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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Dinobryon

Dinobryon Ehrenberg

[ref. ID; 1618]
Solitary or colonial; individuals with vase-like, hyaline, but sometimes, yellowish cellulose test, drawn out at its base; elongated and attached to the base of test with its attenuated posterior tip; 1-2 lateral chromatophores; usually with a stigma; asexual reproduction by binary fission; one of the daughter individuals leaving test as a swarmer, to form a new one; in colonial forms daughter individuals remain attached to the inner margin of aperture of parent test and there secrete new tests; encystment common; the spherical cysts possess a short process; fresh water. (ref. ID; 1618)

[ref. ID; 3490]
The cells having a companulate lorica are free or epiphytic and solitary or forming a branching colony. There are usually two elongate chromatophores, one contractile vacuole and a single eye-spot in the fusiform cell tapering to a cytoplasmic stalk in the distal portion with which the cell attaches to the posterior region of the hyaline lorica. (ref. ID; 3490)
  1. Dinobryon bavaricum Imhof (ref. ID; 3496, 3703)
  2. Dinobryon borgeii Lemmermann (ref. ID; 3703)
  3. Dinobryon crenulatum W. & G.S. West (ref. ID; 3703)
  4. Dinobryon cylindricum Imhof (ref. ID; 3490)
  5. Dinobryon cylindricum Imhof var. palustre Lemmermann (ref. ID; 3703)
  6. Dinobryon divergens Imhof (ref. ID; 1618, 3490, 3703)
  7. Dinobryon sertularia Ehrenberg (ref. ID; 1618, 3490, 3703)
  8. Dinobryon sociale Ehrenberg (ref. ID; 3703)
  9. Dinobryon sociale var. americanum (Brunnthaler) Bachmann (ref. ID; 4878)
  10. Dinobryon stipitatum Stein (ref. ID; 3490)
  11. Dinobryon suecicum Lemmermann, 1903 (ref. ID; 3703)
  12. Dinobryon suecicum Lemmermann var. longispinum Lemmermann (ref. ID; 3703)

Dinobryon cylindricum Imhof (ref. ID; 3490)

Descriptions

The species having an elongate cylindrical lorica. (ref. ID; 3490)

Measurements

60-100 um in length and 10 um in oral diameter. (ref. ID; 3490)

Dinobryon divergens Imhof (ref. ID; 1618, 3490, 3703)

Descriptions

Great variation in different localities. (ref. ID; 1618)
Being 37-40 um in length of the lorica having two characteristic expansions in the median part. (ref. ID; 3490)

Measurements

26-65 um long. (ref. ID; 1618)

Dinobryon sertularia Ehrenberg (ref. ID; 1618, 3490, 3703)

Measurements

23-43 by 10-14 um. (ref. ID; 1618)

Dinobryon stipitatum Stein (ref. ID; 3490)

Descriptions

The lorica is long and straight with a slender tapering portion. (ref. ID; 3490)

Measurements

The size is 55-60 um in length and 8-10 um in oral diameter. (ref. ID; 3490)