Anna Zhadan

Anna Zhadan
Lomonosov Moscow State University | MSU · Faculty of Biology

PhD

About

53
Publications
10,668
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304
Citations
Additional affiliations
March 2006 - present
Lomonosov Moscow State University
Position
  • Senior Researcher

Publications

Publications (53)
Article
Full-text available
The first cave-dwelling Solenogastres—marine shell-less worm-like mollusks—were sampled from Mediterranean marine caves floor silt in the Marseille area. The mollusks were 1.5 mm in length, had a transparent body with shiny spicules and appear to represent a new Tegulaherpia species. Electron microscopy revealed a high number of microbial cells, lo...
Article
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Sedentarian annelids are a diverse and heterogeneous group of marine worms representing more than 8600 species gathered in ca. 43 families. The attention brought to these organisms is unevenly distributed among these families, and the knowledge about them sometimes scarce. We review here the current knowledge about the families Acrocirridae, Cirrat...
Article
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In Australia, the deep-water (bathyal and abyssal) benthic invertebrate fauna is poorly known in comparison with that of shallow (subtidal and shelf) habitats. Benthic fauna from the deep eastern Australian margin was sampled systematically for the first time during 2017 RV ‘Investigator’ voyage ‘Sampling the Abyss’. Box core, Brenke sledge, and be...
Article
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This review addresses the state of the art of the systematics and the improvements in the biology, ecology and species diversity of the two annelid taxa Parergodrilidae and Orbiniidae, the early branching group of Orbiniida sensu Struck et al., 2015 according to molecular studies. An effort to identify gaps of knowledge is given to understand the d...
Article
The present study is a review of all known Australian and New Zealand orbiniid species with their redescription based mainly on the collection of the Australian Museum (Sydney). A total of 28 species were examined: seven species of Scoloplos, three species of Leitoscoloplos, five species of Leodamas, three species of Naineris, two species of Orbini...
Article
A checklist of the polychaete fauna collected from the intertidal coastal zone along the northern part of the Arabian Gulf in Kuwait is presented. Samples were collected from 42 transects, including mainland areas and seven islands, during late autumn and winter seasons from 2013 to 2016. In total, 172 polychaete species from 46 families were ident...
Article
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Abyssal polychaetes are usually difficult to be identified because they are small, their body patterns differ from their shallow water relatives, their delicate bodies are often damaged during sampling and sieving, and their taxonomy is in need of revision. Members of the family Fauveliopsidae Hartman, 1971 are widespread in deep ocean basins and t...
Article
The anatomy of Cossura pygodactylata Jones, 1956 (Annelida; Cossuridae) is presented, based on the study of specimens collected during the BIOICE project in Icelandic waters and additional material from the White Sea. General gross external and internal anatomy were investigated by means of micro-computed tomography (micro-CT) and compared with res...
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In the present study, we investigated the biology of Dyopedos bispinis, a mast-building amphipod that is abundant near the N. Pertsov White Sea Biological Station. To examine the peculiarities of mast building in Dyopedos bispinis, we studied the social structure of individuals inhabiting the masts and identified the preferred substrata through und...
Article
Two new species of Cossura Webster & Benedict, 1887 were found in material collected during sampling from the terminal lobes of the Congo deep-sea fan. They were described using light and scanning electron microscopy. Cossura platypus sp. nov. has 15–17 thoracic chaetigers, a prostomium longer than it is wide, with a widely rounded anterior margin,...
Article
Five sternaspid species were found near Vietnam shores: Sternaspis britayevi sp. nov., S. costata von Marenzeller, 1879, S. nana sp. nov., S. papillosa sp. nov., and S. spinosa Sluiter 1882. Sternaspis britayevi is described from the shallow water in Vietnam inhabiting soft bottoms; it resembles S. spinosa described from Java and S. thorsoni Sendal...
Article
Innervation of unpaired branchial appendages is studied using confocal laser scanning microscopy in two annelid species: Terebellides cf. stroemii (Trichobranchidae) and Cossura pygodactylata (Cossuridae). The branchial filament is shown to be innervated by one unpaired segmental nerve coming from the ventral nerve cord at the level of chaetiger 2...
Article
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Juvenile and adult Cossura pygodactylata Jones 1956 from the White Sea were studied using confocal laser scanning microscopy, light microscopy, scanning and transmission electron microscopy. Transformations of the anterior musculature and digestive tract during ontogenesis were investigated. The early juveniles were shown to be lecithotrophic; thei...
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The fauna of Orbiniidae (Annelida: Errantia) from the Lizard Island has been studied. Five species were found and each was redescribed and illustrated using light microscopy and SEM. Scoloplos acutissimus Hartmann-Schröder, 1991 and Scoloplos dayi Hartmann-Schröder, 1980 collected for the first time since their original descriptions and confirmed t...
Article
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The collection of Cossuridae at the Australian Museum was investigated. Nine species were identified. Most specimens were from New South Wales and Queensland, but some specimens were also from Victoria, New Zealand, Fiji, Borneo, and the Philippines. Three new species were described: Cossura hutchingsae n.sp., C. keablei n.sp., and C. queenslandens...
Article
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Polychaetes show a remarkable diversity of the respiratory system structures. However, the ultrastructure of gills was studied only in some species from several families. The morphology and ultrastructure of the gills of Ophelia limacina, Ophelina acuminata, Euzonus arcticus, and Travisia forbesii (Opheliidae) were studied using light microscopy, s...
Article
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The structure of the epidermis of Travisia forbesii was described using light and electron microscopy. The epidermis is a highly modified variant of the normal one-layer polychaete epithelium. It consists of basal epidermal cells and an external layer of closely sited papillae consisting of glandular and supportive epidermal cells, and extensive el...
Article
The musculature of adult specimens of Cossura pygodactylata was studied by means of F-actin labelling and confocal laser scanning microscopy (CLSM). Their body wall is comprised of five longitudinal muscle bands: two dorsal, two ventral and one ventromedial. Complete circular fibres are found only in the abdominal region, and they are developed onl...
Article
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The morphology and anatomy of the pelagic polychaetous worm, Pelagobia longicirrata (Greef 1879), from the Southern ocean (Drake Strait) are described using histological methods and both light and scan electronic microscopy. An anterio-ventral gland complex and special ciliate fields are described for the first time. The presence of pharyngeal jaws...
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The foraging habits and diet of common eider (Somateria mollissima) were studied in the Velikaya Salma Strait (the Kandalaksha Bay, the White Sea (66°34' N, 33°07' E) in March, 2001 and 2002. The number of common eiders in the study area was estimated at 650 plusmn; 30 ind. in both years. In early March, the eiders fed mainly at the depths of 15-17...
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A new species of the genus Laubieriopsis Petersen, 2000 is described based on 28 specimens collected in the north-east part of the North Sea. It is characterized by fixed number of chaetigers (22), paired genital papillae, bidentate neurochaeta of chaetigers 1-4, the absence of acicular chaetae on chaetigers 5-21 and, on the last chaetiger, one aci...
Article
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The external and internal morphology of Laubieriopsis sp. from the North Sea was studied using light, scanning, and transmission microscopy. The morphology of the head end, parapodia, pigidium, body cavity, digestive tract, nervous system, and reproductive system was analyzed. The studied species was most similar to L. cabiochi (Amoreux, 1982) but...
Article
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The external and internal morphology of Laubieriopsis sp. from the North Sea was studied using light, scanning and transmission microscopy. The structure of the head end, parapodia, pigidium, body cavitiy, digestive tract, and nervous and sexual systems are analyzed. The specimens studied are the most similar to those of L. cabiochi (Amoreux, 1982)...
Article
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The fine structure of mouth parts was studied in 19 species from 13 genera belonging to the three families that are known to have a soft non-muscular axial proboscis: Orbiniidae, Opheliidae, and Scalibregmatidae. Four types of mouth structures divergent from the simple non-muscular axial proboscis were found. (1) A bubble-like symmetrical ciliated...
Article
The morphology of the obligately ectoparasitic polychaete Asetocalamyzas laonicola was studied by light and electron microscopy, and its taxonomic position was determined using molecular methods. The parasite has an extensive coelomic cavity, complete septae, and well-developed segmental nephridia, circulatory, and digestive systems. The nervous sy...
Article
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The sperm ultrastructure and spermatogenesis of the ectoparasitic polychaete Asetocalamyzas laonicola Tzetlin, 1985 (Calamyzidae) is investigated. The male cells are located freely in the coelom. The spermatocytes are large cells of irregular shape; their nuclei have condensed chromatin in the periphery. Spermatocyte cytoplasm is granular and elect...
Article
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The sperm ultrastructure and spermatogenesis of the ectoparasitic polychaete Asetocalamyzas laonicola Tzetlin, 1985 (Calamyzidae) is investigated. The male cells are located freely in the coelom. The spermatocytes are large cells of irregular shape; their nuclei have condensed chromatin in the periphery. Spermatocyte cytoplasm is granular and elect...
Article
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The structure and location of the diaphragm (gular membrane) was studied in five families of Terebelliformia: Terebellidae, Trichobranchidae, Pectinariidae, Ampharetidae and Alvinellidae, using dissections, histology, and scanning and transmission electron microscopy. Position, shape, and structure of the diaphragm differ in these taxa. In Terebell...
Chapter
Full-text available
The structure and location of the diaphragm (gular membrane) was studied in five families of Terebelliformia: Terebellidae, Trichobranchidae, Pectinariidae, Ampharetidae and Alvinellidae, using dissections, histology, and scanning and transmission electron microscopy. Position, shape, and structure of the diaphragm differ in these taxa. In Terebell...
Article
The annelid body wall generally comprises an outer layer of circular muscle fibres and an inner layer of longitudinal muscle fibres as well as parapodial and chaetal muscles. An investigation of Dysponetuspygmaeus (Chrysopetalidae) with confocal laser scanning microscopy showed that circular muscles are entirely absent. Further studies indicate tha...
Article
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The morphology of buccal parts was studied in twenty representative species of Terebellida belonging to the families Terebellidae, Ampharetidae, Trichobranchidae and Pectinariidae. The ultrastructure of the ventral pharyngeal organ was studied in Ampharete lindstroemii and juveniles of Nicolea zostericola and Pectinaria hyperborea. The ventral phar...
Article
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Alvinellidae (Terebellida) is a unique polychaete family. All alvinellids are found only in hydrothermal vents of the Pacific. The structure of digestive tract, blood an reproductive systems of Alvinella pompejana, A. candata, Paralvinella palmiformis, P. grasslci, P. dela, and P. pandora pandora was studied. Alvinellids have characters which set t...
Article
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Scoloplos armiger (Muller, 1776) is a widespread polychaete species, a unique species recorded in Russian seas. Studying the collection (370 specimens) of Scoloplos from the White, Barents and North Seas and Atlantic coast of the USA revealed the presence of the second species S. acutus (Verrill, 1873) considered previously as a junior synonym of S...

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