September 14th 2007

(Number 1).

L. Bukhtiyarova & F.E. Round - Revision of the genus Achnanthes sensu lato section Marginulatae Bukht. sect. nov. of Achnanthidium Kütz. (pp. 1-30);  D. Flinn - The non-lacustrine-diatomite deposits of Unst, Shetland (pp. 31-40);  R.J. Flower, V.J. Jones & F.E. Round - The distribution and classification of the problematic Fragilaria (virescens v.) exigua Grun./Fragilaria exiguiformis (Grun.) Lange-Bertalot: a new species or a new genus- (pp. 41-57);  P.B. Hamilton, R. McNeely & M. Poulin - The morphology and distribution of Neidium distincte-punctatum Hustedt and its systematic position within the genus (pp. 59-71);  H.J. Kling - Stephanodiscus yukonensis spec. nov. (Bacillariophyceae) (pp. 73-80);  T.E. Reichardt - Die identität von Campylodiscus levanderi Hust. (pp. 81-87);  C. Riaux-Gobin & P. Compère - Observations sur le polymorphisme de Cocconeis californica Grunow, aux îles kerguelen (pp. 89103);  A.-M. Silva-Benavides - The epilithic diatom flora of a pristine and a polluted river in Costa Rica, Central America (pp. 105-142);  P. Snoeijs - The establishment of Lunella gen. nov. (Bacillariophyta) (pp. 143-154);  B. Stabell - Paralia thybergii sp. nov. - another fossil Paralia (pp. 155-163);  Y. Tanimura - Fossil marine plicated Thalassiosira: taxonomy and an idea on phylogeny (pp. 165-202);  F.E. Round - What characters define diatom genera, species and infra-specific taxa- (pp. 203-218);  J.P. Kociolek - Comment: Taxonomic instability and the creation of Naviculadicta Lange-Bertalot in Lange-Bertalot & Moser, a new catch-all genus of diatoms (pp. 219-222). 

(Number 2)

M. Caballero-Miranda - The diatom flora of two acid lakes in central Mexico (pp. 227-240);  H. Håkansson - Cyclotella striata complex: typification and new combinations (pp. 241-260);  G.R. Hasle, E.E. Syvertsen & C.H. Von Quillfeldt - Fossula arctica gen. nov., spec. nov., a marine Arctic araphid diatom (pp. 261-272);  Ye. V. Likhoshway - Stephanodiscus khurseviczae sp. nov. from Pleistocene sediments of Lake Baikal (pp. 273-281);  A.D. Mahood & J.A. Barron - Comparative ultrastructure of two closely related Thalassiosira species: Thalassiosira vulnifica (Gombos) Fenner and T. fasciculata Harwood et Maruyama (pp. 283-295);  J.N. Navarro - New observations on the araphid marine diatom Florella portoricensis (Florellaceae fam. nov.). (pp. 297-304);  O.E. Romero - Cocconeis sedimentaria sp. nov. (Bacillariophyta), a marine diatom from the coastal waters of the southeastern Pacific Ocean (pp. 305-316);  O.E. Romero & P. Rivera - Morphology and taxonomy of three varieties of Cocconeis costata and C. pinnata (Bacillariophyceae) with considerations of Pleuroneis (pp. 317-343);  F.E. Round & L. Bukhtiyarova - Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium (pp. 345-361);  F.E. Round & L. Bukhtiyarova - Epipsammic diatoms g communities of British rivers (pp. 363-372);  P.A. Sims & N.I. Hendey - Fontigonium, a new genus of biddulphioid diatoms (pp. 373-378);  I. Kaczmarska & G.A. Fryxell - Change of name for Nitzschia reimeri G. Fryxell & Kaczmarska (p. 379);  S.J.M. Droop - Correction - Diploneis splendida is an illegitimate name (pp. 381�
382).�

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