Elena Ivanova

• Severtsov Institute of Ecology and Evolution

A member of the genus Pellioditis Dougherty, 1953 (syn. Phasmarhabditis Andrássy, 1976) was detected in three introduced gastropod species in Moscow for the first time. Both the nematode and its gastropod hosts were found to have originated from the Caucasus region. No native gastropod species as well as the alien invasive slug Arion vulgaris were...

Caucasus is known as one of the few biodiversity hotspots in Europe and is characterised by rich gastropod fauna while the nematode fauna in association with gastropods has remained largely understudied. Surveys conducted in 2019 and 2021 in the North Caucasus of the Russian Federation (Stavropol Upland and western and central parts of Krasnodar Kr...

A new nematode species, Phasmarhabditis villasmundi sp. n., was isolated from land gastropods in the Villasmundo-S. Alfio Nature Reserve in Syracuse Province, Sicily. Phasmarhabditis villasmundi sp. n. is characterised by the presence of males and females in the population and is recognised mainly by a conical female tail with prominent phasmids at...

Purpose: The present study investigates the origin of Arion vulgaris slugs in the parks of Moscow city and their parasites. Methods: Snails and slugs inhabiting green areas of Moscow city were collected in the summer season of 2020 and examined on the presence of gastropod-associated nematodes and trematodes using morphological and molecular met...

Synoecnema hirsutum Timm, 1959 (Ungellidae, Drilonematoidea), found in the body cavity of the pheretimoid earthworm at the border of Laos and Vietnam, was re-described and illustrated. The mitochondrial genome of S. hirsutum obtained with Illumina HiSeq sequencing is the first annotated mitochondrial genome as a representative of the superfamily Dr...

Phasmarhabditis quinamensis sp. n. was recovered from several tropical terrestrial gastropod species collected in Cat Tien National Park in southern Vietnam with the snail, Sesara sp., designated as the type host. Phasmarhabditis quinamensis sp. n. is recognised by males and females with a lip region set off by the circle of six triangular low prob...

Synoecnemahirsutum Timm, 1959 (Ungellidae, Drilonematoidea) found in the body cavity of the pheretimoid earthworm at the border of Laos and Vietnam was redescribed and illustrated. It was molecularly characterised for the first time. It is also the first member of the superfamily Drilonematoidea for whom the mitochondrial genome was obtained.

Spermatogenesis of five rhabditid nematodes was studied using transmission electron microscopy and is described herein. Structure and development of nematode sperm in all available representatives of the extensive order Rhabditida have been analysed and the main characteristics of each infraorder are discussed. The ancestral sperm of the order Rhab...

Two new nematode species of Phasmarhabditis were isolated from land snails in North and West Caucasus, Russian Federation. Phasmarhabditis circassica sp. n. originated from Oxychilus sp. collected by the Nickel settlement in the Adygea Republic while P. clausiliiae sp. n. came from Clausiliidae gen. sp. in the Stavropol district. Phasmarhabditis ci...

The supralittoral amphipod Traskorchestia ditmari (Derzhavin, 1923) was identified as the intermediate host for Antechiniella septentrionalis Ivanova, Dokuchaev & Spiridonov, 2019, a parasite of the tundra vole Microtus oeconomus and Skrjabinocerca sp. (both Spirurida: Acuariidae) in Magadan Oblast in north-eastern Russia. Joint infection by both l...

A short survey on the parasite fauna of terrestrial molluscs in south-east of Sicily was performed. In total, 432 specimens of 12 different snail species from the families Cochlostomatidae, Clausiliidae, Subulinidae, and Helicidae and five slug species from the families Agriolimacidae, Limacidae and Milacidae were collected and examined. Seven out...

During a survey for mollusc-associated nematodes in South Africa, a new Phasmarhabditis species was isolated from the invasive slug, Deroceras reticulatum, collected from a nursery near George in the Western Cape province. The nematode was identified using a combination of morphological, morphometric, molecular, and phylogenetic techniques. The new...

Antechiniella septentrionalis n. sp. (Spirurida: Acuariidae) is described from the duodenum of a tundra vole, Microtus oeconomus (Pallas), collected in the Magadan region in the north-east part of Russia. It differs from A. suffodiax (Beveridge & Barker, 1975) and A. sertatum Smales, 1991 mainly in having a larger number of postcloacal papillae (5–...

A new nematode species recovered from the laboratory culture of Drosophila melanogaster is described and illustrated. The mass reproduction of Panagrellus levitatus sp. n. in the fly culture occurred several times and resulted in a significant reduction of the fly population. Nematode outbreaks happened after the introduction of D. melanogaster to...

Angiostoma norvegicum n. sp. (Angiostomatidae) is described from the oesophagus, crop and the buccal mass of five species of slugs of the family Arionidae, Arion vulgaris (Moquin-Tandon), Arion ater (L.), Arion fasciatus (Nilsson), Arion fuscus (Müller) and Arion rufus/Arion ater hybrid), collected throughout Norway. Angiostoma norvegicum n. sp. wa...

Redescription of Steinernema (Neoaplectana) thesami Gorgadze, 1988 was done based on the nematode strain isolated in Georgia in 1987 from an infected lepidopteran, Operophtera brumata, and since then maintained under laboratory conditions. Molecular analysis has shown the similarity of the ITS rDNA sequence of S. thesami with that of recently descr...

A new species, Araguanema mutabile sp. nov., from tiie coelomic cavity of a glossoscolecid earthworm Aptodrilus fuhrmanni Michaelsen, 1918 deposited in the collection of Natural History Museum of Geneva, is described and illustrated. The new species is characterised by the presence of two types of somatic sensory organs, i.e. vesicular and fimbriat...

A new nematode genus and species associated with terrestrial gastropods from Vietnam is described and illustrated. Partial SSU and ITS rDNA sequences were obtained and subjected to phylogenetic analysis. Both morphologically and molecularly, Neoalloionema tricaudatum gen. n., sp. n. is closest to Alloionema appendiculatum, another gastropod associa...

Three new species of Filiponema, Filiponemasp., and a new species of Iponemaare described from earthworms. Filiponema champasp. n., from the coelomic cavity of Pheretimasp. from Vietnam, is closest to F. cylindropharyngatumand F. javanicumbut differs in having a wider body, longer spicules and more conspicuous excretory pore. Filiponema yaoensesp....

A survey of nematodes associated with terrestrial slugs was conducted for the first time in Norway. A total of 611 terrestrial slugs were collected from 32 sample sites. Slugs were identified by means of morphological examination, dissection of genitalia and molecular analysis using mitochondrial DNA. Twelve slug species were identified, representi...

A new species of the genus Synoecnema-S. watinagii sp. n.-is described and illustrated. The species is characterized by its small size, lack of sexual dimorphism apart from sexual characters, males with pericloacal disk, females with anterior vulva position and lacking an anus, and similar caudal organs in both sexes in the shape of long, deep slit...

It is generally accepted that climate change is likely to disrupt host-parasite relationships, but little consideration has been given to how this may affect agricultural pests. Here, we study the potential influence of climate change on the pest slug Deroceras reticulatum and its nematode parasite Phasmarhabditis hermaphrodita. The European slug D...

ON THE DIVERSITY OF NEMATODES PARASITIC IN INVERTEBRATES OF MINDANAO ISLAND, PHILIPPINES. Ivanova1, E.S., N.H.N. Sumaya2, A.B. Mohagan3 and S.E. Spiridonov1.1A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr., 33, Moscow, 119071, Russia; 2Biology Department, Mindanao State University-Iligan Institute of te...

Drasico n. g. is erected to accommodate two new species of nematode, Drasico nemoralis n. sp. and D. paludigenus n. sp., recovered from coelomic cavities of Drawida ghilarovi Gates, endemic earthworms of the Russian Far East. The new genus is characterised by the following unique for the Synoecneminae characters: apical portion of the head attenuat...

An isolate of Steinernema cameroonense Ngo Kanga et al., 2012, which differs from type one in 2 bp of the ITS rDNA region, has been cultured on Galleria mellonella since 2011. The body length and pharynx length of the infective juveniles of this isolate differ from those reported for the type isolate (ranges do not overlap). The taxonomically impor...

A new isolate of Steinernema costaricense Uribe-Lorío, Mora & Stock, 2007 (Panagrolaimorpha: Steinernematidae) was discovered from the Bush Augusta State Park, Missouri, USA, and its morphological and molecular examination was carried out. Morphologically, adults of the Missouri isolate are very close to S. costaricense from Costa Rica. Infective j...

Short surveys on the nematode fauna of terrestrial molluscs in Sofia, Bulgaria and Crimea, Ukraine were performed. The composition of nematode fauna was compared with data from the literature and in our records of nematode fauna from different regions of continental Europe and the British isles. Two nematode species, Angiostoma dentiferum Mengert,...

A new Alaninema species associated with leaf-veined slugs (Athoracophoridae) in New Zealand is described and illustrated. Alaninema ngata n. sp. is characterised by a very long, cylindrical body, rounded head bearing two circles of cephalic papillae and amphids, shallow stoma with three bifid teeth, muscular, cylindroid pharynx lacking valves, enla...

Two new species of Siconema (Drilonematoidea: Ungellidae) from Pu Mat Nature Reserve, Vietnam are described and illustrated. Siconema ovicallosum sp. n. is characterised by a wide female body, female caudal organs displaced to posterior extremity followed by short tail tip; males short, slim with caudal organs near cloacal opening and long, conical...

A new genus and six new species of nematodes (Ungellidae, Drilonematoidea) parasitic in earthworms deposited in the Muséum National d’Histoire Naturelle, Paris, are described. Except for Ungella haitiana sp. n., all nematodes were found in West African oligochaetes. Chabaudigella perforata gen. n., sp. n. is distinguished by having a single row of...

The Iponematinae is revised based on the morphological analysis of known and newly described species. Globocephalonema is restored to accommodate three former Iponema species: G. krishnanii, G. hyderabadense and G. timmae. Emended generic diagnoses and keys for species identification are proposed. Three new species, Filiponema javanicum sp. n., F....

A survey of nematodes associated with native and introduced species of terrestrial slugs was conducted in the Western Cape Province of South Africa, in order to gather new data regarding diversity and distribution. A total of 521 terrestrial slugs were collected from 35 localities throughout the Western Cape. All slugs were dissected and examined f...

Angiostoma margaretae n. sp. (Angiostomatidae) is described from the oesophagus of the slug Milax gagates Draparnaud collected near Caledon in the Western Cape Province of South Africa. The new species closely resembles another parasite of a milacid slug, A. milacis Ivanova & Wilson, 2009, with a similar head, stoma and spicule shape, the presence...

Two new species of the rare nematode family Creagrocercidae from earthworms are described and illustrated. Creagrocercus braziliensis n. sp. is distinguished from the type-species, C. barbatus Baylis, 1943, by: the presence of four cephalic papillae (vs a pair of finger-shaped latero-ventral processes) on the head; larger amphids; a more posterior...

Several species of European slugs are invasive in the USA, threatening native species and damaging agricultural and horticultural crops. One possible explanation for the success of these invaders is parasite release. To test this hypothesis we collected European slugs in part of their native range (United Kingdom) and in the USA and compared preval...

A new genus and three new species of Drilonematidae (Rhabditidae, Drilonematoidea) from earthworms deposited in the collection of Natural History Museum, Smithsonian Institution are described and illustrated. Paradicelis bursata gen. et sp. n. is closely related to other Dicelinae genera, namely Dicelis Dujardin, 1845 and Adieronema Timm 1966, but...

A new genus and three new species of Drilonematidae (Rhabditidae, Drilonematoidea) from earthworms deposited in the collection of Natural History Museum, Smithsonian Institution are described and illustrated. Paradicelis bursata gen. et sp. n. is closely related to other Dicelinae genera, namely Dicelis Dujardin, 1845 and Adieronema Timm 1966, but...

The nematode Angiostoma glandicola sp. n. found parasitizing Megaustenia sp. snails (Pulmonata: Helicarionidae) collected in Dong Nai Province, Vietnam, is described and illustrated. The new species is characterized by its unusual host location (the digestive gland) and in having: two circles of cephalic probolae, six lips each bearing two prominen...

Two new species of Angiostoma Dujardin, 1845 taken from the intestines of terrestrial molluscs (Gastropoda: Stylommatophora) collected in the UK are described and illustrated. Angiostoma milacis n. sp. is parasitic in milacid and agriolimacid slugs and is closely related to A. asamati Spiridonov, 1985. Angiostoma zonitidis n. sp. was found in a zon...

A new species and genus of nematodes (Ungellidae, Drilonematoidea) parasitic in the coelomic cavity of Notiodrilus bovei deposited in the collection of the Museum für Naturkunde in Berlin, is described and illustrated. Malvinia crassa gen. n., sp. n. is characterised by its short, bloated, curved body tapering to both ends, paired, superficially at...

A new nematode genus and a new nematode species parasitizing in the earthworm, Amynthas robustus, from the mountain ridge Tao Dao, Vin Fu province, Vietnam are described. Unicorninema montanum gen. et sp. n. is characterized by a single cephalic hook, an excretory pore at the level of the pharynx base, a lack of buccal cavity, amphids and cephalic...

Over the last century, only two cases of ocular oxyspirurosis were recorded in primates, both in zoos, and two species were described: in Berlin, Germany, Oxyspirura (O.) conjunctivalis from the lemurid Microcebus murinus, later also found in the lorisid Loris gracilis; in Jacksonville, Florida, O. (O.) youngi from the cercopithecid monkey Erythroc...

Two new species of the families Ungellidae and Homungellidae (Drilonematoidea) are described from the coelomic cavity of Vietnamese earthworms. Siconema ovispicatum sp. n. (from Amynthas mbustus (Perrier, 1872) collected in Cue Phuong Natural Park) is characterized by fused cephalic hooks, egg-shells covered with widely set acute pyramid-shaped spi...

Two new genera and two new species of nematodes (Ungellidae, Drilonematoidea) parasitic in Neotropic acanthodrilids from the collection of the Natural History Museum of Geneva, Switzerland, are described. Yagansiella longicollis gen. n., sp. n. and Ungella chileana sp. n. are parasitic in Yagansia spatulifera, whereas Ungella micronychium sp. n. in...

In order to study the phylogenetics and morphology of the genus Dicelis, we collected infected lumbricid hosts from geographically remote areas. Four species of Dicelis were found: D. rubidi, D. lovatiana and two new species, D. caledoniensis and D. ussuriensis sp. n. described herein. Dicelis caledoniensis sp. n. is characterised by having pocket-...

Entomopathogenic nematodes are widely used as biological insecticides for agricultural and horticultural pests. In the vast majority of cases, commercial products contain nematodes partially dehydrated on to inert solid carriers. Nematode survival in these products is generally poor, they are difficult to handle and are not suitable for use with al...

Two new genera of Drilonematoidea from earthworms deposited in the collection of the Smithsonian Institution's Natural History Museum are described. Acanthungella africana gen. n., sp. n. (Ungellidae) was found parasitic in the coelomic cavity of Millsonia nigra Beddard, 1894 and Araguanema venezuelae gen. n., sp. n. (Drilonematidae) was found in t...

Two new species of Ungella Cobb, 1928 are described from earthworms deposited in the collection of the Smithsonian Institution Natural History Museum. Ungella burmensis sp. n. is distinguished from U. secta Cobb, 1928 by having finely mammilated egg shells, smaller gubernaculum and more numerous pre-cloacal papillae. Ungella mexicana sp. n. differs...

Filiponema baviense sp. n. is described from specimens recovered from the coelomic cavity of megascolecid earthworms collected at the altitude of 1100 m on Ba Vi mountain, Vietnam. F. baviense sp. n. is distinguished from congeners by its bifurcated spicular distal end and by the size and structure of its receptaculum seminis. Fibrous filling prese...

Dicelis keymeri sp. n. from the coelomic cavity of the lumbricid Octolasium pseudotranspadanum Zicsi, 1971, collected in Hungary is described. The new species is distinguished from the five other members of the genus by arrangement of male papillae, size of eggs, or shape of oral aperture.

Dicelis keymeri sp. n. from the coelomic cavity of the lumbricid Octolasium pseudotranspadanum Zicsi, 1971, collected in Hungary is described. The new species is distinguished from the five other members of the genus by arrangement of male papillae, size of eggs, or shape of oral aperture.

Steinernema bicornutum (Nematoda, Rhabditida, Steinernematidae) íà Ñåâåðíîì Êàâêàçå. Èâàíîâà Å. Ñ., Ñïèðèäîíîâ Ñ. Ý. — Íåìàòîäû Steinernema bicornutum Tallosi, Peters & Ehlers, 1995 áûëè âûäåëåíû, ñ èñïîëüçîâàíèåì ãóñåíèö Galleria mellonella â êà÷åñòâå ïðèìàíîê, èç îáðàçöîâ ïî÷âû, ñîáðàííûõ îêîëî Êðàñíîäàðà (Ñåâåðíûé Êàâêàç). Îáíàðóaeåíû ðàçëè÷èÿ ì...