They range from 50 to 300 microns in length, with a characteristic irregular oblong shape which gives them their name.
Possibly first described by Huygens, organisms in this genus have a polyploid macronucleus and a diploid micronucleus, This genus are preyed upon by genus Didinium. UGA is the only stop codon in this genus, which can exchange genetic material with other members through conjugation, and which reproduces by binary fission. The species aurelia forms endosymbiotic relationships with Gram-negative bacteria, while species bursaria has an endosymbiotic relationship with the green algae Zoochlorella. They range from 50 to 300 microns in length, with a characteristic irregular oblong shape which gives them their name. For 10 points, name this widespread genus of ciliate protozoa.
Possibly first described by Huygens, organisms in this genus have a polyploid macronucleus and a diploid micronucleus, This genus are preyed upon by genus Didinium.
Paramecium [or paramecia]