The ultrastructure of Amylovorax dehorityi comb. nov and erection of the Amylovoracidae fam. nov (Ciliophora : Trichostomatia)

Cameron, Stephen L. and O'Donoghue, Peter J. (2002) The ultrastructure of Amylovorax dehorityi comb. nov and erection of the Amylovoracidae fam. nov (Ciliophora : Trichostomatia). European Journal of Protistology, 38 1: 29-44. doi:10.1078/0932-4739-00841


Author Cameron, Stephen L.
O'Donoghue, Peter J.
Title The ultrastructure of Amylovorax dehorityi comb. nov and erection of the Amylovoracidae fam. nov (Ciliophora : Trichostomatia)
Journal name European Journal of Protistology   Check publisher's open access policy
ISSN 0932-4739
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1078/0932-4739-00841
Volume 38
Issue 1
Start page 29
End page 44
Total pages 16
Place of publication Germany
Publisher Urban & Fischer Verlag
Language eng
Subject C1
270308 Microbial Systematics, Taxonomy and Phylogeny
780105 Biological sciences
Abstract The ultrastructural features of the holotrichous ciliates inhabiting macropodid maruspials were investigated to resolve their morphological similarity to other trichostome ciliates with observed differences in their small subunit rRNA gene sequences. The ultrastructure of Amylovorax dehorityi nov. comb. (formerly Dasytricha dehorityi) was determined by transmission electron microscopy. The somatic kineties are composed of monokinetids whose microtubules show a typical litostome pattern. The somatic cortex is composed of ridges which separate kinety rows, granular ectoplasm and a basal layer of hydrogenosomes lining the tela corticalis. The vestibulum is an invagination of the pellicle lined down one side with kineties (invaginated extensions of the somatic kineties); transverse tubules line the surface of the vestibulum and small nematodesmata surround it forming a cone-like network of struts. Cytoplasmic organelles include hydrogenosomes, irregularly shaped contractile vacuoles surrounded by a sparse spongioplasm, food vacuoles containing bacteria and large numbers of starch granules. This set of characteristics differs sufficiently from those of isotrichids and members of the genus Dasytricha to justify the erection of a new genus (Amylovorax) and a new family (Amylovoracidae). Dasytricha dehorityi, D. dogieli and D. mundayi are reassigned to the new genus Amylovorax and a new species A. quokka is erected. While the gross morphological similarities between Amylovorax and Dasytricha may be explained by convergent evolution, ultrastructural features indicate that these two genera have probably diverged independently from haptorian ancestors by successive reduction of the cortical and vestibular support structures.
Keyword Microbiology
Amylovorax
Dasytricha
Haptoria
Hydrogenosomes
Trichostomatia
Cytology
Protozoa
Genus
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemistry and Molecular Biosciences
 
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