Zoothamnium arbuscula Ehrenberg, 1838
Zoothamnium arbuscula, a sessilid ciliate characterized by the tree-like structure of the colony and macrozooids; one of them has detached from the colony (right upper corner). (1)
 
 
Zoothamnium arbuscula, zooids. (1)
 
 
Zoothamnium arbuscula, part of a colony, focus plane onone of the macrozooids, shortly before detaching from the colony. (1)
 
 
Zoothamnium arbuscula, part of a colony, focus plane on the stem. In the center a macrozooid, still attached to the stem. (1)
 
Zoothamnium arbuscula, swimming macrozooid. The arrow points to the scopula, the region where the next stem will protrude. (1)
 
Zoothamnium arbuscula, two images of the same macrozooid. Upper image: focal plane on the striated pellicula and the anterior trochus; lower image: focal plane on the horseshoe-like macronucleus and contractile vacuole. (1)
 
Zoothamnium arbuscula, base of the main stem; the arrow points to a joint between the basal part without axoneme and the upper part with axoneme. (1)
 
Zoothamnium arbuscula, is the host or diet of other organisms like rotifers. The rotifer Euchlanis cf deflexa upper image, lateral view) seems to be a predator of Zoothamnium. Also Pleurotrocha petromyzon (middle image, lateral view) could be observed feeding on the zooids. The bdelloid rotifer Philidina cf acuticornis (lower image, dorsoventral view), however, is only commensal.(1)
 
Zoothamnium arbuscula; also some (undentified) rotifer eggs were found in the colonies. (1)
 
Zoothamnium arbuscula; also some zooflagellata (?? Codosiga sp. ?? were observed as epibionts on this colony.(1)
 
 
 
 
Location (1); : Henrichsteich, Hattingen, NRW, Germany, pond
 
Habitat (1); : plankton-sample with algae and detritus (click image to enlarge >>>)
 
Date (1): 29.09.2022
 
 
 
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