Recent Pages

Belongs within: Bacillariophyceae.Contains: Surirellaceae, Amphiprora, Diploneis, Frustulia, Anomoeoneis, Schizonema, Mastogloia, Nitzschiaceae, Striatellaceae, Micromega, Rhopalodia, Eunotia, Epithemia, Navicula, Gyrosigma, Pleurosigma, Cocconeis, Achnanthes, Achnanthidium, Gomphonema, Cymbella, Amphora, Stauroneis, Pinnularia, Caloneis. The Bacillariophycidae are a clade of diatoms characterised by the development of a specialised motile organ, the raphe. Characters (Adl et al. 2019): Usually solitary and motile, less often chain-forming or colonial (linked by stalks or living… Continue reading Bacillariophycidae

Belongs within: Diatomeae.Contains: Fragilariaceae, Bacillariophycidae, Rhaphoneis, Plagiogramma. The Bacillariophyceae include diatoms with bilateral, usually bipolar valves. Characters (Adl et al. 2019): Chain-forming, colonial or solitary; valve outline almost always bipolar; valve pattern organized bilaterally about elongate axial rib (sternum), as in a feather; valve structure simple or chambered; rimoportulae generally only one or two per valve or none, sometimes accompanied (or replaced?)… Continue reading Bacillariophyceae

Belongs within: Fragilariaceae. Licmophora is a genus of diatoms forming flabellate clusters borne on stipes (Crosby & Ferguson Wood 1959). Characters (Crosby & Ferguson Wood 1959): Cells flabellate, in clusters of two or more, on short or long stipes; frustules in girdle view cuneate, with apical corners slightly rounded, intercalary bands present; septa more or less superficial,… Continue reading Licmophora

Belongs within: Fragilariaceae. Grammatophora is a genus of diatoms with quadrangular frustules. Characters (Crosby & Ferguson Wood 1959): Cells adnate or in zig-zag chains, usually free; frustules quadrangular, with rounded corners, divided by two nearly straight or sinuate, perforate septa; valves with straight, convex, or sinuous sides. Pseudoraphe present; surface with transverse, punctate striae; chromatophores granular or in… Continue reading Grammatophora

Belongs within: Bacillariophycidae. The Nitzschiaceae are a group of diatoms with elongated, bilaterally symmetrical valves. The raphe system is well developed and enclosed in a canal, and usually positioned on a single valve margin. <==Nitzschiaceae [Bacillariaceae, Bacillariales, Biraphidineae] |–CrucidenticulaEB93 |–NeodenticulaEB93 |–CymatonitizschiaEB93 |–DenticulopsisEB93 |–GomphonitzschiaEB93 |–PseudoeunotiaEB93 |–SimonseniaEB93 |–CylindrothecaEB93 | |–C. gracilisM01 | `–C. signataUPS98 |–Fragilariopsis Hust. in… Continue reading Nitzschiaceae

Belongs within: Bacillariophyceae. Rhaphoneis is a genus of diatoms with linear, narrow frustules. Characters (Wood 1961a): Frustules linear, narrow; valves elliptical to lanceolate; striae transverse, more or less radiating, moniliform; pseudoraphe usually narrow. <==Rhaphoneis Ehrenberg 1844G75 |–R. amphiceros Ehrenberg 1844W61a [incl. R. rhombusCFW59] | |–R. a. var. amphicerosW61a | |–R. a. var. crucifera (Kitton) Wood 1961 [=Amphitetras crucifera… Continue reading Rhaphoneis

Belongs within: Bacillariophycidae. Epithemia is a genus of epiphytic diatoms with arcuate valves (Crosby & Ferguson Wood 1959). Characters (Crosby & Ferguson Wood 1959): Frustules epiphytic, solitary, sometimes geminate, adherent on ventral side at ends; girdle view rectangular, elliptic or sub-orbicular; valves arcuate with interior stratum or transverse septa, extending to girdle, often detached, exterior valve surface with… Continue reading Epithemia

Belongs within: Bacillariophycidae. Cymbella is a genus of diatoms with more or less asymmetrical valves (Crosby & Ferguson Wood 1959). Characters (Crosby & Ferguson Wood 1959): Frustules free, stipitate or in gelatinous tubes; valves more or less asymmetrical along longitudinal axis, linear, elliptic, cymbiform or arcuate; median line excentric, straight or curved; striae usually radiate and more or… Continue reading Cymbella

Belongs within: Bacillariophycidae. Pleurosigma is a genus of diatoms with sigmoid frustules. Characters (Crosby & Ferguson Wood 1959): Cells solitary, free; frustules in valve view sigmoid. Valves with central and terminal nodules; raphe usually sigmoid, often more so than valve margin; cell surface delicately marked by longitudinal or oblique and transverse striae. <==Pleurosigma Smith 1852G75 |–P. acuminatumG64 |–P.… Continue reading Pleurosigma