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SEM image scalebar = 10 µm
Observations
| Observations: | Bart Van de Vijver |
|---|---|
| Length: | 15–25 µm |
| Width: | 7–8.5 µm |
| Striae: | 20–24 in 10 µm |
Description:
Valves rhombic to rhombic-elliptic (not simply elliptic) with broadly to obtusely rounded, nonproduced apices. Valve length 15–25 µm, valve width 7.0–8.5 µm. Axial area relatively broad, almost linear, leaving a distinct hyaline area bordering the raphe branches. Central area rather narrow, forming an almost rectangular to slightly wedge-shaped stauros. On both sides of the central area, one series of very small areolae (usually three) is present. One slightly transapically elongated stigma present, located rather isolated in the central area. Four fairly distinct pitlike depressions present in the central area, located halfway between the valve face margin and the valve center. Raphe branches short and curved. Central raphe endings weakly deflected opposite to the stigma-bearing valve side. Central pores slightly expanded. Terminal raphe fissures very short, weakly deflected. Transapical striae radiate throughout, 20–24 in 10 µm, each stria consisting of two to four small, rounded areolae. Areolae bordering the axial area distinctly larger. All other areolae small to even pinhead-like. Row of areolae alongside the valve face margin somewhat separated from the other areolae in the striae and consisting of somewhat transapically elongated areolae which increase in size towards the poles. Internally, poroids of the valve face usually occluded by hymenes, confluent with the striae, forming a continuous strip across the stria. Scrobiculi not visible in the central area. Internal stigma opening consisting of a curved, irregularly lipped slit.
| Morphology: | Naviculoid |
|---|---|
| Distribution: |
Autecology:
Notes:
Since almost 99% of the observed population has a striae density of 20–24 in 10 µm, this represents most probably the normal striae density. The valve shape of Luticola quadriscrobiculata is often observed within the genus Luticola. Luticola simplex Metzeltin, Lange-Bertalot & Garc?´a-Rodr?´guez, L. acidoclinata Lange-Bertalot and L. beyensii all present the same rhombic-elliptical outline without produced valve ends. They can however all be separated from L. quadriscrobiculata by the presence of the four pit-like depressions in the latter. The raphe structure in L. acidoclinata and L. beyensii differs by clearly hooked central raphe endings and elongated terminal fissures. Luticola mutica s.s. differs by the presence of hooked to strongly hooked central raphe endings and by the absence of the four typical markings in the central area. Moreover, L. mutica s.s. has a more elliptical, not rhombic, outline.
Other sites with Luticola quadriscrobiculata
- Crater Lake (soil), Deception Island
- Irizar Lake (soil), Deception Island
Original Type Description
| Author: | Van de Vijver 2008 |
|---|---|
| Length: | 15–25 µm |
| Width: | 7–8.5 µm |
| Striae: | 20–24 in 10 µm |
Original Description:
Valvae rhombeae ad rhombeas-ellipticas (non simpliciter ellipticae) apicibus late rotundatis sed non protractis. Longitudo 15–25 µm, latitudo 7.0–8.5 µm. Area axialis relative lata. Area centralis potius angusta formans staurum rectangularem ad paulum cuneatam. Stigma solitaria leviter transapicaliter elongata adest. Quattuor scrobiculi vadosi in area centrale distincte adsunt. Rami raphis curti curvatique extremis centralibus leviter deflexis pororum guttiformum. Fissurae terminales raphis indistinctae. Striae transapicales omnino radiatae, 20–24 in 10 µm. Areolae ad marginem valvae maiores quam areolae sitae prope raphem.
New combination
| Author: |
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Citations
Index Nominum Algarum (INA):
- Original
- New Combination
- If an INA link is available, it will be shown above
- The INA is a bibliographic reference "card file" for algal taxonomy, containing nearly 200,000 names of algae (in the broad sense).
