Gastrotricha: a marine sister for a freshwater puzzle.

PloS One
M Antonio TodaroCarlos E F Rocha

Abstract

Within an evolutionary framework of Gastrotricha Marinellina flagellata and Redudasys fornerise bear special interest, as they are the only Macrodasyida that inhabit freshwater ecosystems. Notwithstanding, these rare animals are poorly known; found only once (Austria and Brazil), they are currently systematised as incertae sedis. Here we report on the rediscovery of Redudasys fornerise, provide an account on morphological novelties and present a hypothesis on its phylogenetic relationship based on molecular data. Specimens were surveyed using DIC microscopy and SEM, and used to obtain the 18 S rRNA gene sequence; molecular data was analyzed cladistically in conjunction with data from 42 additional species belonging to the near complete Macrodasyida taxonomic spectrum. Morphological analysis, while providing new information on taxonomically relevant traits (adhesive tubes, protonephridia and sensorial bristles), failed to detect elements of the male system, thus stressing the parthenogenetic nature of the Brazilian species. Phylogenetic analysis, carried out with ML, MP and Bayesian approaches, yielded topologies with strong nodal support and highly congruent with each other. Among the supported groups is the previously undocume...Continue Reading

References

Jun 1, 1996·Molecular Biotechnology·R Staden
Aug 1, 1996·Computer Applications in the Biosciences : CABIOS·R D Page
Aug 13, 2003·Bioinformatics·Fredrik Ronquist, John P Huelsenbeck
May 10, 2007·Molecular Biology and Evolution·Koichiro TamuraSudhir Kumar
Jan 1, 2010·ZooKeys·André R S GarraffoniMaria Balsamo

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Citations

Sep 18, 2015·Biodiversity Data Journal·Maria BalsamoYde de Jong
Oct 23, 2019·PeerJ·Ariane Campos, André Rinaldo Senna Garraffoni
Feb 9, 2021·Hydrobiologia·Maria BalsamoNiels W L Van Steenkiste

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Methods Mentioned

BETA
electron microscopy
PCR

Software Mentioned

PLoS
MrModeltest
ZooBank
Mega
ClustalX
MrBayes

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