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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Cohnilembus

Cohnilembus Kahl, 1933 (ref. ID; 2014)

Class Oligohymenophora: Subclass Hymenostomata: Order Scuticociliatida (ref. ID; 2014)
Family Cohnilembidae (ref. ID; 7603)

Synonym; Lembus Cohn (ref. ID; 1618)

[ref. ID; 2014]
Small to large (30-150 um long) elongate ciliate, many species having an elongated neck-like region. The peristomial area extends from the apical pole down towards more or less the middle of the body although in some species it may only reach a third to the body length. There are 2 membranelles running along the right edge if of the peristome although one may be difficult to see. Somatic ciliation in 9 or 10 longitudinal rows, and there is a caudal cilium present. Contractile vacuole is terminally located. 1 or 2 macronuclei which are ovoid and sub-equatorial.
Quote; Colin R. Curds, Michael A. Gates and David McL. Roberts "British and other freshwater ciliated protozoa Part II Ciliophora: Oligohymenophora and Polyhymenophora" Cambridge University Press, 1983 (ref. ID; 2014)
  1. Cohnilembus anguilla (Kahl, 1931) (ref. ID; 3593) reported author and year? (ref. ID; 1622)
  2. Cohnilembus attenuatus Smith, 1897 (ref. ID; 1622)
  3. Cohnilembus caeci Powers (ref. ID; 1618)
  4. Cohnilembus fusiformis Cohn (ref. ID; 1618)
  5. Cohnilembus fusiformis Kahl, 1926 (ref. ID; 1308, 1622, 3593)
  6. Cohnilembus grassei Corliss & Snyder, 1986 (ref. ID; 7603 original paper)
  7. Cohnilembus kenti (ref. ID; 1622)
    Syn; Proboscella verminus (O.F. Muller) Kent, 1882 (ref. ID; 1622)
  8. Cohnilembus longivelatus (ref. ID; 1622)
  9. Cohnilembus punctatus Kahl, 1928 (ref. ID; 1335, 1662)
  10. Cohnilembus pusillus (Quennerstedt, 1869) Kahl, 1931 (ref. ID; 1219, 1622, 2245)
    Syn; Lembus moebii Kahl, 1926 (ref. ID; 1622); Lembadion ovale Gourret & Roeser, 1886 (ref. ID; 1622); Lembus pusillus Quennerstedt, 1869 (ref. ID; 1219); Lembus putrinus Kahl, 1928 (ref. ID; 1622); Uronema marina Moebius, 1888 (ref. ID; 1622)
  11. Cohnilembus reesi (ref. ID; 1622)
  12. Cohnilembus scaber Penard, 1922 (ref. ID; 1622)
  13. Cohnilembus stichotricha Kahl, 1928 (ref. ID; 1622, 3593)
  14. Cohnilembus subulatus Kent, 1882 (ref. ID; 1622)
  15. Cohnilembus verminus (O.F. Muller, 1786) (ref. ID; 1622, 2245, 4488) reported author and year? (ref. ID; 191)
    Syn; Lembus elongatus Claparede & Lachmann, 1859 (ref. ID; 1622); Lembus infusionum Calkins, 1903 (ref. ID; 1622); Lembus intermedius Gourret & Roeser, 1886 (ref. ID; 1622); Lembus ornatus Smith, 1899 (ref. ID; 1622); Lembus striatus Cohn-Fabre, 1885 (ref. ID; 1622); Lembus velifer Cohn, 1866 (ref. ID; 1622)
  16. Cohnilembus vexillarius Kahl, 1926 (ref. ID; 1622)
  17. Cohnilembus vexillifer (Entz, 1879) (ref. ID; 1622)
  1. Lembus anguilla (ref. ID; 1622)
  2. Lembus attenuatus Smith, 1897 (ref. ID; 1622)
  3. Lembus caeci Powers (ref. ID; 1618)
  4. Lembus fusiformis Kahl, 1926 (ref. ID; 1308, 1618, 1622)
  5. Lembus kenti (ref. ID; 1622)
    Syn; Proboscella verminus (O.F. Muller) Kent, 1882 (ref. ID; 1622)
  6. Lembus longivelatus (ref. ID; 1622)
  7. Lembus punctatus Kahl, 1928 (ref. ID; 1335, 1662)
  8. Lembus pusillus (Quennerstedt, 1869) Kahl, 1931 (ref. ID; 1622)
    Syn; Lembus moebii Kahl, 1926 (ref. ID; 1622); Lembadion ovale Gourret & Roeser, 1886 (ref. ID; 1622); Lembus pusillus Quennerstedt, 1869 (ref. ID; 1219); Lembus putrinus Kahl, 1928 (ref. ID; 1622); Uronema marina Moebius, 1888 (ref. ID; 1622)
  9. Lembus reesi Kahl (ref. ID; 1622, 2342)
  10. Lembus scaber Penard, 1922 (ref. ID; 1622)
  11. Lembus stichotricha Kahl, 1928 (ref. ID; 1622)
  12. Lembus subulatus Kent, 1882 (ref. ID; 1622)
  13. Lembus verminus (O.F. Muller, 1786) (ref. ID; 1622)
    Syn; Lembus elongatus Claparede & Lachmann, 1859 (ref. ID; 1622); Lembus infusionum Calkins, 1903 (ref. ID; 1622); Lembus intermedius Gourret & Roeser, 1886 (ref. ID; 1622); Lembus ornatus Smith, 1899 (ref. ID: 1622); Lembus striatus Cohn-Fabre, 1885 (ref. ID; 1622); Lembus velifer Cohn, 1866 (ref. ID; 1622)
  14. Lembus vexillarius Kahl, 1926 (ref. ID; 1622)
  15. Lembus vexillifer (Entz, 1879) (ref. ID; 1622)

Cohnilembus caeci Powers (ref. ID; 1618)

Descriptions

In the intestine of Tripneustes esculentus and other echinoids; Tortugas. (ref. ID; 1618)

Measurements

About 32-92 um long. (ref. ID; 1618)

Cohnilembus fusiformis Cohn (ref. ID; 1618)

Descriptions

Striation spiral; peristome about one-sixth the body length; a few cilia at posterior end; oval macronucleus central; contractile vacuole posterior; in fresh water. (ref. ID; 1618)

Measurements

About 60 um long. (ref. ID; 1618)

Cohnilembus grassei Corliss & Snyder, 1986 (ref. ID; 7603 original paper)

Descriptions

Finger-shaped body, 225 (150-280) um long, 45 (30-50) um wide (n=7). Centrally located oval macronucleus, 25x35 um. Two micronuclei, closely associated with the macronucleus, each 3 um in diameter. Apparent cytostome is located midway along the length of the cell. Forty-eight to fifty-two kineties are composed solely of single-kinetosome kinetids. OPK1 is composed of short (2 um) files of kinetosomes oriented perpendicular to the long axis of the body, extending from the apical end to one-third of the cell length. Cilia of OPK1 increase in length progressively posteriad, from 10 to 25 um. OPK2 kinetosomes form a trapezoid 13 kinetosomes in height, with six kinetosomes at the base (posterior) and four at the anterior tip, which abuts the posterior end of OPK1. The cilia of OPK2 are approximately 25 um in length. OPK3 kinetosomes form a patch 13 to 15 in number, with cilia approximately 15 um long. The ODK appears to be restricted to the oral inpocketing below OPK3. Scattered mucocysts were apparent over all of the somatic surface. (ref. ID; 7603)

Remarks

Specimens all contained large pennate diatomes (70-80 um). Other described species in the scuticociliate family Cohnilembidae and the genus Cohnilembus have at least some paired kinetosome kinetids, and have different arrangements of OPK's. All previously described species of the family are histophagous or are bactivores associated with animal decay: the new species thus appears to have a unique food preference. (ref. ID; 7603)

Etymology

An unusual scuticociliate named in honor of a most unusual protistologist, the late Professor P.-P. Grasse. (ref. ID; 7603)

Type locality

Samples of sea-ice pore water and sea-ice slush from the Weddell Sea, Antarctica. (ref. ID; 7603)

Cohnilembus pusillus (Quennerstedt, 1869) Kahl, 1931 (ref. ID; 1219, 1622, 2245)

Synonym

Lembus moebii Kahl, 1926 (ref. ID; 1622); Lembadion ovale Gourret & Roeser, 1886 (ref. ID; 1622); Lembus pusillus Quennerstedt, 1869 (ref. ID; 1219); Lembus putrinus Kahl, 1928 (ref. ID; 1622); Uronema marina Moebius, 1888 (ref. ID; 1622)

Description

Slender and spindle-shaped; uniform complete body ciliation; buccal cavity elongated, reaching from anterior pole to one-third of one-half the body length; oral ciliation consisting of 2 long membranes; macronucleus oval, central; endoplasm with rod-like, dark bodies; cilia never spread when at rest. (ref. ID; 1219)

Measurements

Length 30-50 um. (ref. ID; 1219)