New and little known species of oribatid mites of the family Haplozetidae (Acari, Oribatida) from Ecuador

Abstract We described two new species, Haplozetes paraminimicoma sp. n. and Protoribates ecuadoriensis sp. n. from Ecuador. Additionally, a detailed supplementary description of Trachyoribates (Rostrozetes) glaber (Beck, 1965) is given on the basis of Ecuadorian specimens, which was known previously only from Peru. An annotated checklist of all identified taxa of Haplozetidae from Ecuador is presented.


Introduction
The present study is based on the oribatid mite materials collected from the tropical rain forest soils in Ecuador, between 2008 and 2010. This paper is part of our continuing studies (see Ermilov et al. 2013a-c), and it includes the data on the family Haplozetidae. An annotated checklist of identified taxa is presented below.
In the course of taxonomic identification of the haplozetid mites, we found two new species belonging to the genera Haplozetes Willman, 1935 andProtoribates Berlese, 1908. The genus Haplozetes was proposed by Willmann (1935) with Peloribates vindobonensis Willmann, 1935 as the type species. Subsequently, Grandjean (1936) redefined the type species, and ascertained generic status of Haplozetes and proposed the family Haplozetidae. This status has been accepted later by many authors (e.g. Balogh 1963Balogh , 1965Balogh , 1972Shaldybina 1975;Balogh 1984, 1992;Pérez-Iñigo 1993;Bayartogtokh 2000;Weigmann 2006;Murvanidze and Weigmann 2012). Recently, Subías (2004) treated Haplozetes as a subgenus of Indoribates Jacot, 1929, without justifying this action. We do not agree with the latter author's concept, and, therefore, consider here Haplozetes as an independent genus. This is one of the smallest genera of oribatid mites and currently comprises only 15 nominal species and one subspecies (Subías 2004(Subías , updated 2013.
The other genus studied here, Protoribates Berlese, 1908 is well defined by Weigmann et al. (1993), and is comparatively species rich as about 50 species were assigned to this genus (Subías 2004(Subías , updated 2013.
The third genus studied by us, Trachyoribates encompasses two subgenera, Trachyoribates Berlese, 1908 andRostrozetes Sellnick, 1925, species of both of which are mainly distributed in the tropical regions (see Subías 2004Subías , updated 2013. The main purpose of our paper is to describe and illustrate two new species of Haplozetes and Protoribates. Also, a detailed supplementary description of Trachyoribates (Rostrozetes) glaber (Beck, 1965) is presented on the basis of Ecuadorian specimens.

Materials and methods
The study materials are derived from the following two collecting sites: Specimens were studied in lactic acid, mounted in temporary cavity slides for the duration of the study, and then stored in 70% ethanol in vials. Body length was measured in lateral view, from the tip of rostrum to the posterior edge of ventral plate. Notogastral width refers to the maximum width in dorsal aspect. Lengths of body setae were measured in lateral aspect. All body measurements are given in micrometers. General terminology used in this paper follows that summarized by Norton and Behan-Pelletier (2009).
Type deposition. The holotype (in ethanol) is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; two paratypes (in ethanol) are deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; two paratypes (in ethanol) are in the personal collection of the first author.
Type deposition. The holotype (in ethanol) is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; three paratypes (in ethanol) are deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; two paratypes (in ethanol) are in the personal collection of the first author.
Etymology. The specific name "ecuadoriensis" refers to the country of origin, Ecuador.

Remarks.
In having the combination of main morphological characters (monodactylous legs; body of medium size; prodorsal setae long, simple, barbed; sensilli long, with lanceolate, ciliate head; four pairs of porose areas oval; adanal setae ad 1 longer than ad 2 , ad 2 longer than ad 3 ), Protoribates ecuadoriensis sp. n. is most similar to Protoribates oblongus (Ewing, 1909) from the Nearctic region (see Ewing 1909;Jacot 1937), however, the new species clearly differs from the latter by the presence of large tubercles on dorsal side of leg tarsi I and II.
Integument. Body color light brownish. Body surface foveolate (diameter of foveolae up to 4 on rostrum, up to 3 on notogaster and ventral side, up to 2 on medio-basal part  (Beck, 1965), adult: A anterior part of lamella (medio-distal part of lamellar seta not illustrated) B anterior part of lamella and tutoria, and prolamellar line dorsolaterally (medio-distal part of rostral and lamellar seta not illustrated) C rostral seta D lamellar seta E interlamellar seta F sensillus G bothridium and notogastral seta c H foveolae on rostrum I foveolae in central part of prodorsum J foveolae on notogaster K postanal porose area L left half of subcapitulum M palptarsus N anterior part of chelicera O right genital plate P right anal plate Q tarsus and anterior part of tibia of leg I, right, antiaxial view. Scale bar 10 μm. of prodorsum). Foveolae located densely on prodorsum, but sparse on notogaster and ventral side. Also microgranules present on prodorsum.

Remarks.
Actually the name of this species was first made available by Beck (1963) as Rostrozetes glaber, but its description was published later (Beck 1965). Judging on his brief description and illustrations, we identified our species as identical with Trachyoribates (Rostrozetes) glaber, known from Ecuador and Peru (see Beck 1965).
of Protoribates oblongus from personal collection, and Prof. Dr. Gerd Weigmann (Free University of Berlin, Institute of Zoology, Berlin, Germany) for valuable comments.
Oribatid mites were investigated as part of the Research Unit "Biodiversity and sustainable management of a megadiverse mountain ecosystem in South Ecuador", subproject "Soil fauna: Diversity and functioning" headed by Mark Maraun and Stefan Scheu; financial support by the German Research Foundation is gratefully acknowledged (RU 816).