Alexander B. Tzetlin

Alexander B. Tzetlin
Lomonosov Moscow State University | MSU · N. A. Pertsov White Sea Biological Research Station

Doctor of Philosophy

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86
Publications
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937
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Publications

Publications (86)
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
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Краткий обзор современных исследований многолетней динамики донных сообществ, основных концепций и моделей динамики бентоса предваряет специальный выпуск журнала, содержащий результаты работ по изучению бентосных сообществ в различных масштабах пространства и времени.
Article
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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
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Phoronids are marine benthic animals that live in tubes in soft sediment or hard substrata; the phoronids form the tubes by digging or boring. Epidermal glands produce much of the material of the tube, which is completely imbedded in the soft sediment or hard substrata. The structure of phoronid tubes has not been previously studied in detail. In t...
Article
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Oligochaetes, despite their important role in terrestrial ecosystems and a tremendous biomass, are extremely rare fossils. The palaeontological record of these worms is restricted to some cocoons, presumable trace fossils and a few body fossils the most convincing of which are discovered in Mesozoic and Cenozoic strata. The Olenekian (Lower Triassi...
Article
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Although Arctic communities are very sensitive to global warming, direct evidence of the effects of high temperature on bottom communities is quite rare. We observed a mass mortality event (MME) of sponges by SCUBA diving in July and August 2018 along the coasts of Kandalaksha Bay, White Sea, and sub-Arctic. This event severely affected sponges fro...
Article
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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...
Conference Paper
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Velikaya Salma Strait is a part of fiard [1, 2], typical of features associated with Kandalaksha Bay of the White Sea [3, 5]. Bathymetry, subaquatic landscapes, and sediment were investigated within an area of 35.12 km2, at depths ranging from 10 to 120 m by means of geophysical, geological, and visual observations. The set of geophysical methods u...
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
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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
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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
Full-text available
Many marine annelids are active tube builders. Several polychaete families make agglutinated tubes by fixing sediment particles with specific secretions from their epithelial glands. The fine structure of the tubes of six species of Maldanidae from five genera ( Nicomache minor, N. lumbricalis, Maldane sarsi, Praxillella praetermissa, Axiothella ca...
Article
Caobangiids are an aberrant group of annelids with an unusual phoronid-like body plan. The most perceptible anatomical characteristic of caobangiids is the anal trunk, which is recurved outside the body and ends with an anal opening located near the head. So far neither the larval development nor the metamorphosis of these worms have been investiga...
Article
Full-text available
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
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
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...
Book
Издание состоит из шести тематических глав по физической географии, океанологии, гидрометеорологии, фауне и экологии, истории исследований и экономической освоенности акватории моря Лаптевых и прилегающих территорий. В атласе отражена подробная информация о типизации берегов моря Лаптевых, а также приведены актуальные сведения о морских млекопитающ...
Article
Full-text available
Pygospio elegans Claparède, 1863, the type species of the genus Pygospio, was originally described from Normandy, France, and later widely reported from boreal waters in the northern hemisphere. Sequence data of four gene fragments (2576 bp in total) of the mitochondrial 16S rDNA, nuclear 18S and 28S rDNA, and Histone 3 have shown that individuals...
Article
The results of the first study on the fine structure of agglutinated tubes of the family Terebellidae are presented.
Book
Издание состоит из шести тематических глав по физической географии, океанологии, гидрометеорологии, фауне, экологии, истории исследований и экономической освоенности акватории Карского моря и прилегающих территорий. В атласе отражена подробная информация о типизации берегов Карского моря, а также приведены актуальные сведения о морских млекопитающи...
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
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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
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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
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Rhynchospio glutaea (Ehlers, 1897), Rhynchospio arenincola Hartman, 1936 and Rhynchospio arenincola asiatica Chlebovitsch, 1959, originally described from Strait of Magellan, California, and South Kurile Islands respectively, appear similar to each other in adult morphology. These species and subspecies have been considered by some authors as subje...
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
During 2009-2012 stocks of the bivalve Arctica islandica (Linnaeus, 1767) (Ocean quahog) in Kandalaksha Bay (the White Sea) has been assessed using a side-scan sonar, grab sampling and underwater photo imaging. Structurally uniform localities were highlighted on the basis of side-scan signal. Each type of a signal reflects combination of sediment t...
Article
Full-text available
Chaetae are continually being replaced during the life of a polychaete, but the process of chaetal degeneration during replacement is still poorly known. Chaetal loss occurs either one at a time through special degenerative sites, or all chaetae in a chaetal sac are lost simultaneously in the absence of degenerative sites. Old chaetae can be either...
Article
Full-text available
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
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 tube-dwelling polychaete Pseudopotamilla reniformis (Sabellidae) forms dense and complex aggregations of flexible tubes on hard substrates in the subtidal zone of the White Sea. No sexual reproduction was observed in this study and recruitment appeared to be due to asexual reproduction by architomy in winter, from October to March. The posterio...
Article
Full-text available
The tube-dwelling polychaete Pseudopotamilla reniformis (Sabellidae) forms dense and complex aggregations of flexible tubes on hard substrates in the subtidal zone of the White Sea. No sexual reproduction was observed in this study and recruitment appeared to be due to asexual reproduction by architomy in winter, from October to March. The posterio...
Article
Abstract Ciliary folds form the dorsolateral walls of the foregut in numerous polychaetes. These feeding structures have not been recognized earlier. They are described here for 26 species in 16 families. The folds consist of ciliated cells, usually associated with gland cells, and have no intrinsic muscular system. Protraction of the dorsolateral...
Article
The alimentary canals of Trochonerilla mobilis and Nerillidium troglochaetoides consist of a ventral pharyngeal organ, oesophagus, stomach, intestine, and rectum. Prominent salivary glands lying lateral to the oesophagus discharge their secretions into the buccal cavity. Ciliated canals, the enteronephridia, embedded in the intestinal epithelium, o...
Article
The relationship of the polychaete taxa Syllidae and Sphaerodoridae within Phyllodocida is still unresolved: phylogenetic analyses either show them as sister groups or more widely separated. The present article aims to provide information about the structure of the muscular system that could be essential for understanding their relationship. A cruc...
Article
Full-text available
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
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
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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
This paper is part of a series investigating the muscular architecture of various “Polychaeta”, aiming to ascertain the presence of circular muscles in the body wall, which have recently been thought to be lacking more often than hitherto known. The F-actin muscular subset of Dorvillea kastjani was labelled with phalloidin and the architecture thre...
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
Sipuncula is a small taxon of worm-like marine organisms of still uncertain phylogenetic position. Sipunculans are characterized by an unsegmented body composed of a trunk into which the anterior part, the introvert, can be withdrawn. The group has been placed at various positions within Metazoa; currently, it is either seen as sister group of a cl...
Chapter
Full-text available
The alimentary canal of polychaetes consists of a foregut, midgut, and hindgut. The alimentary canal shows different specializations even in homonomously segmented polychaetes. The foregut gives rise to the buccal cavity, pharnyx and oesophagus, the midgut may be divided into a stomach and the intestine proper. Since polychaetes use a wide spectrum...
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
This paper is part of a series investigating the muscular architecture of various "Polychaeta", aiming to ascertain the presence of circular muscles in the body wall, which have recently been thought to be lacking more often than hitherto known. The F-actin muscular subset of Dorvillea kastjani was labelled with phalloidin and the architecture thre...
Article
Polydorella smurovi sp.n. is described from an underwater coral bank near the Dachlak Archipelago (Red Sea). This new species has alternating sexual and asexual (paratomy) reproduction, short caruncle, specialised broom-like setae on segment 5 and capillary setae in the neuropodia of the same segment. Worms inhabited the surface of a red sponge cov...
Article
A nerillid species new to science is described from the marine aquarium system of Moscow Zoo. Trochonerilla mobilis gen. et sp.n. is characterized by eight chaetigerous segments, three antennae, absence of palps, parapodia with two bundles of simple chaetae and pygidium with two anal cirri. In contrast to other eight-segmented nerillids, Trochoneri...
Article
Full-text available
The structure of the polychaete muscular system is reviewed. The muscular system comprises the muscles of the body wall, the musculature of the parapodial complex and the muscle system of the dissepiments and mesenteries. Various types of organisation of the longitudinal and circular components of the muscular body wall are distinguished. In Opheli...
Article
Full-text available
Recent investigations have suggested that a lack of circular muscle fibers may be a common situation rather than a rare exception in polychaetes. As part of a comparative survey of polychaete muscle systems, the F-actin musculature subset of Magelona cf. mirabilis and Prionospio cirrifera were labeled with phalloidin and three-dimensionally analyze...
Article
Two species of jaw bearing Ampharetidae (Adercodon pleijeli (Mackie 1994) and Ampharete sp. B) were investigated in order to describe the microanatomy of the mouth parts and especially jaws of these enigmatic polychaetes. The animals of both studied species have 14–18 mouth tentacles that are about 30 µm in diameter each. In both species, the ventr...