Phylogenetic Analysis of Caprellid and Corophioid Amphipods (Crustacea) Based on the 18S rRNA Gene, With Special Emphasis on the Phylogenetic Position of Phtisicidae

2008 ◽  
Vol 214 (2) ◽  
pp. 176-183 ◽  
Author(s):  
Atsushi Ito ◽  
Hiroshi Wada ◽  
Masakazu N. Aoki
2008 ◽  
Vol 63 (1-2) ◽  
pp. 127-132
Author(s):  
Fu Xiang ◽  
Long J. Yu ◽  
Wu Chen ◽  
Zhi Liu

Cell culture is an effective technology for taxol production. This paper discusses the effect of Taxus cell cultures on the 18S rRNA gene sequences based on the phylogenetic analysis of cultured T. chinensis cells and related species. The phylogenetic tree is reconstructed using the maximum parsimony method and the relative rate test to test the hypothesis of a molecular clock. The phylogenetic analysis indicates that cell culture changes the phylogenetic position of cultured T. chinensis cells. More than that, the 18S rRNA gene of cultured T. chinensis cells has a faster rate of substitution than that of T. chinensis. With T. media as reference, the divergence time of the cultured T. chinensis cells is 7 Ma (million years) more than that of the T. chinensis cells based on the 18S rRNA gene sequences.


Parasitology ◽  
2013 ◽  
Vol 140 (9) ◽  
pp. 1149-1157 ◽  
Author(s):  
R. MEGÍA-PALMA ◽  
J. MARTÍNEZ ◽  
S. MERINO

SUMMARYIn the present study we detectedSchellackiahaemoparasites infecting the blood cells ofLacerta schreiberiandPodarcis hispanica, two species of lacertid lizards from central Spain. The parasite morphometry, the presence of a refractile body, the type of infected blood cells, the kind of host species, and the lack of oocysts in the fecal samples clearly indicated these blood parasites belong to the genusSchellackia. Until now, the species of this genus have never been genetically characterized and its taxonomic position under the Lankesterellidae family is based on the lack of the exogenous oocyst stage. However, the phylogenetic analysis performed on the basis of the 18S rRNA gene sequence revealed that species of the genusSchellackiaare clustered withEimeriaspecies isolated from a snake and an amphibian species but not withLankesterellaspecies. The phylogenetic analysis rejects that both genera share a recent common ancestor. Based on these results we suggest a revision of the taxonomic status of the family Lankesterellidae.


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