(Number 1) May 2005 Consalvey, M., Perkins, R.G. & Paterson, D.M – PAM fluorescence: a beginners guide for benthic diatomists (pp1–22);  Flower, R. – A taxonomic and ecological study of diatoms from freshwater habitats in the Falkland Islands, South Atlantic (pp23–96);  Mikkelsen, D.M., Ellegaard, M. & Lundholm, N. – Cytoplasmic and frustular ultrastructure and morphology of Plagiotropis tristis sp. nov. (Bacillariophyceae) (pp97–113);  Morales, E.A., Bahls, L.L. & Cody, W.R. – Morphological studies of Distrionella incognita (Reichardt) Williams (Bacillariophyceae) from North America with comments on the taxonomy of Distrionella Williams (pp115–135);  Novitski, L. & Kociolek, P. – Preliminary light and scanning electron microscope observations of marine fossil Eunotia species with comments on the evolution of the genus Eunotia (pp.137–143);  Prasad, A.K.S.K. & Livingston, R.J. – Fine structure and taxonomy of Synedropsis karsteteri sp. nov. (Fragilariaceae, Bacillariophyta), a bloom-forming, brackish-water, planktonic, araphid diatom from Perdido Bay, northeastern Gulf of Mexico (pp145–162);  Rivera, P. & Cruces, F.Stephanodiscus keutzingii Klee & Casper (Bacillariophyceae) from living material collected in Rapel Reservoir, Central Chile (pp 163–170);  Scheffler, W., Nicklisch, A. & Schönfelder, I. – Beiträge zur morphologie, ökologie und ontogenie der planktischen diatomee Cyclotella comensis Grunow. Untersuchungen an historischem und rezentem materia (pp 171–200);  Van Eetvelde, Y., Heilmann-Clausen, C., Dupuis, C. & Cornet, C. – The presence of (celesto-) barite diatom molds in Palaeogene deposits from Ølst and Albaekhoved (Denmark) (pp 201–210);  Opinion: Schmid, A-M.M. – The wall and membrane systems in diatoms: comment in reply to Medlin (2004) (pp 211–216);  Note: Cox, E.J. – A proposal to conserve the name Pinnularia gastrum Ehrenberg with a conserved type has been published (pp 217–218).

(Number 2) November 2005

Bixby, R.J. & Jahn, R.Hannaea arcus (Ehrenberg) R.M. Patrick: lectotypification and nomenclatural history (pp 210–226);  Bixby, R.J., Edlund, M.B. & Stoermer, E.F. – Hannaea superiorensis sp. nov., an endemic diatom from the Laurentian Great Lakes (pp 227–240);  Congestri, R., Cox, E.J., Cavacini, P. & Albertano, P. – Diatoms (Bacillariophyta) in phototrophic biofilms colonising an Italian wastewater treatment plant (pp 241–255);  Cubizolle, H., Serieyssol, K.K. & Argant, J. – Diatom and pollen evidence of Holocene vegetation dynamics and human impact on the Virennes Fenland (French Massif Central) (pp 257–273);  Garcia, M. – Araphid psammic diatoms from Brazilian sandy beaches I: an emended description to genus Pravifusus Witkowski, Lange-Bertalot & Metzeltin (pp 275–280);  Hamilton, P.B. & Jahn, R. – Typification of Navicula affinis Ehrenberg: type for the name of the genus Neidium Pfitzer (pp 281–294);  Jahn, R. & Kusber, W.-H. – Reinstatement of the genus Ceratoneis Ehrenberg and lectotypification of its type specimen: C. closterium Ehrenberg (295–304);  Jahn, R., Sterrenburg, F.A.S. & Kusber, W-H. – Typification and taxonomy of Gyrosigma fasciola (Ehrenberg) J.W. Griffith et Henfrey (pp 305–311); Nejadsattari, T. – The diatom flora of Lake Neure, Iran (313–333);  Reichardt, E. Gomphonema dubravicense Pantocsek eine taxonomische revision (335–349); Suto, I. – Taxonomy and biostratigraphy of the fossil marine diatom resting spore genera Dicladia Ehrenberg, Monocladia Suto and Syndendrium Ehrenberg in the North Pacific and Norwegian Sea (pp 351–374);  Toyoda, K., Cox, E.J., Sims, P.A. & Williams, D.M. – The typification of Achnanthes Bory based on Echinella stipitata Lyngbye, with an account of the morphology and fine structure of Lyngbye’s species (pp 375–386);  Vélez, M.I., Hooghiemstra, H. & Metcalfe, S. – Fossil and modern diatom assemblages from the savanna lake El Piñal, Colombia: an environmental reconstruction (pp 388–407); Note: Grachev, M., Sherbakova, T., Masyukova, Y. & Likhoshway, Y. – A potential zinc-binding motif in silicic acid transport proteins of diatoms (pp 409–411);  Reviews (pp 413–415;  Obituary: N.I. Hendey (pp 417–424).