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# In memoriam Neculai Alexandru Vasiliu (1935 – 2023)

Otilia Ivan

► To cite this version:

Otilia Ivan. In memoriam Neculai Alexandru Vasiliu (1935 – 2023). Acarologia, 2024, 64 (3), pp.919-924. 10.24349/qok2-4dvc. hal-04677516

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Acarologia

Open Science
in Acarology

# In memoriam Neculai Alexandru Vasiliu (1935 – 2023)

Otilia Ivan*

## Obituary

<figure><img src="image_3.png" /></figure>

Dr. N. A. Vasiliu, at his desk, many years after his official retirement (2010).

The end of 2023 brought a great loss and a lot of sadness among researchers in the field of acarology and zoology, with the passing away of Dr. Neculai Alexandru Vasiliu, one of the pioneers in the study of mites, especially Oribatida, in Romania. He had a long and fruitful career in this field, with achievements that made him known in the country and abroad.

N. A. Vasiliu was born on November 25, 1935 in Iași. He spent his childhood years in Ștefănești, Botoșani county, a village on the banks of the Prut river with a varied and particularly beautiful landscape, and he was fascinated by living beings, by nature, even from this young age. He attended primary school in his home village, and the secondary and high school in Iași. Regarding the university, his first option was to study forestry, but he was not accepted in those days (the first years of the communist regime in Romania), because his parents were landowners. Therefore, he attended the Biology - Geography Faculty of “Al. I. Cuza” University in Iași and graduated in 1960. After graduation, as was required at that time, he worked as a teacher (1960-1962), then as a biologist at the Antibiotics Factory in Iași (1962-1964).

Then he successfully applied for a position in the Institute of General and Applied Biology in Iași (later Institute of Biological Research) and at the beginning of 1965 joined the Ecology

Received 26 July 2024

Accepted 07 August 2024

Published 23 August 2024

Corresponding author

Otilia Ivan* : otilia.ivan@ymail.com

Academic editor

Kreiter, Serge

https://doi.org/10.24349/qok2-4dvc

ISSN 0044-586X (print)

ISSN 2107-7207 (electronic)

<figure><img src="image_4.png" /><figcaption>Ivan O.</figcaption></figure>

Licensed under

Creative Commons CC-BY 4.0

<footnote><sup>a</sup>Department of Experimental and Applied Biology, Institute of Biological Research Iași - National Institute of Research and Development for Biological Sciences, Bucharest, Romania.</footnote>

<footnote><sup>b</sup>Institute of Biological Research, 47 Lascăr Catargi, 700107 Iași, Romania.</footnote>
and Fauna team established by Professor Zicman Feider. Therefore, this was the beginning of his activity as a researcher in the field of acarology, under the guidance of Professor Z. Feider. In the first years he worked with his teacher on Labidostomatidae (Trombidiformes), with notable results, as shown in the List of publications.

A few years later, he started studying oribatids, together with his new colleague Magda Călugăr, under the supervision of Professor Feider. In these years, under the coordination of the Romanian Academy, they conducted studies on the oribatid fauna in some regions of Romania, e. g. Iron Gates area, before it was flooded for the construction of the reservoir and the hydropower plant. In the same period, he started the doctoral internship, which he completed in 1976, when he gained the PhD degree with the thesis "Contributions to the knowledge of oribatid mites (Acari) from the Moldova river basin", supervised by Professor Feider.

In 1970 he made a study and documentation visit to Hungary, to the Institute of Zoology, the Institute of Parasitology and the National Museum of Natural History in Budapest. Also, in 1975, he went on another study visit to Warsaw, at the Institute of Ecology of the Polish Academy of Sciences. Following these visits, new ideas emerged regarding the organization of the research work on edaphic mesofauna and the entire terrestrial ecology department. Practically, in those years, together with his colleagues Drs. Magda Călugăr, Marina Huțu (who studied Uropodina mites) and Felicia Bulimar (specialist in Collembola) made the transition from the qualitative study of soil fauna to the ecological, quantitative one, correlated with other factors or parameters within the ecosystem.

A period of intense and fruitful activity followed, with numerous and varied research projects, correlated with the priorities of that time. Together with his colleagues, he carried out ecological investigations in various types of ecosystems, both natural and anthropogenic or affected by industrial pollution. In parallel, he deepened the knowledge of the oribatid fauna and described many new species. During this period, he actively collaborated with other research teams from Romania, which brought emulation in his activity and remarkable results. The long collaboration with the Institute de Speleology "Émile Racovitza" from Bucharest is notable, resulting in a series of articles on the oribatid fauna of Cuba and Israel, including the description of many new species (see the List of publications).

Dr. N. A. Vasiliu was interested in attracting young researchers to take over and carry on his work. He was a mentor to a number of young researchers, whom he inspired, guided and supported in their professional development and generously shared his knowledge and experience.

Dr. Vasiliu was a passionate scientist who, although he retired in 1998, continued his work until 2018, during which time he published 19 articles. In these years, he focused especially on oribatid mites of the Oppiidae family. He was interested in all new publications related to this group and meticulously made notes on them. Lately, he was working on an improved classification system for these oribatid mites, a project that he did not manage to complete.

Beyond his research work, Dr. Vasiliu had a true profile of naturalist, with remarkable geographical, geological, plant and animal knowledge, which he developed over the years in numerous expeditions throughout the country. Also, from his youth he was passionate about hunting and fishing, the latter remaining a hobby for his whole life. He had amazing knowledge and observations about the ecology, biology and ethology of many fish species, unfortunately not published.

He was an optimistic person, with positive thinking, ready to offer help, a suitable advice, or to encourage younger colleagues. I am one of those young people once, who continued the research activity in the field of acarology, and I wrote this paper with all my gratitude and as a final tribute to Dr. Vasiliu.

ORCID

Otilia Ivan https://orcid.org/0000-0001-5535-4162
List of publications (in chronological order)

Feider Z., Vasiliu N. 1968. *Nicoletiella romanica* n. sp. (Acariformes), une nouvelle espèce d'acarien de litière. *Revue Roumaine de Biologie, série de Zoologie*, 13 (1): 34-41.

Feider Z., Vasiliu N. 1968. Un nouveau genre de la famille Nicoletiellidae Canestrini, 1891 et description de l'espèce *Grandjeanellina nova* (Sellnick, 1931). *Travaux du Muséum d'Histoire naturelle "Grigore Antipa"*, 8: 641-662.

Feider Z., Vasiliu N. 1968. *Labidostomma nepalense* (Nicoletiellidae) une nouvelle espèce asiatique. *Acarologia*, 10 (4): 630-644.

Feider Z., Vasiliu N. 1969. Revision critique de la famille Nicoletiellidae. In: Evans G.O. (Ed.). *Proceedings of the 2nd International Congress of Acarology: Sutton Bonington, England, 1967: Akademiai Kiado, Budapest*. p. 201-207.

Feider Z., Vasiliu N., Călugăr M. 1969. Contributions to the knowledge of oribatid mites from Iron Gates area (Romania). *Studii şi cercetări de Biologie, Zoology series*, 21 (6): 407-419 (in Romanian).

Feider Z., Vasiliu N. 1970. Espèces de Nicoletiellidae (Acariformes) de Roumanie. In: Orghidan T. et al. (Eds.). *Livre du Centenaire, Émile G. Racovitza, 1868-1968. Bucarest: Editions de l'Académie de la République Socialiste de Roumanie*. p. 371-391.

Feider Z., Vasiliu N. 1970. Six espèces de Nicoletiellidae d'Amérique du Sud. *Acarologia*, 12 (2): 282-309.

Feider Z., Vasiliu N., Călugăr M. 1970. Trois espèces nouvelles de la famille des Oribatulidae Thor, 1929 (Oribatei). *Revue Roumaine de Biologie, série de Zoologie*, 15 (5): 293-313.

Feider Z., Vasiliu N., Călugăr M. 1970. Les stases de développement de *Zygoribatula mariehammerae* n. sp. (Oribatei) et une nouvelle nomenclature de la chétotaxie de l'idiosoma. *Analele Științifice ale Universității "Al. I. Cuza" Iași, section II, Biology*, 16 (2): 285-295.

Feider Z., Vasiliu N., Călugăr M. 1971. Un nouveau genre et une nouvelle espèce de la famille Mycobatidae (Oribatei). *Revue Roumaine de Biologie, série de Zoologie*, 16 (5): 299-307.

Feider Z., Vasiliu N., Călugăr M. 1971. *Minunthozetes semirufus* (C. L. Koch, 1841), a new species for Romanian fauna, and redescription of the species *Minunthozetes pseudofusiger* (Schweizer, 1922). *Studii şi cercetări de Biologie, Zoology series*, 23 (5): 409-418 (in Romanian).

Feider Z., Vasiliu N. 1972. Zoological collectings by the Hungarian Natural History Museum in Korea. 6. *Quelques Nicoletiellidae de Corée du Nord (Acari). Annales Historico - Naturales Musei Hungarici*, 64: 375-385.

Feider Z., Călugăr M., Vasiliu N. 1972. Contribution to the knowledge of oribatid mites (Oribatei) from Retezat National Park and Western Jiu Depression. *Ocotirea Naturii*, 16 (1): 5-12 (in Romanian).

Feider Z., Călugăr M., Vasiliu N. 1973. Fauna of oribatid mites (Acari) from litter of forest protection curtains at Valul lui Traian. *Studii şi cercetări de Biologie, Zoology series*, 25 (1): 25-32 (in Romanian).

Vasiliu N., Călugăr M., Huțu M. 1973. Contribution à la connaissance des Oribates hôtes intermédiaires de *Moniezia* des pâturages du bassin de la rivière Jijia. *Archiva Veterinaria*, 9 (12): 205-224.

Vasiliu N., Călugăr M. 1973. Deux nouvelle espèces de la Superfamille Oribatuloidea Woolley, 1965 (Acari: Oribatei). *Revue Roumaine de Biologie, série de Zoologie*, 18 (5): 325-332.

Vasiliu N. 1973. Contributions to the knowledge of oribatid mites (Acari, Cryptostigmata) from Rarău Massif. *Studii şi comunicări, Museum of Nature Sciences, Bacău*, 6: 11-39 (in Romanian).

Feider Z., Vasiliu N., Călugăr M. 1974. Nouvelle contribution à l'étude des Nicoletiellides d'Amérique du Sud. *Acarologia*, 16 (3): 413-427.

Feider Z., Vasiliu N., Călugăr M. 1975. *Oribatei (Acari). In: Ionescu M. (Ed.). Complex research group Iron Gates, monographic series. Fauna. Bucharest: Romanian Academy Press*. p. 55-59 (in Romanian).

Călugăr M., Vasiliu N. 1976. Nouvelles espèces d'Oribates (Acari: Oribatei). *Revue Roumaine de Biologie, série de Biologie animale*, 21 (1): 13-18.

Vasiliu N., Călugăr M. 1976. Nouveaux Oribates (Acari: Oribatei Dugès, 1834) de Roumanie. *Revue Roumaine de Biologie, série de Biologie animale*, 21 (2): 97-101.

Vasiliu N., Călugăr M. 1977. Oribates nouveaux de la Sierra de la Gran Piedra - Cuba. In: Orghidan T., Núñez Jiménez A., Decou V., Negrea Șt., Viña Bayés N. (Eds.). Résultats des expéditions biospéologiques Cubano - Roumaines à Cuba, volume 2. Bucharest: Romanian Academy Press. p. 241-246.

Călugăr M., Vasiliu N. 1977. Contribution à la connaissance des Oribates hypogées de Cuba. In: Orghidan T., Núñez Jiménez A., Decou V., Negrea Șt., Viña Bayés N. (Eds.). Résultats des expéditions biospéologiques Cubano - Roumaines à Cuba, volume 2. Bucharest: Romanian Academy Press. p. 247-256.

Călugăr M., Vasiliu N. 1979. Modifications morphologiques de l'organe trichobothrial durant l'ontogénie des Oribates (Acari: Oribatei). *Revue Roumaine de Biologie, série de Biologie animale*, 24 (2): 107-112.

Vasiliu N., Călugăr M. 1980. L'effet de la fertilisation chimique d'une prairie naturelle sur les populations d'Oribates (Acarina: Oribatei). *Revue Roumaine de Biologie, série de Biologie animale*, 25 (2): 181-187.

Vasiliu N., Călugăr M., Clocotici V. 1980. Influence de la fertilisation chimique sur la communauté des Oribates (Acari: Cryptostigmata). *Travaux du Muséum national d'Histoire naturelle "Grigore Antipa"*, 22: 285-292.

Călugăr M., Vasiliu N. 1980. Community structure and species diversity of oribatid mites (Acarina: Oribatei) from "Codrul Secular Slătioara - Rarău" Nature Reserve (note I). Anuarul Muzeului Județean, Suceava, Nature Sciences, 6: 265-282 (in Romanian).
Călugăr M., Vasiliu N., Bulimar F., Huțu M. 1980. Effects of nitrogen fertilization on the biocoenotic structure in a meadow with *Agrostis tenuis* and *Festuca rubra* from Suceava Plateau (Oribatida and Collembola). Lucrări științifice, Research station for grassland culture, Brașov, 6: 121-124 (in Romanian).

Vasiliu N., Călugăr M., Huțu M. 1980. Obituary Zicman Feider (1903-1979). Travaux du Muséum national d'Histoire naturelle "Grigore Antipa", 22: 385-386.

Vasiliu N., Călugăr M. 1981. Nouvelles espèces d'Oribatei (Acarina: Oribatei). Revue Roumaine de Biologie, série de Biologie animale, 26 (2): 19-25.

Călugăr M., Vasiliu N. 1981. Nouvelles espèces d'Oribates (Acarina: Oribatei). Revue Roumaine de Biologie, série de Biologie animale, 26 (2): 121-126.

Călugăr M., Vasiliu N. 1981. Recherches sur la faune des Oribates (Acarina, Oribatei) de la zone inondée par la lac du barrage - réservoir Stânca - Costești situé sur la rivière Prut (Roumanie). Travaux du Muséum national d'Histoire naturelle "Grigore Antipa", 23: 19-27.

Călugăr M., Vasiliu N. 1983. Une nouvelle contribution à la connaissance de la faune d'Oribates (Acarina: Oribatei) du Karst de Cuba. In: Orghidan T. et al. (Eds.). Résultats des expéditions biospéologiques Cubano - Roumaines à Cuba, volume 4. Bucharest: Romanian Academy Press. p. 115-165.

Călugăr M., Vasiliu N. 1983. Research on populations of oribatid mites (Acarina: Oribatei) from forest zone Slătioara - Rarău (note II). Anuarul Muzeului Județean, Suceava, Nature Sciences, 7: 243-274 (in Romanian).

Călugăr M., Bulimar F., Vasiliu N., Huțu M. 1983. Effect of chemical pollution on populations of oribatid mites (Acarina) and collembolans (Insecta). Studii și cercetări de Biologie, Animal biology series, 35 (2): 136-147 (in Romanian).

Călugăr M., Vasiliu N. 1984. Au sujet de genre *Mongaillardia* Grandjean, 1961 (Acarina: Oribatei). Acarologia, 25 (1): 81-93.

Vasiliu N., Călugăr M. 1985. Ecological investigation on oribatid mites (Acarina: Oribatei) from the high area of the Călimani Massif. Anuarul Muzeului Județean, Suceava, Nature Sciences, 8: 107-122 (in Romanian).

Călugăr M., Vasiliu N. 1985. Synecological research on oribatid mites (Acarina: Oribatei) from Dealul Mare - Hârlău zone. Anuarul Muzeului Județean, Suceava, Nature Sciences, 8: 123-137 (in Romanian).

Călugăr M., Vasiliu N. 1986. Études écologiques sur les Oribates (Acarina: Oribatei) d'un pâturage de *Lolium perenne* et *Poa bulbosa*. Revue Roumaine de Biologie, série de Biologie animale, 31 (1): 33-40.

Călugăr M., Bulimar F., Huțu M., Vasiliu N. 1987. Ecological research on soil microarthropods in agroecosystems. Studii și cercetări de Biologie, Animal biology series, 39 (2): 143-153 (in Romanian).

Vasiliu N., Călugăr M. 1987. Coenological study on sapro-corticolous and sapro-lignicolous oribatid mites (Acarina: Oribatei) from the high limit forest of the Călimani Massif. Anuarul Muzeului Județean, Suceava, Nature Sciences, 9: 93-102 (in Romanian).

Vasiliu N., Vasiliu M. 1987. Coenological studies on oribatid mites (Acarina: Oribatei) from sub-alpine and alpine zone of the Rarău - Giumalău Mountains. Anuarul Muzeului Județean, Suceava, Nature Sciences, 9: 103-114 (in Romanian).

Vasiliu N., Vasiliu M. 1989. Structural peculiarities of oribatid mite community (Acarina: Oribatida) in a forest ecosystem with *Castanea sativa*. Anuarul Muzeului Județean, Suceava, Nature Sciences, 10: 15-21 (in Romanian).

Vasiliu N., Vasiliu M. 1989. Coenological analysis of oribatid mite community (Acarina: Oribatida) in the biotopes of spruce forest from the Giumalău Massif. Anuarul Muzeului Județean, Suceava, Nature Sciences, 10: 55-65 (in Romanian).

Vasiliu N., Vasiliu M. 1989. Structural peculiarities of oribatid mite communities (Acarina: Oribatida) in the litter of high-altitude forests from the Retezat Massif. Anuarul Muzeului Județean, Suceava, Nature Sciences, 10: 67-77 (in Romanian).

Vasiliu N., Mihăilescu A. 1989. Oribatid mites (Acarina: Oribatei), bioindicators of forest soil pollution with heavy metals, sulphur dioxide and carbon black. Analele Institutului pentru Pedologie și Agrochimie, București, 50: 287-301 (in Romanian).

Vasiliu N., Vasiliu M. 1991. Structural peculiarities of oribatid mite communities (Acarina: Oribatei) from the Retezat Massif (Small Retezat). Anuarul Muzeului Bucovinei, Suceava, Nature Sciences, 11: 69-78 (in Romanian).

Vasiliu N., Vasiliu M. 1991. Fauna and coenology of oribatid mite communities (Acarina: Oribatei) in meadows from the Călimani Massif. Anuarul Muzeului Bucovinei, Suceava, Nature Sciences, 11: 79-93 (in Romanian).

Vasiliu N. 1992. Biocoenotic structure of oribatid mites communities (Acarina: Oribatida) from Retezat Massif. In: Popovici I. (Ed.). Retezat National Park – ecological studies. Brașov: West Side Computers Press. p. 228-237 (in Romanian).

Vasiliu N., Ivan O. 1992. Fauna and coenology of the oribatid mites communities (Acari, Oribatei) from sandy and paludous habitats of the Danube Delta. Scientific Annals of the Danube Delta Institute, Tulcea, 1: 67-74 (in Romanian).

Vasiliu N., Ivan O. 1993. Structural peculiarities of the oribatid mites communities (Acarina: Oribatida) from *Phragmites australis* biocoenoses in the Danube Delta. Scientific Annals of the Danube Delta Institute, Tulcea, 2: 213-216 (in Romanian).

Vasiliu N., Ivan O., Vasiliu M. 1993. Faunistic synopsis of the oribatid mites (Acarina, Oribatida) from Romania. Anuarul Muzeului Național al Bucovinei, Suceava, Nature Sciences, 12: 3-82 (in Romanian).
Vasiliu N., Ivan O., Fabian L. 1994. The fauna and coenology of Oribatid mites (Acarina, Oribatida) from some xerophylic habitats in the Danube Delta Biosphere Reserve. Scientific Annals of the Danube Delta Institute, Tulcea, 3: 33-39.

Vasiliu N., Tălmaciu M., Georgescu T. 1994. Fauna of corticolous mites in vineyards from Copou - Iași. Lucrări științifice, Horticulture series, Iași, 37: 173-177 (in Romanian).

Fabian L., Vasiliu N., Ivan O. 1994. Structure of the oribatid mites communities in three beech forests from Apuseni Mountains. Scientific Annals, University of Oradea, Biology, 1: 37-43 (in Romanian).

Ivan O., Vasiliu N. 1994 - The fauna and coenology of Oribatids (Acari, Oribatida) in the forest of Letea - the Danube Delta. Scientific Annals of the Danube Delta Institute, Tulcea, 3: 95-100.

Vasiliu N., Ivan O. 1995. Oribatid mites from Israel. In: Nitzu E. (Ed.). Soil Fauna of Israel. Bucharest: Romanian Academy Press. p. 69-86.

Vasiliu N., Ivan O. 1995. L'effet des poudres de ciment sur les communatés d'Oribates de l'horizon organique des sols forestiers. Anuarul Muzeului Național al Bucovinei, Suceava, Nature Sciences, 13: 33-43.

Vasiliu N., Ivan O., 1995 - Oribatid mites (Acarina, Oribatida), bioindicators of agricultural soil pollution. In: Ciochia V. (Ed.). Proceedings of 2nd National Conference for Environment Protection, Brașov, 1992; Brașov: Transilvania University Press. p. 370-376 (in Romanian).

Vasiliu N., Ivan O. 1995. Structural peculiarities of the Oribatid (Acari, Oribatida) communities in the Danube Delta's anthropic ecosystems. Scientific Annals of the Danube Delta Institute, Tulcea, 4(2): 267-273.

Vasiliu N., Ivan O., Dumitru M. 1995. Edaphic arthropods as bioindicators of agricultural soil pollution with heavy metals and fluorine. Soil Science, 29 (2): 81-90.

Vasiliu N., Ivan O., Vasiliu M. 1995. La faune et la cénologie des communautés d'Oribates (Acari, Oribatida) des forêts d'épicea des Monts Călimani (Carpathes Orientaux-Roumanie). Anuarul Muzeului Național al Bucovinei, Suceava, Nature Sciences, 13: 5-32.

Vasiliu N., Ivan O. 1997. Effect of the draining and upturning measures on the oribatid community from the lawn ecosystem of the Prut water meadow. Studii și Cercetări științifice, Biology series, University of Bacău, 2: 163-172.

Ivan O., Vasiliu N. 1997. New species of the family Oppiidae Grandjean, 1954 (Acari, Oribatida). Travaux du Muséum national d'Histoire naturelle "Grigore Antipa", 39: 7-29.

Ivan O., Vasiliu N., Vasiliu M. 1997 - The fauna and structure of the oribatid mites communities from height peat bogs in the Eastern Carpathians (Romania). Poiana Stampei and Lucina nature reserves. Anuarul Muzeului Național al Bucovinei, Suceava, Nature Sciences, 14: 35-42.

Vasiliu N., Andor I., Filipescu C. 1998. Morpho-biometric data of the adult population of *Tetranychus urticae* Koch, 1836 from greenhouses at Iași. Lucrări științifice, Horticulture series, Iași, 41: 369-374 (in Romanian).

Vasiliu N., Andor I., Filipescu C. 1998. Considerations on structure of population of *Tetranychus urticae* Koch, 1836 from greenhouses at Iași. Lucrări științifice, Horticulture series, Iași, 41: 375-378 (in Romanian).

Vasiliu N., Ivan O. 1999. New species of the genus *Lauroppia* Subias et Rodriguez, 1986 (Acari, Oribatida, Oppiidae). Travaux du Muséum national d'Histoire naturelle "Grigore Antipa", 41: 133-153.

Ivan O., Vasiliu N. 1999. New species of the subfamily Multioppiinae Balogh, 1983 (Acari, Oribatida, Oppiidae). Travaux du Muséum national d'Histoire naturelle "Grigore Antipa", 41: 109-131.

Vasiliu, N., Ivan, O., 2000. *Kulievia* a new genus of oribatid mites (Acari, Oribatida, Oppiidae). Anuarul Muzeului Național al Bucovinei, Suceava, Nature Sciences, 15: 117-124.

Vasiliu N., Ivan O., Lungu M., Ștefănescu S. L. 2000 - Quantitative and qualitative state of the communities of edaphic mesofauna from the soils of the Cincșor ecologic farm, Brașov county - phase I, 1997. In: Dumitru M., Ștefănescu S.L., Simion Paranici S., Lungu M. (Eds.). Strategy to sustainable agriculture in Romanian Danube basin: an organic vs. conventional agriculture approach. Cluj Napoca: Triade Press. p. 137-142.

Vasiliu N., Ivan O., Călugăr A., Popa R., Lungu M. 2000. Comparative analysis of the communities of micro-arthropods from Cincșor, Brașov county, ecological farm soils. In: Dumitru M., Ștefănescu S.L., Simion Paranici S., Lungu M. (Eds.). Strategy to sustainable agriculture in Romanian Danube basin: an organic vs. conventional agriculture approach. Cluj Napoca: Triade Press. p. 143 - 155.

Iacob O., Vasiliu N. 2000. *Zygoribatula connexa* (Berlese, 1904) - intermediate host in transmission of cestodes in sheep. Cercetări agronomice în Moldova, Iași, 33 (1-2): 133-137 (in Romanian).

Ivan O., Vasiliu M., Vasiliu N. 2004. The oribatid fauna (Acari: Oribatida) in some saxicolous habitats from high altitude in Eastern Carpathians (Romania). Anuarul Muzeului Național al Bucovinei, Suceava, Nature Sciences, 16-17: 109-126.

Călugăr A., Ivan O., Vasiliu N., Vasiliu M. 2006. Diversity and distribution of the oribatid and gamasid (Acari: Oribatida, Gamasina) fauna in forest ecosystems of Siret meadow. Anuarul Muzeului Național al Bucovinei, Suceava, Nature Sciences, 18-19: 157-173.

Ivan O., Călugăr A., Andor I., Vasiliu N. 2006. Qualitative analysis of mites fauna and dynamics of the pest *Colomerus vitis* (Pagenst., 1857) in vineyards from Cotnari. Lucrări științifice, Horticulture series, Iași, 49: 1109-1115 (in Romanian).

Ivan O., Călugăr A., Vasiliu N. 2006. A survey of the edaphic mites fauna (Acari: Oribatida, Gamasina) from the main types of forest ecosystems in the Danube Delta Biosphere Reserve. Scientific Annals of the Danube Delta Institute, Tulcea, 12: 45-54.

Ivan O., Vasiliu N. 2006. Diversity and distribution of the oribatid mites (Acari, Oribatida) in the forest ecosystems from the middle section of the Prut riverside. Scientific Annals of the Danube Delta Institute, Tulcea, 12: 55-64.
Vasiliu N. A., Călugăr M., Ivan O. 2008. Fauna and coenology of oribatid mites (Acari: Oribatida). In: Chifu T., Manoliu Al., Toma C. (Eds.). Călimani National Park – ecological and biodiversity studies. Cluj-Napoca: Alma Mater Press. p. 248-281 (in Romanian).

Ivan O., Vasiliu N. A. 2008. The family Scheloribatidae Grandjean, 1933 in Romanian fauna. In: Bertrand M., Kreiter S., McCoy K. D., Migeon A., Navajas M., Tixier M.-S., Vial L. (Eds.). Integrative Acarology; Montpellier: Proceedings of 6th Congress of EURAAC. p. 175-182.

Ivan O., Vasiliu N. A. 2009. Oribatid mites (Acari, Oribatida) – bioindicators of forest soils pollution with heavy metals and fluorine. Annals of Forest Research, 52: 11-18.

Vasiliu N. A., Ivan O. 2009. Considerations on the genus Multioppia Hammer, 1961. New species of the genus from Romania. Acarologia, 49 (1-2): 39-53.

Vasiliu N., Ivan O. 2010. Acarina order. In: Godeanu S.P. (Ed.). Diversity of the living World, III – Terrestrial environment, part 2. Arad: “Vasile Goldiş” University Press. p. 561-584 (in Romanian).

Ivan O., Vasiliu N. A. 2010. Influence of the pollution with cement dust on the oribatid communities (Acari, Oribatida) in forest soils from Câmpulung Muscel zone (Romania). Lucrări ştiinţifice, Agronomy series, Iaşi, 53 (3): 186-192.

Ivan O., Vasiliu N. A. 2010 - Fauna of oribatid mites (Acari, Oribatida) from the Movile Cave area (Dobrogea, Romania). Travaux de l'Institut de Spéologie "Émile Racovitza", 49: 29-40.

Vasiliu N. A., Ivan O. 2011 - New oppiid species (Acari, Oribatida, Oppiidae) from Romanian caves, Travaux de l'Institut de Spéologie "Émile Racovitza", 50: 3-14.