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|Title: ||A molecular phylogenetic investigation of Pseudoamphisiella and Parabirojimia (Protozoa, Ciliophora, Spirotrichea), two genera with ambiguous systematic positions|
|Authors: ||Yi, Zhenzhen|
Roberts, David McL.
Al-Rasheid, Khaled A.S.
Al-Farraj, Saleh A.
Parabirojimina n. suborder
Parabirojimidae n. fam.
Small subunit rRNA
|Issue Date: ||2007 |
|Citation: ||European Journal of Protistology: 44 (1) ; 45–53|
|Abstract: ||The gene coding for the small subunit ribosomal RNA molecule was sequenced in three marine spirotrichs:
Pseudoamphisiella lacazei, P. alveolata, and Parabirojimia similis, the systematic positions of which remain unclear in
spite of recent progress. Phylogenetic trees were constructed by means of neighbor-joining (NJ), least-squares (LS),
maximum parsimony (MP), and Bayesian inference (BI) methods in order to test previously inferred phylogenetic
assignments of Pseudoamphisiella and Parabirojimia based on morphological and morphogenetic data. The main
results are that: (1) all trees constructed have similar topologies in which the genus Parabirojimia derives at the base of
the class Stichotrichia, which suggests that it might represent a unique taxon at about suborder or even-order level near
urostylids; (2) the present study supports the conclusion reported by previous researchers that urostylids could be
a paraphyletic assemblage and that Uroleptus and Paruroleptus should be removed from the order Urostylida;
(3) Pseudoamphisiellidae/Pseudoamphisiella always clusters with Prodiscocephalus borrori rather than with urostylids,
which indicates that they might represent an ancestral form for both discocephaline and urostylid species; (4) the
monophyly of the traditional suborder Discocephalina and typical euplotids is consistently rejected. Based on both
morphological/morphogenetical and molecular data obtained, a new suborder Parabirojimina n. subord. is suggested,
which currently includes one family, Parabirojimidae n. fam., and the single genus Parabirojimia.|
|Appears in Collections:||College of Science|
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