New records of carabid-associated mesostigmatic mites (Acari: Mesostigmata) from Ukraine with description of adults of Halodarcia carabidophila Evans and Fain, 1995 (Halolaelapidae)

New records of mesostigmatic mites (Acari: Mesostigmata) associated with carabid beetles (Coleoptera: Carabidae) from the Ukraine are presented. Two genera (Panteniphis Willmann, 1949, Halodarcia Karg, 1969) and six species (Panteniphis mirandus Willmann, 1949, Halodarcia carabidophila Evans and Fain, 1995, H. incideta Karg, 1969, Antennoseius calathi Fain, Noti and Dufrene, 1995, Anystipalpus labiduricola Lindquist and Moraza, 2009, Gaeolaelaps similisetae (Karg, 1965)) are recorded for the first time in the Ukraine. The adults of Halodarcia carabidophila obtained in the laboratory were described for the first time. A key to the females of Halodarcia species is also provided.


INTRODUCTION
The Mesostigmata (Gamasida) is a large, cosmopolitan assemblage of parasitiform mites that embraces an unusually diverse variety of lifestyles and habitats . Deutonymphs and adults of many families of Mesostigmata have established close phoretic relationships with other arthropods and, less commonly, with vertebrates (Krantz, 2009).
Over 95% species of arthropod-associated mesostigmatic mites are insect associates. The insect orders Coleoptera, Hymenoptera, Diptera and Lepidoptera are the primary hosts of mesostigmatid mites (Hunter and Rosario, 1988).
The fauna of arthropod-associated Mesostigmata in Ukraine is very poorly known. The purpose of this paper is to add new records of carabidassociated mesostigmatic mites from Ukraine and to describe unknown adults Halodarcia carabidophila.

MATERIALS AND METHODS
Carabid beetles were collected in various natural zones and administrative regions of Ukraine. Beatles were sampled by hand, by using Barber traps with bait and by using UV lamp (mercury tungsten blended lamp or mercury vapor lamp). Carabids were transferred into vials containing 70 % ethyl alcohol and later were examined with aid of a microscope MBS-9.
Mites collected from carabids were cleared in lactic acid and slide-mounted in Hoyer's medium. Morphology of mites was studied with the aid of a compound microscope, a Mikmed-1 Lomo equipped with a binocular head AU-12, ocular micrometer AM9-2 and digital camera DCM900. The morphological terminology generally follows Evans and Till (1979). Dorsal setae were labelled according to the system of Lindquist and Evans (1965), but our designations are preliminary. Dorsal pore-like structures, glandular openings (solenostomes) and poroids (lyrifissures) are indistinct and have been named as pores. Palpal and leg chaetotaxy follows Evans (1963aEvans ( , b, 1969. Measurements are given in micrometres (µm). Lengths of shields were taken from the anterior to posterior shield margins along the midline. The length of the second cheliceral segment was measured from the base to the apex of the fixed digit. Leg length was taken from the base of the coxa to the apex of the tarsus, excluding the ambulacrum.
For biological studies of Halodarcia carabidophila, well-fed and swollen deutonymphs (collected in the vicinity of Berezovka, 26 Mar. 2011, see examined material) were removed from carabids and placed into glass or plastic 25 ml jars, the lower part of which was filled with a solid mixture of gypsum and charcoal (according to Karg, 1971). High humidity was maintained in these vessels by frequently adding water to the gypsum-charcoal substrate. The mites developed at a temperature of about 20°C. The adult mites were obtained after two to seven days.
Remarks -P. mirandus is a rare edaphic species. Deutonymphs of P. mirandus was described by Gwiazdowicz (2000a) from Carabus sp. from Poland. We found carabids with mites only in riparian areas. Mites are phoretic under the elytra of beetles. The genus Panteniphis is new to the fauna of Ukraine. Karg, 1965 Genus Halodarcia Karg, 1969 Remarks -So far, four species of genus Halodarcia have been described world-wide, three of them from Europe -Halodarcia incideta Karg, 1969, H. porolata Karg, 1969, H. carabidophila Evans and Fain, 1995and H. kargi Nikolsky, 1982 from Asia (Karg, 1969;Nikolsky, 1982;Evans and Fain, 1995). Adult mites of the genus Halodarcia are free-living in litter and humus in damp or wet situations; deutonymphs, of at least some species, are subelytral phoretics of carabid beetles (Evans and Fain, 1995).
Description of male (n = 7) -Dorsum. Dorsal shield fused anteriorly and laterally with peritrematal shields, and fused posteriorly with ventrianal shield, length 456 -530, maximum width 353 -409. Surface of shield with faint scale-like ornamentation throughout (in contrast with that of female). Chaetotaxy as in female. Dorsal setae length 17 -27.

Key to the females of
Remarks -The species is new to the fauna of Ukraine.
Remarks -Mites of S. fimetarius were found on the ventral or dorsal side of beetles and under the elytra.

Antennoseius
Remarks -The species is known only from carabid beetles.
Remarks -The species is known only from carabid beetles.
Remarks -A. labiduricola was previously known only from the type series, wich was described from labidurid earwigs. The species is new to the fauna of Europe and Ukraine.