SPECIES starting with "T"

 

Tabularia fasciculata

Fragilaria fasciculata
Echinella fasciculata
Ctenophora pulchella var. fasciculata

  1. Valves linear-lanceolate to lanceolate
  2. Axial area very broad
  3. Distinct central area not evident
  4. Striae costate

Araphid - Valves are linear-lanceolate to lanceolate. The apices are set off slightly, rounded but not capitate. The axial area is very broad. No central area is evident. Striae are costate.

Thalassiosira lacustris

Cyclotella  punctata
Stephanodiscus  punctatus

  1. Valve faces tangentially undulate
  2. Striae coarse
  3. Several marginal fultoportulae present
  4. Single marginal rimoportula present

Centric - The valve face is tangentially undulate. Striae are coarse and organized into somewhat radial rows. A ring of marginal fultoportulae is present. A prominent rimoportula is present on the valve face, close to the margin.

Thalassiosira weissflogii

Eupodiscus weissflogii
Conticribra weissflogii

  1. Valves flat
  2. Areolae fine
  3. Prominent rimoportula on valve margin

Centric - Valves are flat, with short mantles. Areolae are fine. A single, prominent rimoportula is present on the valve margin.

Tryblionella calida

  1. Valves slightly concave in the middle of the valve
  2. Apices protracted, narrowly rounded
  3. Narrow, indistinct fold present
  4. Transapical ribs distinct, 12-16 in 10 µm
  5. Fibulae number 7-9 in 10 µm

Nitzschioid - Valves are linear and slightly concave in the middle of the valve. The apices narrow, drawn out and narrowly rounded. A narrow, indistinct fold runs along the longitudinal axis of the valve. The fold is barely undulate, or may not appear elevated or depressed from the main valve surface. Transapical ribs are distinct. Striae are indistinct.

Tryblionella hungarica

Homoeocladia  hungarica

  1. Valve length 35-100 µm
  2. Ends protracted slightly and bluntly rounded
  3. The longitudinal fold is wide, running the length of the valve
  4. Fibulae distinct, numbering 8-11 in 10 µm

Nitzschioid - Valves linear, slightly concave in the middle, with the ends protracted slightly and bluntly rounded. Raphe keel with distinct fibulae numbering 8-11 in 10 µm. A longitudinal fold is wide, running the entire length of the valve.