Psittophagus hollandicus n . sp . , a new feather mite species ( Acariformes : Pterolichidae ) from the cockatiel Nymphicus hollandicus ( Kerr , 1792 ) ( Psittaciformes : Cacatuidae ) in Brazil

A new feather mite species, Psittophagus hollandicus n. sp. (Acariformes: Pterolichidae), is described from the cockatiel Nymphicus hollandicus (Kerr, 1792) (Psittaciformes: Cacatuidae) kept in captivity in Brazil.


INTRODUCTION
The cockatiel Nymphicus hollandicus (Kerr, 1792) (Psittaciformes: Cacatuidae) is native to Australia but owing to maintaining as a household pet it distributed worldwide (Engebretson, 2006). The only other feather mite species previously described from this host is Nymphicilichus perezae Mironov & Galloway, 2002 (Astigmata: Pterolichidae) in New Zealand.

MATERIALS AND METHODS
The material was collected from a specimen of Nymphicus hollandicus which died in captivity and sent to the laboratory of Acari of the Department of Zoology, Universidade Estadual Paulista, Rio Claro, São Paulo, Brazil. The bird specimen was placed in a freezer and then washed with water containing detergent; the liquid was then filtered and mites were collected with a fine brush from the filter papers under stereomicroscope, cleared in 30% lactic acid for 24 h at 50°C, and mounted in Hoyer's medium (Krantz and Walter, 2009). After five days at 50°C, the slides were sealed with varnish. Drawings and measuring of mites were made with a Leica DM3000 microscope equipped with differential interference contrast (DIC) optics and a camera lucida. Pencil sketches were scanned at 300 dpi and grayscale mode; line drawings were created with Adobe Illustrator CS6 and a Wacom Bamboo Create tablet. The idiosomal and leg chaetotaxies follow Griffiths et al. (1990) and Atyeo and Gaud (1966), respectively, with corrections for coxal setae proposed by Norton (1998 Differential diagnosis -The new species is morphologically close to P. lacunosus Dabert, Badek & Skoracki, 2007 in having, in males, setae e2 thick spiculiform, and the hysterosomal shield reaching to or close to the level of setae c1. Psittophagus hollandicus n. sp. is distinguished from that species in having, in males, the dorsal shields with weak ornamentation, the prodorsal shield split transversally at the level of scapular setae and free from the scapular shields, solenidion σ of genu III about half as long as the segment (Fig. 3C), setae si, c2 filiform, and the anal suckers without indentations. Females of the new species have piliform setae d2 and e2, setae d2 being 30µm long and barely reaching the halfway to bases of piliform setae e2. In contrast, males of P. lacunosus have the dorsal shields covered with numerous rounded lacunae, the prodorsal shield entire and fused with the scapular shields, solenidion σ of genu III equal to or even longer than the segment, setae si, c2 spiculiform, and the suckers with indentations; females of P. lacunosus have setae d2 and e2 long spiculiform, the former setae are much longer ( 100µm) and distinctly surpass the bases of corresponding setae e2.
Female (Figures 2, 3F-G) (range for 4 paratypes)  Etymology -The species name is taken from the specific epithet of the type host.
Remarks -1) In addition to Nymphicilicus perezae from the cockatiel in Brazil, Albuquerque et al. (2012) reported an undetermined Psittophagus species quite probably corresponding to the new species described herein. However, the SEM photo of the female applied to that undetermined species (Albuquerque et al., 2012: page 577, figure 7B) seemingly depicts the female of N. perezae, rather than that of Psittophagus species. This is suggested based on the length of setae si and the ornamentation of the hysteronotal shield.
2) The illustrations of P. galahi and N. perezae females in Mironov et al. (2003) were accidentally mixed up.
The correct legend for figure 9 in that paper should actually be: Fig. 9, a -N. perezae, b -P. galahi.