Sergey G. Ermilov

60350642600

Publications - 6

Description of an arboreal oribatid mite species of the genus Ovobates (Acari, Oribatida, Oribatulidae), based on adult and nymphs from Vietnam

Jenő Kontschán Sergey G. Ermilov

Publication Name: Zootaxa

Publication Date: 2026-01-14

Volume: 5748

Issue: 3

Page Range: 112-124

Description:

The genus Ovobates (Oribatida, Oribatulidae) comprises two species distributed in the Oriental region. A new species— Ovobates ochrocarpicus sp. nov.—is described, based on adult and nymphal instars, collected from branches of the ochrocarp tree in southern Vietnam. The adult of the new species is characterized by the presence of the five pairs of notogastral porose areas and the epimeral formula 3-1-3-3. The nymphs of the new species are characterized by presence of clavate bothridial seta; setiform interlamellar seta; short, setiform, thin gastronotic setae c1, c2, da, la; medium-sized to long, setiform, gastronotic setae dm c3, lm, p2, and p3; medium-sized, bacilliform gastronotic setae dp, h1, and h3; long, subflagellate, gastronotic setae lp, h2, and p1; epimeral formula 3-1-2-2 in tritonymph; and seven setae on the leg tarsus IV in protonymph. The generic diagnosis and a morphological comparison of adults and juvenile instars of the known species of Ovobates are presented.

Open Access: Yes

DOI: 10.11646/zootaxa.5748.3.1

A new sexually dimorphic species of Pirnodus (Acari, Oribatida, Oripodidae) associated with trees in southern Vietnam

Jenő Kontschán V. M. Salavatulin Sergey G. Ermilov

Publication Name: Persian Journal of Acarology

Publication Date: 2026-01-01

Volume: 15

Issue: 1

Page Range: Unknown

Description:

Pirnodus (Oribatida, Oripodidae) currently comprises seven species, collectively distributed in the tropical and southern Palaearctic areas. A new arboreal species – P. arboreus sp. nov. – is described, based on adults collected from branches of different trees in the Cat Tien National Park, southern Vietnam. The new species is characterized by distinct sexual dimorphism, e.g., interlamellar seta long, setiform in females versus medium-sized, phylliform in males, posterior part of notogaster not depressed in females versus depressed in males, notogastral seta h1 well developed, setiform in females versus vestigial in males, notogastral seta lm located medial to la in females versus anteromedial in males, genital and anal apertures distanced from each other in females versus genital aperture shifted to anal aperture and connected to it in males, and dorsal side of tarsi I and II without tooth in females versus with tooth in males. Summary of distribution and habitats of the known species of Pirnodus are provided.

Open Access: Yes

DOI: 10.22073/pja.v15i1.87782

Three new Hutufeideria Hirschmann & Hiramatsu, 1977 from Southeast Asia, with the description of Hutufeideriidae fam. nov. (Acari, Mesostigmata)

Jenő Kontschán Rita Ábrahám Sergey G. Ermilov

Publication Name: Zookeys

Publication Date: 2026-01-01

Volume: Unknown

Issue: 1280

Page Range: 63-81

Description:

Three new species of the genus Hutufeideria are described from the Oriental region. The first species, H. perakensis sp. nov., was collected in Malaysia and differs from its congeners in the presence of a strongly sclerotized furrow on the dorsal shield and very long setae on the central area of the dorsal shield. The second species, H. sarawakensis sp. nov., was found in Sarawak (Malaysia) and differs from other species of the genus in the shape of the setae on the caudal part of the dorsal shield and the shape of the female genital shield. The third species, H. sumatraensis sp. nov., was collected from Sumatra (Indonesia) and has a tile-like sculptural pattern on the ventral shield; the dorsal shield is covered with large and irregular pits, and bears serrate setae on the caudal margins of the dorsal shield; these represent a unique character combination within the genus. Hutufeideriidae fam. nov. is diagnosed, with Hutufeideria as the type genus. A list of known species is provided.

Open Access: Yes

DOI: 10.3897/zookeys.1280.188887

Two new species from the genus Phymatodiscus Berlese, 1917 from Brunei (Acari: Mesostigmata: Phymatodiscidae)

Jenő Kontschán Sergey G. Ermilov

Publication Name: Acarologia

Publication Date: 2026-01-01

Volume: 66

Issue: 2

Page Range: 511-520

Description:

Two new species were collected from the family Phymatodiscidae Kontschán and Ermilov, 2023 during the study of the soil-dwelling Uropodina from Brunei Darussalam. Phymatodiscus bruneiensis n. sp. has very unusual characters (such as marginal prolongations situated only on the caudal area) that are visible only in the Japanese P. iriomotensis Hiramatsu, 1979, but the shape and positions of the dorsal, ventral and sternal setae differ between those two species. The second species, P. hiramatsui n. sp., lacks marginal prolongations; this character state is observable only in P. polyglottis Hirschmann, 1977 (New Guinea), but the known species differ from it in the shape of the elevated parts of the dorsal shield, the sculptural pattern and the dorsal setation.

Open Access: Yes

DOI: 10.24349/0jfk-n2ho

Contribution to knowledge of the genus Gibbauropoda Hirschmann, 1979 (Acari: Uropodidae) with the description of a new species from Vietnam

Jenő Kontschán Sergey G. Ermilov

Publication Name: Ecologica Montenegrina

Publication Date: 2026-05-03

Volume: 98

Issue: Unknown

Page Range: 240-248

Description:

A new species of Gibbauropoda (G. vietnamica sp. nov.) is discovered and described based on four females and one male from Vietnam. The new species differs from its congeners in having a triangular prolongation of the lateral depression on the dorsal shield, as well as in the setation and sculptural pattern of the dorsal and ventral idiosoma. An updated diagnosis of the genus, accompanied by a new list of known species, is given.

Open Access: Yes

DOI: 10.37828/em.2026.98.16

Trachycilliba dominicana n. sp., the first confirmed representative of genus Trachycilliba in the Neotropical realm (Acari: Mesostigmata: Uropodidae)

Jenő Kontschán Sergey G. Ermilov

Publication Name: Acarologia

Publication Date: 2026-01-01

Volume: 66

Issue: 2

Page Range: 579-587

Description:

The description of Trachycilliba dominicana n. sp. (Mesostigmata: Uropodina: Uropodidae) from the Dominican Republic is presented based on females, males and deutonymphs. This is the first conformed Neotropical species of the genus Trachycilliba. The new species has several unusual characteristics that were not observed in other species of this genus, such as a specific-shaped elevated central area on the dorsal shield and the absence of the eight post-dorsal platelets.

Open Access: Yes

DOI: 10.24349/8puf-bftw