Dorsosejugal Suture Research Articles

A new species of Pergalumna (Acari, Oribatida, Galumnidae) from Bolivia, with updated identification key to known species of the genus from the Neotropical region

A new species of Pergalumna (Oribatida, Galumnidae) is described from leaf litter of rain forest in the Espejillos environs near the Bolivian Ambor National Park. Pergalumna espejillosensis sp. nov. is similar to Pergalumna nasica Pérez-Íñigo & Baggio, 1980 in the presence of protruding rostrum, three pairs of rounded/oval notogastral porose areas and minute interlamellar seta, and in the absence of dorsosejugal suture, but differs by the smaller body length, setiform bothridial seta and long lamellar seta, and the absence of a median pore. An identification key to known species/subspecies of the genus from the Neotropical region is presented.

Two new and a newly recorded species of the genus Pergalumna (Acari, Oribatida, Galumnidae) from China

Two new species, Pergalumna clava n. sp. and Pergalumna pilosus n. sp., and a newly recorded species, Pergalumna amamiensis Aoki, 1984 of oribatid mites are described and illustrated from China. Pergalumna clava n. sp. is different from most known species of Pergalumna in the dorsosejugal suture complete; developed four pairs notogastral porose areas, Aa transverse irregular wedge; short interlamellar seta and bothridial seta clavate. Pergalumna pilosus n.sp. different from most known species of Pergalumna in the dorsosejugal suture complete; Aa porose area transverse irregular wedge; longer interlamellar barbed; median pore and postanal porose area present.

Contribution to the knowledge of the oribatid mite genus Angulogalumna (Acari: Oribatida: Galumnidae)

ABSTRACTA new species of the genus Angulogalumna (Oribatida, Galumnidae) is described from leaf litter in evergreen rain forest in the Montagne d’Ambre National Park of North Madagascar. Angulogalumna grishinae sp. nov. differs from Angulogalumna asiatica and Angulogalumna areolata by the presence of setiform bothridial seta, localization of lamellar seta medial to lamellar line, three pairs of notogastral porose areas, and notogastral porose area Aa elongate oval, A1 boomerang-form or banana-shaped, and by the absence of dorsosejugal suture and median pore. An identification key and data on distribution and ecology of known species of Angulogalumna are presented.http://www.zoobank.org/urn:lsid:zoobank.org:pub:E6193F26-F6AE-4759-9CA3-F6780D75452D

New Galumnidae (Acari, Oribatida) from Ecuador

Two new species of the oribatid mite family Galumnidae are described from Ecuador. Galumna napoensis sp. nov. differs from Galumna nonoensis Balogh, 1988 by the pointed rostrum and rostral setae distinctly longer than rostral setae, and the presence of tubercles posterior to dorsosejugal suture. Pergalumna finnamorei sp. nov. differs from Pergalumna lenticulata Ermilov & Friedrich, 2016 by the pointed rostrum, long interlamellar setae, stria forming reticulate pattern in anterior parts of prodorsum, notogaster and pteromorphs, rostral setae distinctly longer than rostral setae, localization of porose area Aa between la and lm, postanal porose area and reticulate epimere I, and the absence of foveoles on notogaster, pteromorphs and in anogenital region.

Systematics, genetics, and biogeography of intertidal mites (Acari, Oribatida) from the Andaman Sea and Strait of Malacca.

This study demonstrates for the first time the presence of marine‐associated mites in the Andaman Sea and Strait of Malacca and reveals a relatively high diversity of these taxa with six species from two different families: Selenoribatidae and Fortuyniidae. Indopacifica, a new genus of Selenoribatidae, is described from Thailand and Malaysia, with two new species, Indopacifica pantai n. sp. and Indopacifica parva n. sp. The genus is characterized by the unique combination of following characters: lacking lamellar ridges, incomplete dorsosejugal suture, fourteen pairs of notogastral setae, and presence of epimeral foveae. A phylogenetic reconstruction based on 18S ribosomal RNA sequences clearly confirms the distinctness of the new genus Indopacifica and places it close to the genus Rhizophobates. The lack of molecular genetic data of possible relatives impedes a clear assessment, and hence, we emphasize the need for further combined approaches using morphological and molecular genetic sequence data. All species show wide distribution areas within this geographic region suggesting that these taxa are good dispersers despite their minute size and wingless body. Molecular genetic data demonstrate recent gene flow between far distant populations of I. pantai n. sp. from the coasts of Thailand and two islands of Malaysia and hence confirm this assumption. The seasonally changing surface currents within this geographic area may favor hydrochorous dispersal and hence genetic exchange. Nevertheless, morphometric data show a slight trend to morphological divergence among the studied populations, whereas this variation is suggested to be a result of genetic drift but also of habitat differences in one population of Alismobates pseudoreticulatus.

New taxa of oribatid mites from Korup National Park (Cameroon).The genus Pergalumna (Acari, Oribatida, Galumnidae), with description of three new species and a key to known species from the Ethiopian region.

Three new species of oribatid mites of the genus Pergalumna (Oribatida, Galumnidae) are described from litter and soil in the Korup National Park (Cameroon). Pergalumna jenoi sp. nov. differs from P. margaritata Mahunka, 1989 and P. pseudomargaritata Mahunka, 1994 by the presence of simple dorsosejugal suture, dentate anterior margin of the ventral plate, distinct reticulate pattern on the pteromorphs and dense stria on the genital plates, the localization of setal alveoli la posterior to porose areas Aa, and the absence of a median pore. Pergalumna tuberclesejugalis sp. nov. differs from P. margaritata and P. pseudomargaritata by the larger body size, the localization of porose areas Aa closer to lm than la, and setal alveoli h3 close and lateral to A2, the presence of sejugal porose areas, and the absence of a median pore and stria on the genital plates. Pergalumna grebennikovi sp. nov. differs from P. bifissurata Hammer, 1972 by the larger body size, the presence of smooth bothridial setae, well-developed interlamellar setae, reticulate anterior margin of pteromorphs, comparatively long prodorsal median ridge and a median pore, and the localization of setal alveoli la and porose areas Aa. An identification key to the known species of the genus Pergalumna from the Ethiopian region is presented.

The Neotropical mite genus Neopilizetes (Oribatida: Galumnidae): redescription of N. neotropicus, rediagnosis of the genus, and descriptions of four new species.

Neopilizetes is a genus of the oribatid mite family Galumnidae that was first characterized by having well-developed setae, a dorsosejugal suture, and raised striae on the prodorsum and notogaster. It was proposed to accommodate Pilizetes neotropicus Balogh Mahunka 1978 from Brazil-the only supposed Pilizetes species known outside the Ethiopian Region-and it has remained monotypic. We found adults of N. neotropicus and four related species in soil-litter interface samples of a single cacao plantation in Ilhéus, Bahia, Brazil. Herein we: redescribe N. neotropicus; describe Neopilizetes thoracicus n. sp., Neopilizetes tigris n. sp., Neopilizetes triumnasus n. sp. and Neopilizetes unumnasus n. sp., and use this information to develop a new concept and expanded diagnosis of Neopilizetes. A key to the five species is provided, and we offer reasons for rejecting the classification of Neopilizetes as a subgenus of Pilizetes.

New data on oribatid mites (Acari, Oribatida) of Cameroon: results of the Joint German-Cameroonian scientific expedition (April 2016)

The present study is based on oribatid mite material (Acari, Oribatida) collected in 2016 from herbaceous-grassy vegetation from a ReviTec site, University of Ngaoundéré, Cameroon. A list of identified taxa, including 29 species from 23 genera and 12 families, is provided; of these, one species is new to science, one species (Pseudoamerioppia barrancensis) is recorded in the Ethiopian region for the first time, and all other species are recorded in Cameroon for the first time. A new subgenus of the genus Pilizetes Sellnick, 1937 (Galumnidae), Pilizetes (Pseudopilizetes) Ermilov subgen. nov., with type species Pilizetes (Pseudopilizetes) camerunensis Ermilov sp. nov., is described. The new subgenus differs from Pilizetes (Pilizetes) by the presence of setiform notogastral setae, a complete dorsosejugal suture and bothridial setae with unilaterally dilated heads.

Two new species of Eremellidae and Scheloribatidae (Acari, Oribatida) from the Kuma district of southern Japan

A new oribatid species of Eremellidae was described from litter at the bottom of a hollow Ilex oldhami Miq. tree in Kumamoto Prefecture, in southern Japan in a subtropical area. The new species has long lamellar ridges subpararelly connected by two translamellar ridges, rostral setae longer than lamellar setae, two pairs of adanal setae, and long solenidion o1 about four times as long as the length of the tibia. A key to all species of the genus Eremella is provided. Another new species, Scheloribates yamaeensis n. sp. was described from a chestnut plantation in Kumamoto Prefecture. The new species has a plicate integument, diverged sacculi, immovable pteromorphae with inward curve, a dorsosejugal suture, four pairs of genital setae, minute notogastral setae, adanal setae ad3 inserted in a preanal position, Tragardh’s organ, three claws of legs, and smooth fastigial setae of tarsus I.

A new species of the genus Pergalumna Grandjean, 1936 from Iran (Acari: Oribatida: Galumnidae)

A new species of galumnid mite (Acari: Oribatida: Galumnidae), Pergalumna persica sp. n., is described from Fars province, southern Iran. The new species is characterised by a pointed rostrum, minute interlamellar setae, medium long, setiform sensilla, with finely barbed, slightly dilated head, complete dorsosejugal suture, large, nearly elongate-triangular areae porosae Aa, absence of median pore, and large body size.

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.

A new species of the genus Pergalumna (Acari: Oribatida: Galumnidae) collected in moss on trees from Ethiopia

The oribatid mite genus Pergalumna Grandjean, 1936 (Acari: Oribatida: Galumnidae) comprises 111 species. We describe the species Pergalumna makarovae sp. nov., collected in moss on trees from Bale Mountains National Park (southern Ethiopia). The new species is distinguishable from other species of Pergalumna by the presence of the following character states in combination: smooth surface of body, clavate sensilli, minute interlamellar setae, three pairs of rounded notogastral areae porosae and complete dorsosejugal suture.

Oribatid mites of Liebstadia (Acari: Oribatida: Scheloribatidae) from Mongolia, with notes on taxonomy of the genus

Three new species of oribatid mites belonging to the genus Liebstadia are described from Mongolia. The new species are characterized by the poorly developed pteromorphae; the club-shaped head of the sensilli; the absence of the dorsosejugal suture; the dorso-ventral thickness, and the length and arrangement of notogastral setae. In addition, L. similis (Michael, 1888) is redescribed and recorded for the first time in Mongolia. Protoribates serratomarginatus Mahunka, 1983 is synonymized with L. similis. A key to the known species of the genus Liebstadia is given.

A New and Some Little Known Species of Eporibatula (Acari: Oribatida: Oribatulidae), with Remarks on Taxonomy of the Genus

Abstract A new species of oribatid mite belonging to the genus Eporibatula Sellnick is described from litter of larch plantation in Mt. Yatsugatake, Yamanashi Prefecture, Central Japan. The new species, Eporibatula variabilis sp. nov. differs from other species of the genus by the presence of ten pairs of notogastral setae, the short median and posterior notogastral setae, the wide lamellae, the well-developed humeral projection, and the weakly arched dorsosejugal suture. Two known species, E. tuberosa Fujikawa, 1972 and E. prominens Bayartogtokh et Aoki, 1998 from Japan and Mongolia, respectively are redescribed. In addition a revised diagnosis of the genus Eporibatula is proposed, and the taxonomic problems of some species belonging to this genus are discussed. The following new combinations are proposed: Eporibatula venusta (Berlese, 1908) comb. nov. and Eporibatula sakamorii (Aoki, 1970) comb. nov. A key to the known species of the genus Eporibatula is given.

Two New Species of Oribatid Mites from Baekrockdam of Mt. Halla in Cheju-do, Korea

The present work describes two new species, Ceratoppia clavisensillata sp. nov. and Astegistes hallaensis sp. nov., of oribatid mites (Acari: Oribatida) which were collected from Baekrockdam of Mt. Halla in Chejudo, Korea. C. clavisensillata sp. nov. shows the representative morphological characters of the genus Ceratoppia, but its clavate sensilli are distinguishable from all known congeneric species with filiform sensilli. A. hallaensis sp.nov. has various characters, namely, a rounded rostrum, ten pairs of notogastral setae, six pairs of genital setae, an indiscernible dorsosejugal suture and all legs tridactyle, etc.

A new mite of the genus Eupterotegaeus from Oregon (Cryptostigmata: Cepheidae)

Diagnosis. Rostrum rounded, with out median spine; lamellae large, projecting over rostrum, with broadly rounded lateral margins and sharp beak-like inner margins; a triangular projection mediad to pteromorphae along dorsosejugal suture: differing from E. spinatus in the lack of translamellar spine and from E. rostratus in the rounded rostrum and sharply pointed lamellar cusps, and from both in having a projection mediad of humeral processes on dorsosejugal suture and all legs monodactylous. The trivial name comes from the Greek meaning curving beak and refers to the sharply pointed lamellar cusps. Description. Dark reddish-brown color; prodorsum about twothirds as long as hysterosoma and approximately as long as broad; rostrum rounded with small lateral projections; rostral hairs simple, inserted in anterolateral margins of rostrum; lamellae over three times as long as broad of nearly equal width throughout, lamellar cusps ending in sharp incurved anterior medial tips resembling a beak; lamellar hairs simple, as long as width of lamellae, incurved, extended beyond tip of lamellae and inserted near anterolateral edge; interlamellar hairs missing in type specimen, their insertions mediad of pseudostigmata; pseudostigmata heavy, cup-shaped, with roughened edges, directed anterola terally; sensillus club-shaped, shorter than the distance between the pseudostigmata, about twice as long as lamellar hairs, with a finely setose tip; no exobothridial hairs observed on type specimen. Hysterosoma rounded, with roughened anterolateral pteromorphs projected anteriorly; a triangular projection mediad of pteromorphs along dorsosejugal suture; surface with a light rectangular pattern; nine pairs of short, marginal setae observed, each seta set on a raised tubercle; areae porosae or muscle attachment scars along lateral margins of hysterosoma (Fig. 1).