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Nebela carinata

 

P. carinata, 173-204 µm – Haaksbergerveen, the Netherlands, all from the same sample

 
Planocarina carinata (Archer 1867) Kosakyan et al., 2016

Diagnosis: Test oval-pyriform in broad lateral view, laterally compressed with a well-defined lateral flat keel, usually broader than 4 µm. The keel begins near the pseudostome. Small lateral pores are usually visible on each side about one-third the distance between the pseudostome and the fundus of the test. Test almost transparent, composed of oval and circular test plates often intermixed with pieces of organic cement. Pseudostome slightly curved in broad lateral view, with a thick organic lip.

Dimensions: shell L: 140-246 µm, B: 110- 175 µm. Pseudostome: 27-43 µm.

Ecology: Sphagnum vegetation

Remarks: This species has a characteristic thin but broad keel, but as Cash et al., (1909) noted, the degree of development of this feature is not constant and they suggested that this probably indicated a wide range of variability. Therefore P. carinata specimens are sometimes hard to distinguish from those of P. marginata. I find  both species often together.

Nebela carinata
Nebela carinata - Ferry Siemensma
P. carinata, in front view and lateral view – length 177 µm (left) and 188 µm, Austria
Nebela carinata
Part of the keel of P. carinata, partly build of the oval scales of Corythion specimens.
Nebela carinata
P. carinata – Vosges, France 2018
Nebela carinata
P. carinata – Vosges, France 2018
Nebela carinata
P. carinata, 196 µm – Haaksbergerveen, the Netherlands; stacked image
Nebela carinata
P. carinata 171 µm
Nebela carinata
P. carinata, 163 µm
Nebela carinata
P. carinata, 189 µm
Nebela carinata
Nebela carinata
P. carinata – length 223 µm, Store Mosse, Sweden
Nebela carinata
P. carinata – length 187 µm, Austria, Tirol
Nebela carinata
P. carinata – Austria, Tirol
P. carinata – length 201 µm, Norway
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