Elena Vortsepneva

Elena Vortsepneva
Lomonosov Moscow State University | MSU · Department of Biology

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46
Publications
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172
Citations

Publications

Publications (46)
Article
The rhipidoglossan radula, consisting of numerous teeth in each transverse row, is characteristic of phylogenetically distant groups of gastropods, including Vetigastropoda, Neritimorpha, and "lower" Heterobranchia. Previous studies have revealed the main patterns in the formation of the rhipidoglossan radula of vetigastropods, the main feature of...
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
Caudofoveata is a clade of worm‐like mollusks that lead a burrowing lifestyle in soft marine sediments. There are only a few references to peristaltic movement in members of Caudofoveata. The movement of individuals of Chaetoderma nitidulum collected from the White Sea and set into a transparent gelatin substrate was described by direct observation...
Article
Nudibranchia is a group of shell-less heterobranch gastropods characterized by highly specialized chemosensory cephalic organs known as rhinophores. Whereas the morphology of the rhinophore is an important taxonomic character, as the external structures are used when describing species. However, the internal morphology of the rhinophore has only be...
Article
The gastropod radula exhibits exceptional morphological variability. Despite this enormous diversity, the main patterns of synthesis of the teeth and radula membrane, characteristic of different groups can be identified. The rhipidoglossan radula contains numerous teeth in each transverse row and was found in phylogenetically distant groups of Gast...
Article
The rhipidoglossan radula, which is characterized by presence of a central tooth, several lateral teeth, and numerous (more than ten) long marginal teeth in each transverse row, is found in three different subclasses, i.e., Vetigastropoda, Neritomorpha and “lower” Heterobranchia. Details of radula formation and its ultrastructure have not been stud...
Article
The renewal and shedding of hard ectodermal structures are widespread in invertebrates. The most impressive example of these processes in Trochozoa is the cuticle shedding observed in Hirudo medicinalis, originally studied over a century ago. Here we investigate cuticle shedding across three leech species: Hirudo sp., Haemopis cf. sanguisuga, and E...
Article
Full-text available
The jaw apparatus in several annelid families represents a powerful tool for systematic approaches and evolutionary investigations. Nevertheless, for several taxa, this character complex has scarcely been investigated, and complete comparative analyses of all annelid jaws are lacking. In our comprehensive study, we described the fine structure of t...
Article
Spicules are mineral-based biocomposites skeletal structures that are widely distributed among phylogenetically distant groups of invertebrates (Porifera, Cnidaria, Mollusca, Echinodermata). Subepidermal spicules are formed under the ectodermal epithelium and are characterized for all groups except mollusks (Aplacophora, Polyplacophora, Bivalvia),...
Article
Nudibranch molluscs represent an interesting model group to study the evolution of feeding apparatus and feeding modes, being characterized by specialized buccal complex in combination with extremely diverse dietary preferences and multiply prey shifts in evolutionary history. However, the plasticity of the buccal complex morphology in response to...
Article
Full-text available
Development of the limpet Testudinalia testudinalis collected from the White Sea was studied using light and scanning electron microscopy. Cleavage and early development of T. testudinalis were consistent with the general pattern of patellogastropod development, differing in only minor details, such as temperature-dependent developmental rates. A p...
Article
Full-text available
The radula is the basic feeding structure in gastropod molluscs and exhibits great morphological diversity that reflects the exceptional anatomical and ecological diversity occurring in these animals. This uniquely molluscan structure is formed in the blind end of the radular sac by specialized cells (membranoblasts and odontoblasts). Secretion typ...
Article
Full-text available
Aplacophora is a small enigmatic group of worm-like molluscs covered by sclerites. The general morphology of the posterior end, including the gonopericardial system, in many species is well studied using light microscopy. However, knowledge of the ultrastructure of this complex is fragmentary and many questions concerning the excretion of metabolit...
Article
Full-text available
The radular morphology of the patellid species Testudinalia testudinalis (O. F. Müller, 1776) from the White Sea was studied using light, electron, and confocal microscopy. The radula is of the docoglossan type with four teeth per row and consisting of six zones. We characterize teeth formation in T. testidinalis as follows: one tooth is formed by...
Book
Full-text available
This Atlas contains a summary of the main invertebrate animals available for studying their embryology and development processes at the Pertzov White Sea Biological Station (WSBS) MSU, Russia. The illustrations used in the Atlas are collected thanks to the efforts of a large team of people working at the WSBS MSU. The release of the Atlas is timed...
Article
The morphology of the headfoot, foregut, radular sac, teeth and tooth formation of Conus pulicarius were studied using light and electron microscopy, as well as 3D-reconstruction techniques. The anterior digestive system of C. pulicarius is similar to that of other studied cone snails, consisting of a proboscis with numerous retractors, single sali...
Article
Full-text available
The drilling mode of feeding is known from two clades of Gastropoda: Caenogastropoda and Heterobranchia. However, the level of convergence and parallelism or homology among these two lineages is unclear. The morphology of the buccal complex is well studied for drilling caenogastro-pods, but poorly known for drilling nudibranchs. It is also unclear...
Presentation
The buccal armature usually plays important role in the feeding process of gastropods. By this term, the cuticular structures found in the buccal cavity, e.g., radula and jaws, are meant. In the case of nudibranchs, the features of buccal armature have a special importance in taxonomical studies due to specialization on different feeding objects an...
Presentation
Full-text available
The drilling feeding type is presented in both main nudibranch clades: Doridacea and Cladobranchia. We compared the morphology of the feeding apparatuses in two drilling nudibranch species: Vayssierea elegans (Baba, 1930) (Doridacea) and Eubranchus rupium (Møller, 1842) (Cladobranchia) in order to find out, whether morphology of the feeding apparat...
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...
Article
Full-text available
The general and fine morphology of the buccal armature and concomitant epithelia in Flabellina verrucosa were examined using light microscopy, cLSM, TEM, and SEM. A 3D-reconstruction of the radular sheath terminal end was constructed as well. Based on the obtained data, we suggest the mechanisms of jaw and radula syntheses for this species. The jaw...
Article
The morphology of the jaw apparatus of Mooreonuphis stigmatis was studied at different stages of development using light and electron microscopy as well as 3D reconstruction techniques. Three generations of maxillary apparatuses were identified. The first (larval) type of maxillae was found in juveniles that have from 4 up to 15 chaetigers. They ar...
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...
Presentation
Nudibranchia is a large order of gastropod molluscs, which is remarkable by morphological and biological diversity and can be characterized by especially wide range of feeding spectra. The evolution of nudibranch molluscs is closely related to their adaptation to feeding objects. The understanding of the transformational ways of food-obtaining appa...
Article
Full-text available
Buccal complex of Gastropoda is a complex structure consisting of the radula, odontophore and the buccal muscles. The general morphology and function of the buccal complex of Gastropoda was well-studied in several aspects. However, there are only a few integrated studies on both general and fine morphology, and the mechanism of feeding performed on...
Article
Full-text available
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...
Poster
Full-text available
Trochozoan ectoderm is very plastic and can form different cuticular structures, i.e. setae and jaws in polychaetes, radular teeth and jaws in molluscs, etc. The mechanisms of synthesis of these structures are extremely various. Despite the huge amount of data on morphology and synthesis of polychaete setae or molluscan radula, the overall pictu...
Article
Full-text available
The topology of the heart and the pericardium of the chiton Stenosemus albus (Linnaeus, 1767) (Mollusca: Polyplacophora) is described as a result of the study of the general morphology and ultrastructure of the cardiac complex. Application of 3D-reconstruction technology to a series of histological sections detected three invaginations of the peric...
Article
Jaws of various kinds occur in virtually all groups of Mollusca, except for Polyplacophora and Bivalvia. Molluscan jaws are formed by the buccal epithelium and either constitute a single plate, a paired formation or a serial structure. Buccal ectodermal structures in gastropods are rather different. They can be nonrenewable or having final growth,...
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
Full-text available
The fine structure of the jaw apparatus was studied by scanning electron microscopy in eight species of Patellogastropoda. The jaw apparatus is an unpaired two-layered dorsolateral structure with anterior and posterior wings attached to the odontophore by muscles. The jaw of Testudinalia tesulata (O.F. Müller, 1776) is a derivative of the cuticle t...
Article
Full-text available
The nervous system of the ectoparasitic male of Scolelepis laonicola (Tzetlin, 1985), which attaches to the dorsal side of the female, was investigated by immunohistochemical methods in combination with confocal laser scanning microscopy. The male's nervous system is reduced; no ganglia are found in the central nervous system. The circumesophageal...
Article
Full-text available
4 Corresponding author Abstract The muscular system of the dwarf ectoparasitic male of Scolelepis laonicola (Tzetlin, 1985) was reconstructed by Falloidin-TRITC technique and confocal scanning microscopy. The anterior part of the male penetrates the female. All four main longitudinal muscle strands of the male's body enter the female; they are twis...
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
Full-text available
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
Full-text available
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...

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Projects (3)
Project
An investigation of mechanisms and patterns of obligate symbionts acquisition and the formation of chimeric organisms is one of the fundamental areas of modern biological studies. The primary goal of this project is to study the process of nematocysts obtaining by nudibranch molluscs. This phenomenon is characterized by a high functional integration of host tissues and foreign organelles with the formation of specialized organs (cnidosacs), and performance of unique behavioural patterns. At the same time, while nematocysts of various types and maturity undergo a selection, its particular mechanism is still unknown. Thus, a detailed and comprehensive study of this process may become a basis for expanding fundamental ideas on mechanisms of chimeric organisms formation. The nematocysts sequestration is associated with feeding preferences of nudibranchs, and, in particular, with morphology of the feeding apparatus (buccal complex) and a performed feeding mode. The proposed project is aimed at analyzing the general and fine morphology of cnidosacs and relative structures, and the general morphology of buccal complexes in nudibranch mollusks in order to analyze their evolutionary transformations. This project implies a combination of comparative anatomical analysis methods, including the electron and confocal microscopy, with modern molecular phylogenetic methods. Comparison of cnidosacs anatomy of phylogenetically distant groups will help to determine main evolutionary mechanisms that gave rise to an unusual phenomenon of nematocysts sequestration.
Project
Department of Invertebrate Zoology, Moscow State University (DIZ MSU), is happy to offer the following pre-congress workshop, “Comparative anatomy of invertebrates” from 11–17 August 2017. This practical course will investigate the comparative anatomy of several groups of invertebrates, including Porifera, Cnidaria, Echinodermata, Annelida, Platyhelminthes, Mollusca, Lophophorata, Arthropoda, Tardigrada, Nematoda, Nematomorpha, and Priapulida. Daily classes will comprise of lectures covering the peculiarities of the different invertebrates groups in relation to morphology, anatomy, and histology (including ultrastructure). Practical sessions will be hands-on, engaging students though investigations of external morphology, anatomy, and histology of the different organ systems through dissections and examination of histological sections. By the end of the course, a round table discussion will take place, where students and lecturers will compare the organization of the examined specimens, evaluating their morphological traits in light of invertebrate evolution. Participants who successfully pass this course will receive a certificate of course completion. http://www.icim4.com/workshops
Project
Dear colleagues! On behalf of The International Society for Invertebrate Morphology, Lomonosov Moscow State University, The Paleontological Institute of Russian Academy of Sciences and The ICIM4 Organizing Committee, we cordially invite you to attend the 4th International Congress on Invertebrate Morphology (ICIM4) to be held in August 18–23, 2017 in Moscow, Russia. For more information please visit site of ICIM http://www.icim4.com/