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Translation Ssxie6 Iqo FjSIiERIkS AND'MARINE SERVICE Translation Ssxie6 IQo. 3096 $he]_1 microstructure and tlie;c1assification of the f âniily° 'âxdiidae 01 riginal title: MikrosL-rukturh rakoviny.ï.sistenz atika semèis_tva= From: Aritoreferat dlsseriatsiina . soiskanie. iichenoi stepeni kàndidat,à.., biôlogicheskikh .nauk (Author's Abstract, ctiPser.tation tor cr.egrqe;^ of Candidate of Bioldgica1 - Sciences, rioaçow, 1974).,':14 3-21 , 1974.. Trana7.ated .by the Translation ' Bureau (.7 Y.' • Multiliagual . Services Division i^iipartnent .pf the Secretary of State of Cane tia: Depàrtm-ent. of. tbe E+nvironment., Fisheries and:_Marinè.^ Ser:vice : Bio logical Station Nana:i.tntl,: B`. C'. 1974 23 pageb. rjrpaocr:^,pt r 'DEPARTMENT OF THE SECRETARY OF STATE SECRÉTARIAT D'ÉTAT TRANSLATION BUREAU BUREAU DES TRADUCTIONS MULTILINGUAL SERVICES DIVISION DES SERVICES CANADA DIVISION MULTILINGUES F1?'./03d !74 TRANSLATED FROM - TRADUCTION DE INTO - EN RUSS i an English AUTHOR - AUTEUR - S. V. Popov TITLE IN ENGLISH - TITRE ANGLAIS Shell microstructure and the classification of the family Cardiidae TITLE IN FOREIGN LANGUAGE (TRANSLITERATE FOREIGN CHARACTERS) TITRE EN LANGUE ETRANGÉRE (TRANSCRIRE EN CARACTÉRES ROMAINS) Mikrostruktura rakoviny i sistematikâ semeistva Cardiidae REFERENCE IN FOREIGN LANGUAGE (NAME OF BOOK OR PUBLICATION) IN FULL. TRANSLITERATE FOREIGN CHARACTERS. REFÉRENCE EN LANGUE ETRANGÉRE (NOM DU LIVRE OU PUBLICATION), AU COMPLET, TRANSCRIRF. EN CARACTÈRES ROMAINS. Avtoreferat dissertatsii na soiskanie uchenoi stepeni kandidata biologicheskikh nauk REFERENCE IN ENGLISH - REFERENCE EN r.NGLAIS Author's Abstract, dissertation for degree of Candidate of l3 i o( og i c.a l Sciences, iVïoscow, 1974. PAGE NUMBERS IN ORIGINAL PUBLISHER- EDITEUR DATE OF PUBLICATION NUMEROS DES PAGES DANS Pub 1. 11S5(z Acad. Sc i. DATE DE PUBLICATION L'ORIGINAL 3--21: YEAR ISSUE N0. VOLUME NUMERO PLACE OF PUBLICATION ANNEE NUMBER OF TYPED PAGES LIEU DE PUBLICATION NOMBRE DE PAGES Moscow, 11S512 DACTYLOGRAPHIEES '74 28 REQUESTING DEPARTMENT Env i ronment TRANSLATION BUREAU NO. 784405 MINISTÉRE-CLIENT NOTRE DOSSIER NO BRANCH OR DIVISION Fisheries Service TRANSLATOR (INITIALS) JW DIRECTION OU DIVISION TRADUCTEUR (INITIALES) PERSON REQUESTING F.K. Bernard, Pacific Biological 'Station, Nanaimo, B.C. DEMANDÉ PAR i^t UNl~D{TED T(.A,q:;I.ATION YOUR NUMBER 769-18-14 C7) VOTRE DOSSIER NO For informa: io:i only %;:r TRADUCTION NON [Z,-'VISEE DATE OF REQUEST 16. 4. 74 N DATE DE LA DEMANDE Information seulement ....^ SOS-200-10-6 (REV. 2/68) 7630-21-029-6333 • 1 • 'DEPARTMENT OF THE SECRETARY OF STATE SECRÉTARIAT D'ÉTAT .1 TRANSLATION BUREAU BUREAU DES TRADUCTIONS MULTILINGUAL SERVICES - DIVISION DES SERVICES DIVISION MULTILINGUES CLIENTS NO. DEPARTMENT • DIVISION/BRANCH cm No Du CLIENT MINISTE'RE DIVISION/DIRECTION VILLE Fisheries Service Nanaimo, B.C. 769-18-14 Environment . (Office of the Editor) BUREAU NO. LANGUAGE TRANSLATOR (INITIALS) N° DU BUREAU LANGUE . TRADUCTEUR (INITIALES) 784405 Russian ..TW „JUN 2 4 1974t From: Author's Abstract, dissertation for degree of Candidate of Biological Sciences, Moscow, 1974. Shell microstructure and the classification UNEDITED TRANSLATION For informa!ion only of the family Cardiidae TRADUCTION NON REVISEE information seulement (04 00 09. Paleontology and Stratigraphy) by S. V. Popov Scientific Director: C.A. Nevesskaya, Doctor of Biological Sciences Introduction The representatives of the family Cardiidae have been known since 3* the beginning of the Mesozoic eta, but it is only in the Cenozoic era that they become variegated, and at present they occur in all seas from the Arctic to the tropics, having adapted to the conditions of inland seas as well as to freshwater lagoons. The variety and rapid evolution of the members of Càrdiidae determined their stratigraphic importance, especially for the Cenozoic deposits of Southern Eurasia. The present author investigated, along with the usual conchological characters, the shell microstructure of many members of Cardiidae. The structure of about 130 species was studied, including that of 24 repre- sentatives of the 26 known genera of Cenozoic marine Cardiidae and 24 * Numbers in the right:hand margin indicate the page numbers of the original (Tr.). SOS-200-10-31 2 genera of Cardiidae of brackish waters which were endemic ta the Neogene-- Quaternary basins of the Paratethys. In order to determine the effect of environmental conditions on the shell structure, we studied more than 50 specimens of the most euryhaline species--the Cerastoderma glaucum-- from seas, estuaries and lagoons with different salinities. We made a total of about 2,000 grindings, 100 polished sections and more than 300 acetate films from etched surfaces. The shell structure of 35 species belonging to 25 genera was studied on a scanning and transmission electron microscope. The work included about 50 spectral semiquantitative analyses of the content of microelements in the shells, and we utilized the results of 25 determinations of isotope composition of the oxygen of the shell carbonate of the Cardiidae. The descriptive part of the dissertation includes diagnoses of 4 subfamilies, 26 genera and 20 subgenera of Cardiidae. This work would have been impossible without the collections belonging to L.A. Nevesskaya, R.L. Merklin, 0.M Petrov, A.G. Eberzin and N.P. Paramonova, as well as the data received from the following foreign scientists: V. Woodring (USA), A.Denis (France), K.Masuda (Japan) and B. Smith (Australia). Technical assistance and access to an electron microscope were made possible to the author by M.M. Kalashnikova, V.N. Kumanin (IMEZh), E.G. Popov (of the Moscow Institute of Geological Exploration (MGRI)) and A.Ya. Shevchenko (of the Oceanography Institute). The acetate replicas were prepared according to the method developed by A.M. Popov (of Kharkov State University (KhGU)). The investigation of éhe isotope composition of the shell was conducted in cooperation with S.D. Nikolaev and S.A. /4 3 Gorbarenko (of Moscow State University (MGU)). The author expresses his special gratitude to his coworkers of the laboratory in which the work was conducted, and to his supervisor L.A. Nevesskaya, Doctor of Biological Sciences, who determined the formulation of this theme. Chapter 1. Shell Structure of Bivalve Mollusca The shell of bivalve Mollusca consists of calcium carbonate, has an organic matrix and is covered externally by a thin organic layer--the periostracum. The shell is formed owing to epithelial secretion on the external surface of the animal's mantle. The external layer of the shell is formed by the epithelium at the mantle's edges; the intermediate layer is formed by the external surface of the mantle up to the point where the mantle muscle is attached, and, finally, the inner layer is secreted by the mantle's surface above the mantle muscle (Beedham, 1958). • The mineral composition of the shell layers can be calcite or aragonite. The mineral composition and structure of the carbonate sub- stance is apparently determined by the composition and structure of the organic matrix, which controls the calcification process. A study of shell sections of MollusCa showed that almost the entire diversity of their structure is made up of a few types of microstructures (BBggild, 1930; Taylor et al., 1969; 1973): Mother-of-pearl structure--always aragonite, composed of many:sided or rounded tablets forming layers parallel . to the surface of the shell (layered mother-of-pearl), or forming vertical stacks of crystals (lens- shaped mother-of-pearl); Foliated structure--formed of calcereous leaflets having a polygonal !.^ form and situated horizontally or diagonally relative to the surface, sometimes with alternating orientation; Simple prismatic structure--always aragonite or calcite, composed of vertical many-sided prisms diviJed by an organic matrix; Composite prismatic structure--always aragonite, formed of horizontally situated prisms of the first layer which are made up of smaller prisms radiating in fan-shaped fashion from the center of the large prisms; Intersecting-lamellar structure--always aragonite, consisting of several layers of lamellae, with the lamellae of the second layer being oriented opposite to the neighboring lamellae of the first layer; Composite intersecting-lamellar structure--always aragonite, /5 consisting of the same second-layer lamellae as in the previous structure but with a more varied and irregular orientation of blocks of such lamellae; Homogeneous structure--aragonite, consisting of small carbonate granules with a similar optic orientation inside large sections of the layer. The layers of the myostracum*, which are deposited beneath the point where the muscles are attached to the shell, are always of an irregular, thinly-prismatic structure. Chaptar 2. Shell Microstructure of Marine Cardiidae and its Significance for Classification and Phylogeny The shell structure was investigated with an optical microscope in reflected light on polarized radial, transverse and tangential ground sections, and on polished sections and acetate films in transmitted light. The carbonate replicas with slightly etched shell surfaces were * Translator's note: "myostracum": taken directly from the original Russian "miostrakum", for which no other equivalent English term is available. S studied with the aid of an electron transmission microscope; the radial and transverse shear surfaces of the shell whose natural edges were damaged were studied with tlr aid of an electron scanning microscope.
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