Marine taxa of Cocconeis on leaves of Posidonia oceanica, including a new species and two new varieties

Eight Cocconeis Ehrenberg taxa (species and varieties) epiphytic on the leaves of Posidonia oceanica (L.) Delile were studied by scanning and transmission electron microscopy. Samples of Posidonia oceanica were collected throughout the year from seagrass meadows around the island of Ischia (Gulf of Naples, Italy). On the basis of some peculiar ultrastructural characteristics of the valve areolation, a new species, Cocconeis multiperforata sp. nov., and two new varieties, C. neothumensis var. marina var. nov., and C. scutellum var. posidoniae var. nov., are described. Ultrastructural analysis also revealed new morphological characteristics in C. britannica Naegeli in Ku$ tzing and C. maxima (Grunow) Peragallo & Peragallo, and confirmed observations of other authors for C. molesta var. crucifera Grunow, C. pellucida Grunow in Rabenhorst and C. stauroneiformis (Rabenhorst) Okuno. Our observations on the abundance of the different species provide new information on their distribution and ecology.

[1]  J. Kociolek,et al.  CATALOGUE OF THE DIATOM GENERA , 1999 .

[2]  M. Mizuno.  SEXUAL REPRODUCTION AND AUXOSPORE FORMATION OF THE MARINE MONORAPHID DIATOM COCCONEIS PELLUCIDA , 1998 .

[3]  O. Romero,et al.  MORPHOLOGY AND TAXONOMY OF THREE VARIETIES OF COCCONEIS COSTATA AND C. PINNATA (BACILLARIOPHYCEAE) WITH CONSIDERATIONS OF PLEURONEIS , 1996 .

[4]  C. Riaux-Gobin.  A check-list of the Cocconeis species (Bacillariophyceae) in Antarctic and Subantarctic areas, with special focus on Kerguelen Islands , 1994 .

[5]  T. Kawamura,et al.  SEASONAL CHANGES IN BENTHIC DIATOM COMMUNITIES COLONIZING GLASS SLIDES IN ABURATSUBO BAY, JAPAN , 1992 .

[6]  L. Mazzella,et al.  Epiphytic diatoms of leaf blades of the Mediterranean seagrass Posidonia oceanica (L.) Delile , 1992 .

[7]  V. Zupo,et al.  Primary Production and Growth Dynamics in Posidonia oceanica , 1992 .

[8]  C. Riaux-Gobin.  DIATOMÉES D'UNE VASIÈRE INTERTIDALE DU NORD FINISTÈRE (DOURDUFF): GENRES COCCONEIS, CAMPYLONEIS, DELPHINEIS, MASTOGLOIA ET RHAPHONEIS , 1991 .

[9]  David G. Mann,et al.  Diatoms: Biology and Morphology of the Genera , 1990 .

[10]  F. E. Round,et al.  Variability in the structure of the genus Cocconeis Ehr. (Bacillariophyta ) with special reference to the cingulum , 1982 .

[11]  J. Navarro.  Marine diatoms : associated with mangrove prop roots in the Indian River, Florida, U.S.A. , 1982 .

[12]  J. Navarro.  A Survey of the Marine Diatoms of Puerto Rico V. Suborder Raphidineae: Families Achnanthaceae and Naviculaceae (Excluding Navicula and Mastogloia) , 1982 .

[13]  D. Wujek,et al.  Catalog of the Fossil and Recent Genera and Species of Diatoms and Their Synonyms , 1968 .

[14]  Ruth Patrick,et al.  The diatoms of the United States exclusive of Alaska and Hawaii , 1966 .

[15]  R. Patrick,et al.  The diatoms of the United States. , 1966 .

[16]  J. W. G. Lund,et al.  An Introductory Account of the Smaller Algae of British Coastal Waters. Part V. Bacillariophyceae (Diatoms). , 1965 .

[17]  F. Hustedt,et al.  Die Kieselalgen : Deutschlands, Österreichs und der Schweiz : unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete , 1961 .

[18]  H. Okuno.  Electron-microscopical Study on Fine Structures of Diatom Frustules XVI , 1957 .

[19]  A. Cleve-Euler.  Die Diatomeen von Schweden und Finnland , 1955 .

[20]  H. Okuno.  Electron-microscopical study on fine structures of diatom frustules XI , 1953 .

[21]  H. Péragallo,et al.  Diatomées marines de France : et des districts maritimes voisins , 1897 .

[22]  G. B. D. Toni,et al.  Sylloge algarum omnium hucusque cognitarum , 1889 .

[23]  Van Heurck,et al.  Synopsis des diatomées de Belgique. ATLAS et TABLE / par le Dr. Henri Van Heurck,... , 1880 .

[24]  F. Hustedt,et al.  Atlas der Diatomaceen-Kunde , 1874 .

[25]  G. Walker-Arnott.  What are Marine Diatoms , 1859 .