Difflugia elegans
 
Difflugia elegans, length 102-108 µm

 

 

Difflugia elegans Penard, 1890

 

Diagnosis: shell outline rough, pyriform usually with a constriction near the aperture to form a neck; an aboral tubular horn present, often curved and perforated at the apex; shell composed of small to large pieces of angular quartz and sometimes diatom frustules, bounded together by an organic cement; aperture usually circular, surrounded by an irregular mixture of particles which are collected to build a new shell; the apex of the test sometimes has two spines more or less symmetrically placed instead of a single spine. Nucleus spherical, with a number of nucleoli scattered throughout the nucleus; nucleoli with small lacunae.

 

Dimensions: Length in literature 80-162 µm; breadth 39-99 µm.

 

Remarks: Variation in the construction of the test is considerable, as is the length of the tubular horn, but the constriction behind the aperture distinguishes this species from D. bacillariarum which it closely resembles.

 

Difflugia elegans - Ferry Siemensma

 

Difflugia elegans, all shells descended from one specimen which multiplied in a moist-chamber-mount, 79-86 µm long - Naardermeer, The Netherlands
Difflugia elegans - Ferry Siemensma
 
Difflugia elegans, all shells from the same culture as above, 83-96 µm long - Naardermeer, the Netherlands
Difflugia elegans
Drawing Penard (1902) in Faune Rhizopodique du Bassin de Léman
Difflugia elegans
Difflugia elegans
Difflugia elegans, from Tirol, Austria; nucleus from the Austrian sample
Difflugia elegans
Difflugia elegans
Nucleus, stacked images

 

 
Difflugia elegans, from a peat bog in Tirol, Austria - 106-120 µm
Difflugia elegans - Ferry Siemensma
Difflugia elegans - Ferry Siemensma
Difflugia elegans, with pseudopodia, also in phase contrast
Difflugia elegans, 85 µm, with collected building material - rainforest lagoon, Peru