Comprehensive Description

Description of Oxytricha

Species of this hypotrich ciliate are 40 to 260 microns long and are flexible. The genus is elongated, ovoid and dorso-ventrally flattened, with a flat ventral surface and arched dorsal surface. The oral cavity expands from the cytostome anteriorly. A pronounced adoral zone of membranelles extends from the cytostome along the left side of the cell and across the anterior end of the cell. The genus is very similar to Cyrtohymena and Notohymena. Two undulating membranes (one paroral and one endoral membrane) follwing a slightly curving path along the right side of the oral depression; in ventrally viewed silver stained cells the kineties of these two membranes usually cross. There are two marginal rows of somatic cirri which are not continuous at the posterior. The genus exhibits the typical oxytrichid ventral cirri pattern (8 frontal, 5 ventral and 4 or more transverse cirri). Usually, three caudal cirri extend from the posterior end. Typically two macronuclei are located in the central of the cell.
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Depth range based on 8 specimens in 5 taxa.

Environmental ranges
  Depth range (m): 0.5 - 0.5
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Oxytricha is a ciliate protozoan genus in the family Oxytrichidae.


The draft macronuclear genome of Oxytricha trifallax was published in 2013.[1]



  1. ^ Swart EC, Bracht JR, Magrini V, Minx P, Chen X, Zhou Y, Khurana JS, Goldman AD, Nowacki M, Schotanus K, Jung S, Fulton RS, Ly A, McGrath S, Haub K, Wiggins JL, Storton D, Matese JC, Parsons L, Chang WJ, Bowen MS, Stover NA, Jones TA, Eddy SR, Herrick GA, Doak TG, Wilson RK, Mardis ER, Landweber LF (2013). "The Oxytricha trifallax macronuclear genome: a complex eukaryotic genome with 16,000 tiny chromosomes". PLoS Biol. 11 (1): e1001473. doi:10.1371/journal.pbio.1001473. PMC 3558436. PMID 23382650. 

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