Back to Protists Back to Bacillariophyta Back to Alphabetized Species List

Back to Completed Reports List

Diatom Glossary


Species Name: 

Thalassiophysa hyalina

   
Common Name:      None

 

I.  TAXONOMY

KINGDOM DIVISION CLASS GENUS
Protista
Bacillariophyta Bacillariophyceae Thalassiophysa

     


Figure 1.


Figure 2.


Figure 3.

 

SPECIES NAME: 
Thalassiophysa hyalina (Grev.) Paddock et Sims

COMMON NAME:
None

SPECIES DESCRIPTION:
Cells solitary, almost always found in girdle view (Fig. 1, living cell, arrow indicates incised raphe; arrowheads indicate cytoplasmic threads. Apical axis is 54µm).  The valves are flattened, keeled, and incised in the middle.  The raphe system curves into the ventral side near the center (Fig. 2, detail of central raphe area, SEM).  There is one flattened chloroplast per cell, oriented in the pervalvar axis, appearing suspended in the cell interior by a series of cytoplasmic threads (Fig. 1, arrowheads).  Paddock & Sims (1980; as Proboscidea) and Round et al. (1990) discussed the cell structure in detail.  

The apical axis is about 50-90µm, and the pervalvar axis is about 35-55µm (Fig. 3, LM phase contrast; apical axis is 63µm).  Striae are not visible in the light microscope, and they appear as indistinct poroids in SEM, numbering about 75 in 10µm (barely visible in Fig. 2).  It is a fairly common benthic species throughout the IRL, but never abundant.  It has a worldwide distribution in coastal bays and estuaries, from the tropics to boreal regions.
 

REFERENCES

Paddock B, Sims PA. 1980. Observations on the marine diatom genus Auricula and two new genera, Undatella and Proboscidea. Bacillaria 3: 161-196.

Round FE, Crawford RM, Mann DG. 1990. The Diatoms. Cambridge University Press, Cambridge (U.K.). 747pp.

 

Unless otherwise noted, all images and text by PE Hargraves
Editing and page maintenance by LH Sweat

For questions, comments or contributions, please contact us at:
irl_webmaster@si.edu
Page last updated: 22 September 2015


Copyright © 2015 Smithsonian Institution