Pennate Diatoms

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Bacillarlineae raphe

Family Stellarimaceae Nikolaev 1988 ex Sims 8c Hasle 1990 Genera: Stellarima Hasle 8c Sims. Incertae sedis: Gossleriella Schütt Family Hemidiscaceae Hendey 1937 emend. Simonsen 1975 ex Hasle (this publication)

Genera: Actinocyclus Ehrenberg; Azpeitia M. Peragallo in Tempère 8c Peragallo, Hemidiscus Wallich; Ropería Grunow ex Pelletan.

Incertae sedis: Pseudoguinardia von Stosch Family Asterolampraceae H. L. Smith 1872 emend. Gombos 1980 Genera: Asterolampra Ehrenberg; Asteromphalus Ehrenberg.

Family Heliopeltaceae H. L. Smith 1872

Genera: Actinoptychus Ehrenberg; Aulacodiscus Ehrenberg.

Suborder Rhizosoleniineae

Valves primarily unipolar; no marginal ring of processes.

Family Rhizosoleniaceae De Toni 1890 Genera: Rhizosolenia Brightwell; Proboscia Sundström; Pseudosolenia Sundström; Guinardia H. Peragallo; Dactyliosolen Castracane. Suborder Biddulphiineae

Valves primarily bipolar; no marginal ring of processes. Family Hemiaulaceae Heiberg 1863 Genera: Cerataulina H. Peragallo ex Schütt; Climacodium Grunow; Eucampia Ehrenberg; Hemiaulus Heiberg. Family Cymatosiraceae Hasle, von Stosch, 8c Syvertsen 1983

Genera: Arcocellulus Hasle, von Stosch, 8c Syvertsen; Brockmanniella Hasle, von Stosch, 8c Syvertsen; Cymatosira Grunow; Minutocellus Hasle, von Stosch, 8c Syvertsen; Plagiogrammopsis Hasle, von Stosch, 8c Syvertsen. Incertae sedis: Lennoxia Thomsen 8c Buck

Family Chaetocerotaceae Ralfs in Pritchard 1861 Genera: Bacteriastrum Shadbolt; Chaetoceros Ehrenberg; Attheya T. West.

FIGURE 9 Schematic diagrams of centric and pennate diatom suborders with main features. Coscinodiscineae, valves with a marginal ring of processes, symmetry with no polarities; Rhizosoleniineae, valves unipolar, no marginal ring of processes; Fragilariineae, valves with sternum and no raphae; Bacillariineae, valve with sternum and raphe.

Family Lithodesmiaceae H. 8c M. Peragallo 1897-1908 emend. Simonsen 1979

Genera: Bellerochea Van Heurck emend, von Stosch; Ditylum J. W. Bailey ex L. W. Bailey; Lithodesmioides von Stosch; Lithodesmium Ehrenberg, Helicotheca Ricard; Neostreptotheca von Stosch emend, von Stosch. Family Eupodiscaceae Kiitzing 1849 Genus: Odontella C. A. Agardh.

PENNATE DIATOMS Order Bacillariales

Valve striae arranged basically in relation to a line Suborder Fragilariineae—Araphid pennate diatoms Sternum present (indistinct in one family)—Raphe absent. Fragilariineae is used here for families belonging to several orders of the class Fragilariophyceae F. E. Round. Family Fragilariaceae Greville 1833 Genera: Asterionellopsis F. E. Round in Round et al; Bleakeleya F. E. Round in Round et al.; Striatella C. A. Agardh; Synedropsis Hasle, Medlin, 8c Syvertsen + the species Fragilaria striatula Lyngbye.

Family Rhaphoneidaceae Forti 1912

Genera: Adoneis G. W. Andrews 8c P. Rivera; Delphineis G. W. Andrews; Neodelphineis Takano; Rhaphoneis Ehrenberg.

Family Toxariaceae F. E. Round in Round et al., 1990 Genus: Toxarium J. W. Bailey.

Family Thalassionemataceae F. E. Round in Round et al., 1990 Genera: Lioloma Hasle gen. nov., Thalassionema Grunow ex Mereschkowsky; Thalassiothrix Cleve 8c Grunow; Trichotoxon F. Reid 8c Round.

Suborder Bacillariineae—Raphid pennate diatoms: sternum and raphe present.

Bacillariineae is used here for families belonging to Achnanthales, Naviculars, and Bacillariales of the subclass Bacillariophycidae D. G. Mann.

Family Achnanthaceae Kützing 1844 Genus: Achnanthes Bory de St.-Vincent.

Family Phaeodactylaceae J. Lewin 1958 Genus: Phaeodactylum Bohlin.

Incertae sedis: Nanoneis R. E. Norris

Family Naviculaceae Kutzing 1844

Genera: Meuniera P. C. Silva nom. nov., Navicuia Bory de St. Vincent; Haslea Simonsen; Pleurosigma W. Smith; Ephemera Paddock; Banquisia Paddock; Membraneis Paddock; Manguinea Paddock; Plagiotropis Pfitzer emend. Paddock; Pachyneis Simonsen.

Family Bacillariaceae Ehrenberg 1831 Genera: Bacillaria Gmelin; Cylindrotheca Rabenhorst; Fragilariopsis Hustedt in A. Schmidt, 1990; Neodenticula Akiba 6c Yanagisawa; Pseudo-nitzschia H. Peragallo in H. & M. Peragallo, 1897-1908; Nitzschia Hassall.

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