Main Content
< Top page

The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Cranotheridium

Cranotheridium Schewiakoff, 1892 (ref. ID; 2013) or 1893 (ref. ID; 3540)

Class Kinetofragminophora: Subclass Gymnostomata: Order Haptorida: Family Spathidiidae (ref. ID; 2013)

[ref. ID; 2013]
Body elongate, rounded in cross-section, posterior bluntly rounded. Anterior region of body characteristically terminates obliquely to the longitudinal body axis with a narrowed region behind the apex. Uniformly ciliated in parallel rows which meet anteriorly along the apical edge which may or may not bear an unciliated ridge. The oral aperture is rounded, apically situated and supported by trichites. Large terminal contractile vacuole with or without some small vacuoles on the ventral surface. Macronucleus either elongate, ribbon-like and twisted, or ovoid. Most easily confused with the genus Spathidium which has a slit-like oral aperture unsupported by trichites whereas Cranotheridium has a rounded, supported oral aperture.
Quote; Colin R. Curds "British and other freshwater ciliated protozoa Part I Ciliophora: Kinetofragminophora" Cambridge University Press, 1982 (ref. ID; 2013)
  1. Cranotheridium ariadnae Penard, 1922 (ref. ID; 1619, 3540)
  2. Cranotheridium elongatus Penard, 1922
    See; Pseudoprorodon lieberkuhni (ref. ID; 1619, 3540)
  3. Cranotheridium foliosus (Foissner, 1983) Wirnsberger, Foissner & Adam, 1984 (ref. ID; 4683 redescribed paper)
  4. Cranotheridium taeniatum Schewiakoff, 1893 (ref. ID; 1619, 3540) reported year? (ref. ID; 1618)

Cranotheridium taeniatum Schewiakoff, 1893 (ref. ID; 1619, 3540) reported year? (ref. ID; 1618)

Descriptions

Anterior end flattened; with a group of trichites; macronucleus long band-form; with many micronuclei; contractile vacuole terminal; ciliation and striation close; colorless; movement slow; fresh water. (ref. ID; 1618)

Measurements

About 170 um long. (ref. ID; 1618)