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Some Oribatid Mites (Acarina: Cryptostigmata) from Meghalaya with Description of Three New Species
... In India, till 2003, 425 species/subspecies of Oribatida were recorded and distributed over more than 200 genera under more than 75 families (Sanyal, 2003a).The European acarologist Pearce (1906) first made faunistic studies on the oribatid mites from soils of the Sikkim Himalaya. Later the knowledge was enriched to some extent by the works of Bayoumi and Mahunka (1979a, 1979b), Mishra, Bhaduri, Raychaudhuri (1982, Subias and Sarkar (1982, 1984, Sanyal (1988), Bodjema et al. (1991), Chakrabarty and Bhattacharya (1992) and Bhattacharya and Chakrabarti (1995).The major contribution on soil oribatid mites from North eastern states of Meghalaya, Tripura, Manipur and Nagaland were by Sanyal (1995Sanyal ( , 2000Sanyal ( , 2004Sanyal ( , 2006. Numerous studies on the diversity and abundance of soil mites in relation to various edaphic and environmental factors of India has been found in the recent literature by various workers such as Banerjee et al. (2009), Moitra et al. (2012), Rakshit and Chanda (2017), Ghosh and Mandal (2017), Ghosh (2018). ...
... Subsequently, they described the specimen Hoplophthiracarus indicus as new to science. Later Sanyal (1988) took on the mantle and recorded seven species belonging to seven genera under six families from Meghalaya. Of these, three species viz., Mesotritia indica, Euphthiracarus meghalayensis and Eremobelba shillongensis were described as a new record and four other species Rhysotritia ardua(Koch) var.otaheitensis, ...
The diversity and abundance of soil organisms significantly contribute to the ecosystems as well as in human welfare as we are very much dependent on the productivity of the soil. The oribatid mites are one of the most abundant species of soil microarthropods, spread all over the world and their effective role in soil ecological processes is indeed significant. Moreover, NorthEast (N-E) India is a hub of diverse life forms and rich in en-demism with comprehensive ecological habitats that make it suitable to harbour a large number of organisms. The richness of soil mites in this region of the country has not been explored adequately and most of the part remains unexplored due to lack of survey, awareness of its beneficial role and scientific vigilance. In spite of the richness and abundance of fauna in this part of Indian subcontinent the acarine fauna of this region remain unattended by the acarologists for the reasons best known to them. The present work is a review article on oribatid soil mites and is based mainly on the work done so far and recent studies from northeastern states along with the records of its distribution and abundance to enhance the knowledge about this soil micro fauna, their distribution, impacts on soil health and gap areas that need to be explored in future.
... Locality of E. meghalayensis: India, Meghalaya, Shillong, 1929 m, pine forest, 3 specimens (SANYAL 1988 This species was described from Singapore. I have found one specimen from almost the same locality. ...
... Apoplophora triquetra n. sp. 1, 3, 7 adult (holotype); 2, 4-6 tritonymph. 1prodorsum, dorsal view, 2 -prodorsum, lateral view, 3 -ventral region, 4 -prodorsum, dorsal view, 5 -ventral region, 6 -notogaster, lateral view, 7 -lateral view of body Sanyal, 1988(after Sanyal 1988. 1 -prodorsum, dorsal view, 2ventral region, 3 -lateral view of body; 4-8. Austrotritia singaporensis n. sp. ...
A supplement to the monograph on ptyctimous mites of Oriental Region (NIEDBA£A 2000), presents diagnoses of the species described in the papers published after 1998 and a few species described in the papers published before this year. Analysis of a few dozen samples with ptyctimous mites from different areas of Oriental Region has enriched the number of species from the region by 7 species new to science. These new species are: Mesoplophora (Mesoplophora) frogneri n. sp., Apoplophora kapiti n. sp., Apoplophora sarawaki n. sp., Apoplophora serrata n. sp., Apoplophora triquetra n. sp., Austrotritia singaporensis n. sp., and Phthiracarus pondoklowii n. sp. The species Euphthiracarus meghalayensis SANYAL, 1988 has been declared conspecific with Euphthiracarus pakistanensis HAMMER, 1977 and Pthiracarus (Archiphthiracarus) hirsutus FUJIKAWA, 2003 with Phthiracarus setosus (BANKS, 1895). From among the 39 already known species, 12 were known only from the original description and these have been subjected to detailed morphological analysis revealing or allowing more accurate specification of some morphological features, included in the redescriptions presented in this paper. New localities have been specified for the following species: O. chichijimensis, E. meghalayensis, P. globosus, and A.(A.) clavatus, extending their hitherto geographical ranges. In total the supplement presents 45 species, including 8 Mesoplophoridae, 16 Euphthiracaroidea, and 21 Phthiracaroidea.
The morphological ontogeny of Eremobelba geographica Berlese, 1908 is described and illustrated. This species was investigated mainly in ecological and biological aspects. It inhabits forest soils and cultivated areas, but is not abundant, and adults dominate in extracted samples. In the juveniles, the prodorsal seta in is short, and the bothridial seta is setiform. The nymphs are quadrideficient and eupheredermous, i.e. they carry exuvial scalps of the previous instars, using a cornicle. Paraproctal setae occur in all juvenile instars, which is rare in Brachypylina, and hypertrichy occurs in the aggenital region of the deutonymph, tritonymph and adult, and adanal region of the adult. In all instars, seta d on all genua and tibiae is present, except for tibia I of adult.
The present study is based on ptyctimous oribatid mite material (Acari, Oribatida) collected in Nepal in 1980 and 1995. A list of identified taxa, including 18 species from 12 genera and five families, is provided; of these, Apoplophora pantotrema, Euphthiracarus carinatus, Phthiracarus boresetosus and Ph. setosus are recorded for the first time in the Nepalese fauna. Two new species of the genus Plonaphacarus (Steganacaridae) are described: P. diutissimus Niedbała sp. nov. differs from P. machadoi (Balogh, 1958), P. tanzicus (Mahunka, 1993), P. ngongi Niedbała, 2001 and P. styphelos Niedbała, 2001by the length of lamellar and notogastral setae, number of notogastral lyrifissures, and the morphology of setae d on leg femora I; P. pugionis Niedbała sp. nov. differs from P. kaluzi Niedbała, 2013 by the morphology of sensilli, arrangement of notogastral setae c1–3, length of subcapitular setae h, morphology of adanal setae ad2, and the localization of setae d on leg femora, and from H. similis Niedbała, 2000 by the shape of sensilli, rostral and notogastral setae and arrangement of notogastral setae c1-3. The supplementary description of Euphthiracarus carinatus Liu, Wu & Chen, 2011 (Euphthiracaridae) is given.
Two new species of the family Oribotritiidae, Mesotritia solhoyi sp. nov. from Tibet, China and Oribotritia krivolutskyi sp. nov. from Azerbaijan, are described and illustrated. Mesotritia solhoyi is distinguished from the related species by the presence of one pair of anal setae, three pairs of adanal setae, and 8–10 pairs of long genital setae; weakly fusiform head of sensilli; rostral and lamellar setae situated at the same level. Oribotritia krivolutskyi is similar to O. submolesta, but differs by different number of lateral carinae; much longer aggenital setae; longer sensilli, interlamellar and lamellar setae; shorter notogastral setae; setae ps2 and ps3 thick and rigid; setae ad2 placed more close to ad3 than to setae ad1 , slightly different shape of sensilli.
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