skins housed in the ornithological collection of the Bavarian State Collection of Zoology, Munich, Germany (ZSM). Feathers were examined using a dissecting microscope and opened with a fine scalpel. Before mounting, mites were softened and cleared in Nesbitt's solution at room temperature for three days. Then, mites were mounted on slides in Hoyer's medium. Taxonomic analysis of mite specimens was carried out with an Olympus BH-2 light microscope (Olympus Corp., Japan), equipped with DIC optics and a camera lucida. All measurements are given in micrometres. Measurements (ranges) of paratypes are given in parentheses following data for the holotype. In the descriptions below, the idiosomal chaetotaxy follows Grandjean (1939) as adapted for Prostigmata by Kethley (1990). The nomenclature of leg setae follows that proposed by Grandjean (1944). Morphological terminology follows Skoracki (2011). The scientific names of the birds follow Clements et al. (2017).
Specimen depositories are cited using the following abbreviations: AMU, A. Mickiewicz University, Department of Animal Morphology, Poznan, Poland; ZSM, Bavarian State Collection of Zoology, Munich, Germany.

Differential diagnosis
Psittaciphilus montanus n. sp. is morphologically similar to P. fritschi, collected from unidentified parrot from Zoo of Anverp (Belgium) (Fain et al., 2000). In females of both species, the stylophore, the infracapitulum and the pygidial shield are apunctate, and the medial branch of the peritremes has two chambers. This new species differs from P. fritschi by the following features: in females of P. montanus n. sp., each lateral branch of the peritremes has four or five chambers, the propodonotal shield is punctate and with three oval patches, and a pair of hysteronotal sclerites surrounding bases of setae d2 is present. In females of P. fritschi, each lateral branch of the peritremes has six chambers, the propodonotal shield is apunctate and without oval shape patches, the hysteronotal shields surrounding bases of setae d2 are absent.

Differential diagnosis
Psittaciphilus patagioenas n. sp. is morphological similar to P. amazonae, collected from Amazona amazonica (Linnaeus) (Psittaciformes: Psittacidae) from Colombia (Fain et al., 2000). In females of both species, the stylophore and the infracapitulum are apunctate, the lengths of setae ve and si are 110-120 and 30-47 lm, respectively, and coxal fields I-IV are apunctate. This new species differs from P. amazonae by the following features: in females of P. patagioenas n. sp., the propodonotal and the pygidial shields are apunctate, the hysteronotal shields surrounding bases of setae d2 are present, the lengths of hysteronotal