DESCRIPTION OF LARVA OF SEJUS HINANGENSIS (ACARI: MESOSTIGMATA: SEJIDAE) FROM THE FAR EAST OF RUSSIA

The mesostigmatic mite Sejus hinangensis Hirschmann and Kaczmarek, 1991 is recorded for the first time in the Far East of Russia. The first description of the larva of S. hinangensis and a key to larvae of the genus Sejus are provided. DOI: 10.21684/0132-8077-2016-24-2-175-17

ACAROID MITES OF NORTHERN AND EASTERN ASIA (ACARI: ACAROIDEA)

Acaroid mites (superfamily Acaroidea) are economically and veterinary important pests. We give a list of 5 families 49 genera, and 180 species of acaroid mites recorded in the Northern and Eastern Asia (Asian part of Russia, South Korea, Japan, and China). One new genus, Sphecacarus Klimov gen. n., is described. The following new synonymies and combinations are proposed: Tortonia Oudemans, 1911 (=Hyohondania Sasa, 1952, syn. nov.); Sancassania polyphyllae (Zachvatkin, 1941) (=Sancassania berteanaeursae Samšiňák, 1970 syn. nov.); Mezorhizoglyphus Kadzhaja, 1966 (=Boletacarus Volgin et Mironov, 1980 syn. nov.); Tortonia kanoi (Sasa, 1952) comb. nov. (from Hyohondania), Tortonia jinyunensis (Zhang at Li, 2003) comb. nov.(from Sinosuidasia)

A NEW SPECIES OF ORIBATID MITES OF THE GENUS PERSCHELORIBATES (ACARI, ORIBATIDA, SCHELORIBATIDAE) FROM СUBA

A new species of the genus Perscheloribates—P. (Perscheloribates) curiosus Ermilov sp. n.—is described and illustrated on the basis of adult specimens collected from leaf litter in forests of Сuba. The new species is morphologically most similar to P. (Perscheloribates) luzonensis Corpuz-Raros, 1980; however, it differs from the latter by the presence of bothridial setae pointed distally (vs. rounded), custodia (vs. absent) and well visible notogastral setae (vs. posterior setae hardly visible, other setae represented by alveoli)

REPORT ON ORIBATID MITES (ACARI, ORIBATIDA) FROM BRAZIL, WITH DESCRIPTION OF A NEW SPECIES OF THE GENUS PAPILLACARUS

An annotated checklist of identified oribatid mites from Brazil, including 28 species, 22 genera and 18 families, is provided. Eleven species are recorded for the first time in Brazil; of these, Papillacarus angulatus Wallwork, 1962 and Malaconothrus aureopunctatus Hammer, 1973 are recorded for the first time in the Neotropical region. A new species of the family Lohmanniidae, Papillacarus parapolysetosus Ermilov et Tolstikov sp. n., is described. This species is morphologically similar to Papillacarus polysetosus Ermilov, Anichkin et Wu, 2012 from Vietnam, however, it differs from the latter by the body size and length of some notogastral setae and by the band S2. An identification key to known Papillacarus-species from the Neotropical region is provided

THE DIVERSITY, MITE COMMUNITIES, AND HOST SPECIFICITY OF PYGMEPHOROID MITES (ACARI: PYGMEPHOROIDEA) ASSOCIATED WITH ANTS IN WESTERN SIBERIA, RUSSIA

This work discusses the diversity of mite communities along with host and attachment site specificities of myrmecophilous pygmephoroid mites (Acari: Pygmephoroidea) associated with most abundant ants (Hymenoptera: Formicidae) of Western Siberia. The researchers provide keys to myrmecophilous pygmephoroid mites of the families Neopygmephoridae and Scutacaridae of the Palaearctic and the keys to world species of the genera Caesarodispus Mahunka, 1977, and Unguidispus Mahunka, 1977 (Microdispidae). Petalomium aggtelekiensis Mahunka, 1977 and P. simplisetum Mahunka, 1986 are synonymized to P. chmelnickensis (Sevastianov, 1969), and P. carelitschensis (Sevastianov, 1967), respectively. DOI: 10.21684/0132-8077-2016-24-2-113-13

SUPPLEMENTARY DESCRIPTION OF TWO GALUMNID MITES, PERGALUMNA TSAVOENSIS AND P. BIFISSURATA (ACARI, ORIBATIDA, GALUMNIDAE)

Pergalumna tsavoensis Mahunka, 1986 and P. bifissurata Hammer, 1972 are redescribed on the basis of specimens from Zambia and Brazil, respectively. The dentate anterior tectum of epimere I in P. tsavoensis and microgranular body surface, rounded rostrum and absence of postanal porose area in P. bifissurata should be considered in any future identification of these species

SACCULOBATES INDICUS SP. N. (ACARI: ORIBATIDA: HERMANNIELLIDAE), A NEW SPECIES OF ORIBATID MITES FROM INDIA

A new hermanniellid oribatid mite species of the genus Sacculobates, S. indicus n. sp., from the Indian soil is described. The description is based upon the adult and tritonymphal instars. The adult instar of the new species differs from the both known species of the genus by the presence of epimeral neotrichy and the morphology of exuvial setae. An identification key to the known species of Sacculobates is provided

A NEW SPECIES OF ORIBATID MITES OF THE GENUS MALACONOTHRUS (ACARI, ORIBATIDA, MALACONOTHRIDAE) FROM VIETNAM

A new species of oribatid mites of the genus Malaconothrus, M. adilatatus sp. n., is described from Vietnam. It differs from M. heterotrichus by the body size, morphology of interlamellar and exobothridial setae ex1 and some epimeral and leg setae. An identification key to species of the genus Malaconothrus known from Vietnam is given

Results of Expeditionary Studies of the Onezhskiy Bay in the White Sea in September, 2019

Purpose. The purpose of the study consists in identifying the characteristic features of the distribution of hydrophysical and biogeochemical parameters of marine environment depending on the tide phases in the Onezhskiy Bay (the White Sea) in September. Methods and Results. In the cruise of the R/V «Ekolog» (September 6–11, 2019), synchronous integrated hydrological and biogeochemical studies were for the first time performed in the Onezhskiy Bay depending on the phase of a tidal cycle in September. The standard methods applied for this purpose included two sections in the White Sea, namely along the Western Solovetskaya Salma Strait and through the Onezhskiy Bay from north to south. This permitted to determine the chlorophyll a and nutrients contents, the taxonomic composition, abundance and biomass of phytoplankton including its vertical distribution within the photic zone, as well as the qualitative and quantitative composition of zooplankton. Organic forms of nitrogen (0.62–0.83 mg/l) prevailed among the nutrients in the Onezhskiy Bay, the contents of Pmin and Porg were close (on average 9 μg/l), the concentration of phosphorus mineral forms was predominant in the water bottom layer at the deep-sea stations. In the Western Solovetskaya Salma, the phytoplankton biomass average values during high and low water were 6.75 ± 1.18 mg C/m3 and 10.25 ± 11.34 mg C/m3, and in the Onezhskiy Bay – 8.07 ± 2.43 mg C/m3 and 16.61 ± 13.54 mg C/m3, respectively. Phytoplankton was represented by diatoms, dinophytes, cryptophytes and dictyochas. In the southern part of the Onezhskiy Bay, a significant increase in the abundance of all common zooplankton species was found at night. Conclusions. In the area under study, the impact of the tidal cycle phases on spatial and temporal variability of the marine environment characteristics was manifested in a change in the thickness of the layer of temperature and salinity surface anomalies; position of the Onezhskiy frontal section shifted by 8–9 km; the changes in the nitrites, ammonium ions and chlorophyll a concentrations, and also in the phytoplankton biomass were statistically insignificant; the composition of dominant phytoplankton species did not change; the horizontal distribution of zooplankton, primarily its warm- forms, corresponded to the water temperature horizontal gradient: in the southern part of the Onezhskiy Bay, the abundance of boreal species is by orders of magnitude higher than that near the boundary with the basin