A morphological and molecular study of Pseudocorynosoma Aznar, Perez Ponce de Leon and Raga 2006 (Acanthocephala: Polymorphidae) from Mexico with the description of a new species and the presence of cox 1 pseudogenes
Por:
Garcia-Varela, Martin, Henandez-Orts, Jesus S., Pinacho-Pinacho, Carlos D.
Publicada:
1 abr 2017
Resumen:
Pseudocorynosoma tepehuanesi n. sp., is described from the intestine of
the ruddy duck Oxyura jamaicensis Gmelin, 1789 from single locality from
northern Mexico. The new species is mainly distinguished morphologically
from the other five described species of Pseudocorynosoma from the
Americas (P. constrictum, type species, P. peposacae, P. anatarium, P.
enrietti and P. iheringi) associated with waterfowl species by
possessing a proboscis with 15 longitudinal rows with 7-8 hooks each, a
trunk expanded anteriorly and by having smaller lemniscus. Partial
sequences of the mitochondrial gene cytochrome c oxidase subunit I (cox
1) and the large subunit (LSU) of ribosomal DNA including the domains D2
+ D3 were used independently to corroborate the morphological
distinction between the new species and other two congeneric species (P.
constrictum and P. anatarium) from North America. The genetic divergence
estimated among the new species and the other two species ranged from 15
to 18% for cox 1 and from 32 to 4% for LSU. The cox 1 alignment shows
24 sequences from P. anatarium with abnormalities, which were defined as
pseudogenes due the presence of insertions, deletions and premature stop
codons. Maximum likelihood and Bayesian inference analyses with each
data set showed that the acanthocephalans from ruddy duck represent an
independent Glade with strong bootstrap support and posterior
probabilities. The phylogenetic tree inferred with cox 1 gene placed all
the pseudogenes from P. anatarium in single Glade suggesting that those
genes arose after speciation process within genus Pseudocorynosoma. The
morphological evidence, plus the monophyly in both phylogenetic analyses
indicate that the acanthocephalans collected from intestine of the ruddy
duck from northern Mexico represent a new species. (C) 2016 Elsevier
Ireland Ltd. All rights reserved.
Filiaciones:
Garcia-Varela, Martin:
Departamento de Zoología, Instituto de Biología, Universidad Nacional Autonoma de Mexico, Avenida Universidad 3000, Ciudad Universitaria, Distrito Federal, Mexico
Univ Nacl Autonoma Mexico, Inst Biol, Dept Zool, Avenida Univ 3000,Cuidad Univ, Mexico City 04510, DF, Mexico
Henandez-Orts, Jesus S.:
Instituto de Biología Marina y Pesquera Almirante Storni, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Güemes 1030, San Antonio Oeste, Río Negro, Argentina
Consejo Nacl Invest Cient & Tecn, Inst Biol Marina & Pesquera Almirante Storni, Guemes 1030, RA-8520 San Antonio Oeste, Rio Negro, Argentina
Pinacho-Pinacho, Carlos D.:
Departamento de Zoología, Instituto de Biología, Universidad Nacional Autonoma de Mexico, Avenida Universidad 3000, Ciudad Universitaria, Distrito Federal, Mexico
Universidad de la Sierra Sur, División de Estudios de Postgrado, Guillermo Rojas Mijangos S/N, Ciudad Universitaria, Miahuatlán de Porfirio Díaz, Oaxaca, Mexico
Univ Nacl Autonoma Mexico, Inst Biol, Dept Zool, Avenida Univ 3000,Cuidad Univ, Mexico City 04510, DF, Mexico
Univ Sierra Sur, Div Estudios Postgrad, Guillermo Rojas Mijangos S-N,Ciudad Univ, Miahuatlan De Porfirio D 70800, Oaxaca, Mexico
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