ISSN:
0362-2525
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Biology
,
Medicine
Notes:
The Ciliophora are unique in that they are heterokaryote. In certain ciliates, namely the Chlamydodontidae and Dysteriidae of the Order Holotrichida and Order Chonotrichida, the macronucleus has a chromophilic portion and a chromophobic portion. The similarities in structure and behavior of the macronucleus of Lobochona prorates to that of some lower holotrichs as well as the genesis of the ciliary mechanism suggest the close affinities of the Order Chonotrichida to the lower holotrichs - the cyrtophorine gymnostomes.Budding, a somewhat modified binary fission preserving the fundamental structure of the parent individual, appears to be an adaption to the sessile life of the Chonotrichida. Throughout the order the process is basically similar, but there are noticeable differences from genus to genus. There appear to be two distinct patterns of budding in the Chonotrichida: (1) the parent retains its fundamental structure, and (2) the parental cytosome diminishes. Both patterns may produce one or more (multiple) buds. Diminutive budding appears to be a mechanism of these sessile organisms which enables them to abandon the exuvium of the crustacean host and to reinfest the original host or a new host.Sexual reproduction is by conjugation. In L. prorates it occurs between adjacent individuals on the same pleopod of Limnoria tripunctata and not between a stationary individual and a “swarming” larva.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jmor.1051200404
Permalink
