From Zlatogursky et al., 2016

 

Acanthocystis amura Zlatogursky, Gerasimova et Plotnikov, 2016

Diagnosis: Cell diameter 9.1 to 14.2 µm. Spine scales of two types. Type 1 spine scales 1.3–4.8 µm with four small hooks on the tip. Type 2 spine scales 1.0–3.6 µm with four, sometimes three or five teeth on the tip. Plate scales oval, 1.2–2.6 x 1.0–1.8 µm, with axial thickening and thickened border.

Ecology: Freshwater. Type locality. The Amur River, the Far East of Russia, the sandy bank. N 50°15’5” 35 E 127°32’51”. Collected in August of 2012.

Remarks: The morphology of Acanthocystis amura resembles that of Acanthocystis quadrifurca. They both have similar spine scales but their plate scales are completely different. A. valdiviense differs from the new species in absence of hook-bearing scales. Molecular phylogeny based on 18S rDNA consistently placed A. amura into A. nichollsi/A. costata clade, but relationships between those three species were not resolved. Morphology of another centrohelid strain from another location (the South Urals) has been compared with that of the original strain and few minor differences in size characteristics of the scales have been revealed.

Recent posts

Lesquereusia gibbosa

L. gibbosa, after Thomas and Gauthier-Lièvre, 1959 Lesquereusia gibbosa Thomas et Gauthier-Lièvre, 1959 Diagnosis: At the base of the neck there is a clear constriction,

Read More »

Lesquereusia extranea

L. extranea, after Thomas and Gauthier-Lièvre, 1959 Lesquereusia extranea Awerintzew, 1906 Diagnosis: Generally, the test resembles that of L. epistomium, but it also presents intermediate

Read More »

Lesquereusia carinata

L. carinata. The two small drawings to the left are after Playfair, 1917, the others after Thomas and Gauthier-Lièvre, 1959. Lesquereusia carinata Playfair, 1917 Diagnosis:

Read More »

Lesquereusia bispiralis

L. bispiralis, after Thomas and Gauthier-Lièvre, 1959 Lesquereusia bispiralis Thomas et Gauthier-Lièvre, 1959 Diagnosis: Neck with two septa. The neck is not cylindrical or conical,

Read More »

Lesquereusia angulata

L. angulata, after Thomas and Gauthier-Lièvre, 1959 Lesquereusia angulata Awerintzew, 1906 Diagnosis: The neck is long and straight and does not taper towards the aperture;

Read More »

Lesquereusia globulosa

L. globulosa, after Thomas and Gauthier-Lièvre, 1959 Lesquereusia globulosa Thomas et Gauthier-Lièvre, 1959 Diagnosis: Main part of the test spherical, not compressed, with a large

Read More »