The taxonomic status of Skrjabinalius guevarai Gallego & Selva, 1979 (Nematoda: Pseudaliidae) and the synonymy of Skrjabinalius Delyamure, 1942 and Halocercus Baylis & Daubney, 1925

Systematic Parasitology
Rachel PoolFrancisco J Aznar

Abstract

Within the cetacean lungworm family Pseudaliidae Raillet & Henry, 1909, the distinction between the two genera of the subfamily Halocercinae Delamure, 1952, i.e. Halocercus Baylis & Daubney, 1925 and Skrjabinalius Delyamure, 1942, is principally based on the structure and shape of the male copulatory bursa. In species of Halocercus, the bursa is unlobed, whereas in the two species included in Skrjabinalius, S. cryptocephalus Delyamure, 1942 and Skrjabinalius guevarai Gallego & Selva, 1979, the bursa is described as clearly lobed. During a parasitological analysis of cetaceans from the Spanish Mediterranean, we collected a number of specimens of S. guevarai with variable levels of bursal lobulation, including individuals with unlobed bursae. Examination of voucher specimens of the type-species of Halocercus, H. delphini Baylis & Daubney, 1925, collected from cetaceans in the North-East Atlantic revealed the same variations in bursal shape, and the same arrangement of bursal rays and papillae. A morphometric comparison did not reveal substantial differences between both species. Moreover, Maximum Likelihood and Bayesian Inference analyses of the second internal transcribed spacer (ITS2) sequences of 11 specimens of S. guevarai an...Continue Reading

References

Jun 1, 1975·Canadian Journal of Zoology·P W Arnold, D E Gaskin
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Aug 29, 2001·Bioinformatics·J P Huelsenbeck, F Ronquist
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Aug 1, 2012·Nature Methods·Diego DarribaDavid Posada
Jan 19, 2013·Molecular Biology and Evolution·Kazutaka Katoh, Daron M Standley
Aug 31, 2013·Bioinformatics·Jiajie ZhangAlexandros Stamatakis
Mar 24, 2016·Molecular Biology and Evolution·Sudhir KumarKoichiro Tamura

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Datasets Mentioned

BETA
MN747502

Methods Mentioned

BETA
light microscopy
PCR
electrophoresis

Software Mentioned

MAFFT
FigTree
MrBayes
R Core Team
jModelTest
R
ImageJ
PrimerBLAST
BioEdit
MEGA7

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