Alexander E. Anichkin

The Galumnoid fauna (Acari: Oribatida) of Cat Tien National Park (Southern Vietnam) with description of two new species

ABSTRACT We have registered 11 species, five genera, two families, of Galumnoidea in Cat Tien National Park (southern Vietnam). Genera Leptogalumna Balogh, 1960 and Neogalumna Hammer, 1970 are the first records for Vietnam. Two new species Pergalumna indistincta n. sp. and Galumna pseudokhoii n. sp. are described from dark loamy soil of Lagerstroemia forest. P. indistincta n. sp. is similar in notogastral indistinct areae porosae, punctate body surfaces, morphology of prodorsal setae, and incomplete dorsosejugal suture only to Pergalumna amorpha Mahunka, 2008 from Thailand, but differs by body size, morphology of notogastral areae porosae, and development of adanal setae ad 2. G. pseudokhoii n. sp. is very similar in location and morphology of notogastral areae porosae, morphology of rostral, lamellar, and interlamellar setae; location of lamellar lines; and incomplete dorsosejugal suture to Galumna khoii Mahunka, 1989 from Vietnam, but differs by body size, morphology of sensilli, and number of genital setae on anterior parts of genital plates.

Oribatid mites of the genera Epilohmannia, Furcoppia and Unguizetes (Acari: Oribatida: Epilohmanniidae; Astegistidae; Mochlozetidae) from Vietnam

Abstract Three new species of oribatid mites, Epilohmannia crassisetosa sp. nov., Furcoppia cattienica sp. nov. and Unguizetes asiaticus sp. nov., are described. All three are from dark loamy soil of Lagerstroemia forest in the Cat Tien National Park (southern Vietnam). The species E. pallida pacifica Aoki and U. sphaerula (Berlese) are newly recorded in Vietnam. Diagnostic keys to the Vietnamese species of Epilohmannia and Unguizetes are presented. Mochlozetes atypicus Mahunka, 1982 is reinstated in the genus Unguizetes.

Taxonomic study of oribatid mites (Acari, Oribatida) of Bi Dup—Nui Ba National Park (southern Vietnam)

A list of oribatid mite taxa from six localities of Bi Dup-Nui Ba National Park (southern Vietnam) is provided. It includes 89 species/subspecies, 68 genera, and 40 families, of these 23 species, two subgenera, 15 genera and seven families are recorded for the first time in Vietnam. Three species (Elaphoppia quadripilosa, Exoribatula cf. longior, Allogalumna (Allogalumna) rotundiceps), one subgenus (Lohamnnia (Carolohmannia) and one genus (Elaphoppia) are recorded for the first time in the Oriental region. Fourteen new species, Lohmannia (Carolohmannia) monosetosa sp. nov., Tectodamaeus heterotrichus sp. nov., Allosuctobelba vietnamensis sp. nov., Epieremulus bidupensis sp. nov., Dolicheremaeus insolitus sp. nov., Fissicepheus striganovae sp. nov., Tegeocranellus martinezi sp. nov., Anachipteria svetlanae sp. nov., Indoribates (Indoribates) bicarinatus sp. nov., Peloribates tatyanae sp. nov., Neoribates (Neoribates) monodactylus sp. nov., Allogalumna (Allogalumna) paramachadoi sp. nov., Galumna (Neogalumna) longilineata sp. nov., G. (N.) tolstikovi sp. nov., are described. The taxonomic status of the two galumnid genera, Neogalumna and Globogalumna, is discussed: Neogalumna is proposed as the subgenus Galumna (Neogalumna) stat. nov.; Globogalumna is proposed as the subgenus Allogalumna (Globogalumna) stat. nov. An identification key to the known species of Galumna (Neogalumna) is given.

Two new species of oribatid mites of the family Galumnidae (Acari, Oribatida) from Vietnam

Abstract Two new species of oribatid mites of the family Galumnidae, Allogalumna monodactyla sp. n. and Galumna (Galumna) paracalcicola sp. n., are described from dark loamy soil under crown of Ficus sp. in southern Vietnam. Allogalumna monodactyla sp. n. is the first identified member of Allogalumna recorded for Vietnam. The identification keys to the species of Allogalumna from the Oriental region and species of Galumna (Galumna) from Vietnam and the calcicola-group are given.

Oribatid mites (Acari: Oribatida) from acacia and pine plantations in southern Vietnam, with description of a new species of the subgenus Galumna (Cosmogalumna)

Abstract An annotated checklist of oribatid mite taxa from acacia and pine plantations of Dong Nai Culture and Nature Reserve (Southern Vietnam) is presented. The species Ctenacarus araneola, Nehypochthonius porosus,Scheloribates mahunkai, Scheloribates kraepelini, Indoribates panabokkei, genera Ctenacarus,Nehypochthonius and families Ctenacaridae and Nehypochthoniidae are first records from Vietnam, and of these Nehypochthoniidae, Nehypochthonius and Nehypochthonius porosus are first records from the Oriental region. A new oribatid mite species, Galumna (Cosmogalumna) dongnaiensis sp. nov. (Galumnidae), is described from soil in a pine plantation. The new species is distinguishable from all species of the subgenus Galumna (Cosmogalumna) by the sculpturing of the prodorsum and pteromorphs and the number of notogastral porose areas.

COLLECTION OF ORIBATID MITES (ACARI: ORIBATIDA) FROM DONG NAI BIOSPHERE RESERVE OF SOUTHERN VIETNAM, WITH DESCRIPTION OF THREE NEW SPECIES

Abstract. The present study is based on materials collected during Russian-Vietnamese expedition in July 2012 in Dong Nai Biosphere Reserve of Southern Vietnam. An annotated checklist of oribatid mite taxa from tropical forest is presented. It includes 113 species from 74 genera and 38 families. Carabodes samoensis, Mochlozetes ryukyuensis, Otocepheus excelsus, Pergalumna hauseri, Suctobelbella sexsetosa, Tuberemaeus perforatoides and the genera Carabodes, Mochlozetes are first records from Vietnam; C. samoensis and M. ryukyuensis are recorded for the first time from the Oriental region. Three new species - Dolicheremaeus contactus sp. nov. (Tetracondylidae), Unguizetes latus sp. nov. (Mochlozetidae) and Galumnella tiunovi sp. nov. — are described from soil. Dolicheremaeus contactus sp. nov. is distinguishable from other species of the genus by the presence of the following character states in combination: sensilli bacilliform; all condyles present, and lateral prodorsal and notogastral condyles densely contacted with each other; 10 pairs of notogastral setae of medium size, straight, barbed; adanal lyrifissures located in paraanal position; adanal setae inserted nearly to margin of the ventral plate. Unguizetes latus sp. nov. is distinguishable from other species of the genus by the presence of the following character states in combination: sensili clavate; rostrum rounded; distinct translamella absent; lamellae with lateral tooth; prolamellar line developed; pteromorphs well developed; porose areas A1 rounded, Aa, A2, A3 oval; five pairs of genital plates present. Galumnella tiunovi sp. nov. is distinguishable from other species of the genus by the presence of the following character states in combination: prodorsum with two large teeth laterally; sensilli setiform; rostral setae developed, lamellar and interlamellar setae represented by alveoli; body surface microfoveolate, without reticular pattern; genital setae inserted in two rows on each plate; postanal porose area absent.

A new species of Oribatella (Acari: Oribatida: Oribatellidae) from Vietnam, including a key to species of the genus from the Oriental region

A new oribatid mite species, Oribatella umaetluisorum sp. nov. (Oribatellidae), is described from Cat Tien National Park (southern Vietnam). It was collected in the dark loamy soil of Lagerstroemia forest. Oribatella umaetluisorum sp. nov. has bidentate rostrum, clavate sensilli, microfoveolate body surface, striate epimeral region, serrate anterior margins of pteromorphs and length of notogastral setae, similar only to Oribatella sculpturata from Vietnam, but these species clearly differ by the body size, integumental ornament, shape of basal part of lamellae and distal part of tutoria and the number of leg claws. An identification key to species of Oribatella of the Oriental region is presented.

The family Ctenobelbidae (Acari, Oribatida), with description of a new species and discussion on systematic placement and taxonomic status of the genus Berndamerus Mahunka, 1977.

Abstract The oribatid mite genus Berndamerus Mahunka, 1977 is transferred into the family Ctenobelbidae as the subgenus Ctenobelba (Berndamerus) Mahunka, 1977, stat. n. from the family Amerobelbidae. The known species of Berndamerus combined: C. (B.) bicostata (Berlese, 1910), comb. n., C. (B.) eremuloides (Berlese, 1910), comb. n., C. (B.) hellenica (Mahunka, 1977), comb. n. A new species, Ctenobelba (Berndamerus) bugiamapensis sp. n., is described from soil, Bu Gia Map National Park, southern Vietnam. It differs from the other species of the subgenus by the heterotrichy of notogastral setae, presence of adanal neotrichy and localization of adanal lyrifissures. Ctenobelbidae is recorded in Vietnam for the first time. A new diagnosis of the family Ctenobelbidae and the identification keys to the known subgenera of the genus Ctenobelba and species of the subgenus Ctenobelba (Berndamerus) are provided.

Stable isotope composition (δ13C and δ15N values) of slime molds: placing bacterivorous soil protozoans in the food web context

RATIONALE Data on the bulk stable isotope composition of soil bacteria and bacterivorous soil animals are required to estimate the nutrient and energy fluxes via bacterial channels within detrital food webs. We measured the isotopic composition of slime molds (Myxogastria, Amoebozoa), a group of soil protozoans forming macroscopic spore-bearing fruiting bodies. An analysis of largely bacterivorous slime molds can provide information on the bulk stable isotope composition of soil bacteria. METHODS Fruiting bodies of slime molds were collected in a monsoon tropical forest of Cat Tien National Park, Vietnam, and analyzed by continuous-flow isotope ratio mass spectrometry. Prior to stable isotope analysis, carbonates were removed from a subset of samples by acidification. To estimate the trophic position of slime molds, their δ(13) C and δ(15) N values were compared with those of plant debris, soil, microbial destructors (litter-decomposing, humus-decomposing, and ectomycorrhizal fungi) and members of higher trophic levels (oribatid mites, termites, predatory macroinvertebrates). RESULTS Eight species of slime molds represented by at least three independent samples were 3-6‰ enriched in (13) C and (15) N relative to plant litter. A small but significant difference in the δ(13) C and δ(15) N values suggests that different species of myxomycetes can differ in feeding behavior. The slime molds were enriched in (15) N compared with litter-decomposing fungi, and depleted in (15) N compared with mycorrhizal or humus-decomposing fungi. Slime mold sporocarps and plasmodia largely overlapped with oribatid mites in the isotopic bi-plot, but were depleted in (15) N compared with predatory invertebrates and humiphagous termites. CONCLUSIONS A comparison with reference groups of soil organisms suggests strong trophic links of slime molds to saprotrophic microorganisms which decompose plant litter, but not to humus-decomposing microorganisms or to mycorrhizal fungi. Under the assumption that slime molds are primarily feeding on bacteria, the isotopic similarity of slime molds and mycophagous soil animals indicates that saprotrophic soil bacteria and fungi are similar in bulk isotopic composition.

A new species of Protoribates (Acari: Oribatida: Haplozetidae) from southern Vietnam

ABSTRACT Protoribates heterodactylus n. sp. is proposed and described. This species was collected in sandy soil of Dipterocarp forest from Cat Tien National Park (southern Vietnam). The new species is similar in body size, morphology of sensilli, long adanal setae ad 1, ad 2, and bidactylous legs only to Protoribates luteus (Hammer, M. 1979. Investigations on the oribatid fauna of Java. Det Kgl. Danske Vidensk. Selsk. Biol. Skrifter. 22(9): 1–72.) from Java Island, but differs from that species by thick rostral, lamellar and epimeral (3b, 4a) setae.