当前位置： SCI文献检索 > EUROPEAN JOURNAL OF PROTISTOLOGY期刊下所有文献 > A molecular phylogenetic investigation of Pseudoamphisiella and Parabirojimia (Protozoa, Ciliophora, Spirotrichea), two genera with ambiguous systematic positions.

A molecular phylogenetic investigation of Pseudoamphisiella and Parabirojimia (Protozoa, Ciliophora, Spirotrichea), two genera with ambiguous systematic positions.

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.

journal_name

Eur J Protistol

journal_title

European journal of protistology

authors

Yi Z,Song W,Warren A,Roberts DM,Al-Rasheid KA,Chen Z,Al-Farraj SA,Hu X

doi

10.1016/j.ejop.2007.08.002

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

45-53

issue

1

eissn

0932-4739

issn

1618-0429

pii

S0932-4739(07)00047-8

journal_volume

44

pub_type

杂志文章

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