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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Hemicyclium

Hemicyclium Eberhard, 1862 (ref. ID; 2013)

Class Kinetofragminophora: Subclass Hypostomata: Order Nassulida: Suborder Microthoracina (ref. ID; 2013)

[ref. ID; 2013]
Body outline shape oval, highly compressed laterally, covered with rigid, delicate, slightly keeled armour. Ribs on armour crenulated. Somatic ciliature reduced to 3 semicircular rows of cilia on the ventral surface. Opening to the cytosome via a depression on the posterior ventral edge. The depression opens more to the side than the posterior as in Microthorax. Cytopharynx without trichites. There is a solid tooth-like structure on the anterior edge of the oral depression and the latter is ciliated on its right side. The macronucleus is centrally placed. There are 2 contractile vacuoles which lie just above the oral depression.
Quote; Colin R. Curds "British and other freshwater ciliated protozoa Part I Ciliophora: Kinetofragminophora" Cambridge University Press, 1982 (ref. ID; 2013)
  1. Hemicyclium lucidum Eberhard, 1862 (ref. ID; 1622) reported author and year? (ref. ID; 4611)
    Syn; Microthorax haliotideus Penard, 1922 (ref. ID; 1622); Microthorax sulcatus Roux, 1901 (ref. ID; 1622)