Title
Morphogenesis of Kiitricha marina Nozawa, 1941 (Ciliophora, Spirotrichea), a
possible model for the ancestor of hypotrichs s. L.
Author-s
Shao, C., Song, W., Warren and AL-Rasheid, K. A. S.
Contact
lnfo.
Department
Major
Year
of
Publication
krasheid@ksu.edu.sa
Publisher
European Journal of Protistology. GERMANY. 45: 292–304.
Zoology Department
Ecology, Environmental Pollution and Protozoology
(2009).
Type
of Paper
Publication
Full Text No
(Yes,No)
Key words
Abstract
Marine ciliate;Ontogenesis;Phylogeny;Spirotrichea;Systematics
Recent
studiessuggestedthatthemarineciliate
Kiitricha
Nozawa,
1941representsabasalbranchinthespirotrichs.
The
presentstudyreflectsthemorphogeneticalinvestigationof
Kiitricha
marina
Nozawa,1941.Theresultslistedbelow
show
anextremelyunusualdevelopmentalpatterncomparedwithallotherknownformsintheclassSpirotricheaor
hypotrichss.l.
(i)
Thedifferentiationoftheciliarystructuresfromtheprimordiaoccursaftercelldivision.Thismakes
Kiitricha
marina
Nozawa,1941uniqueamonghypotrichss.l.
(ii)
Sincetheanlageoftheundulatingmembranesintheopisthederivesfromthedivisionofthededifferentiated
parentalstructureandthusisnotformedindependently,
Kiitrichamarina
Nozawa,1941isalsouniqueamong spirotrichs. (iii) Mostsomaticcirralstructuresappearinapostanlagepattern,i.e.allcirriexhibitaprimaryarrangementinthe
sense
thattheyaredistributedasthoughtheyhadjustbeensegregatedfromtheanlagen.
(iv)
Unlikemostotherknownhypotrichss.l.,theundulatingmembraneanlagedoesnotcontributeafrontalcirrus.
(v)
Thedorsalkinetiesareformedintwoways:(a)fromtheposteriorportionofthecirralanlagenwhichlater
generatethenewdorsalkinetysegments;and(b)bytheirregularproliferationofdikinetidsinthelongdorsal
kineties.
(vi)
Allcirralanlagenareformedintrakinetallyfromthededifferentiatedparentalcirrianddevelopinaprimary
mode.
Takencollectively,thesefindingssuggestthat
Kiitricha
is
abasalbranchinghypotrichandthereforea possiblemodelfortheancestorofthehypotrichss.l. & 2008
ElsevierGmbH.Allrightsreserved.