Molecular systematics of the Acoela (Acoelomorpha, Platyhelminthes) and its concordance with morphology.

@article{Hooge2002MolecularSO,
  title={Molecular systematics of the Acoela (Acoelomorpha, Platyhelminthes) and its concordance with morphology.},
  author={Matthew D. Hooge and Pilar A. Haye and Seth D. Tyler and Marian K. Litvaitis and Irving L. Kornfield},
  journal={Molecular phylogenetics and evolution},
  year={2002},
  volume={24 2},
  pages={
          333-42
        }
}
The phylogenetic relationships of the lower worm group Acoela were investigated using newly obtained nuclear 18S rDNA sequences from 16 acoels in combination with 16 acoel sequences available on GenBank from other laboratories. Parsimony and maximum likelihood analyses of the molecular data supported the concept that the Acoela is monophyletic; however, the gene tree produced by these analyses conflicts with the current taxonomic system for the Acoela in several family-level groupings. Most… 
Concordance of molecular and morphological data: The example of the Acoela.
TLDR
Gene trees are discordant with traditional systematic schemes but strongly concordant with new morphological characteristics obtained through the use of transmission electron microscopy and confocal laser scanning microscopy, namely, characteristics of body-wall and copulatory organ musculature, sperm, sperm ducts, sagittocysts, and immunocytochemistry of the nervous system.
Systematics of Chaetognatha under the light of molecular data, using duplicated ribosomal 18S DNA sequences.
TLDR
The phylogenetic relationships of the chaetognaths were investigated using newly obtained small subunit ribosomal RNA nuclear 18S (SSU rRNA) sequences from 16 species together with 3 sequences available in GenBank, showing two classes of Chaetognatha SSU r RNA gene can be identified, suggesting a duplication of the whole ribosome cluster.
How the worm got its pharynx: phylogeny, classification and Bayesian assessment of character evolution in Acoela.
TLDR
A phylogenetic classification of Acoela down to the family level where six previous family level taxa are synonymized and Diopisthoporidae is the sister group to all other acoels and has the highest posterior similarity to the root.
Molecular insights into Cumacean family relationships (Crustacea, Cumacea).
TLDR
Comparison of the molecular phylogeny with that based on morphology suggests that many "diagnostic" characters are homoplasious, and results strongly suggest that families lacking an articulated telson form a monophyletic group.
A new viviparous acoel Childia vivipara sp. nov. with observations on the developing embryos, sperm ultrastructure, body wall and stylet musculatures
TLDR
It is shown that most of the classical morphological characters used in acoel taxonomy, obtained using traditional histological methods, may be misleading in identifying monophyletic entities within the Acoela.
A Flatworm from the Genus Waminoa (Acoela: Convolutidae) Associated with Bleached Corals in Western Australia
TLDR
This flatworm isolated from bleached colonies of the coral Coscinaraea marshae at Rottnest Island, Western Australia is described using a combination of morphological and molecular systematics and contributes to the understanding of the diversity and evolutionary relationship of the Acoela.
Molecular phylogeny of the Platyhelminthes
TLDR
Phylum-wide analyses based on complete ribosomal and other nuclear genes addressed to answer the main issues facing systematics and phylogeny of Platyhelminthes are reviewed.
The Hox gene complement of acoel flatworms, a basal bilaterian clade
TLDR
The Hox gene complement of the acoel flatworms is examined and similar gene sets found in two distantly related acoels suggest that this reduced gene complement may be ancestral in the acOels and that the aceels may have diverged from other bilaterian animals before elaboration of the 8‐ to 10‐gene Hox cluster that characterizes most bilaterians.
Ultrastructure of sperms in Acoela (Acoelomorpha) and its concordance with molecular systematics
TLDR
Characters of sperm morphology generally support the molecular hypothesis of relationships and confirm a suspected polyphyly of the families Convolutidae, Otocelididae, and Actinoposthiidae.
Cleavage in Nemertoderma westbladi (Nemertodermatida) and its phylogenetic significance
TLDR
The early embryonic cleavage in Nemertoderma westbladi is studied to provide the first account of nemertodermatid early development and the optimization of the cleavage pattern on current phylogenetic hypotheses with Nemertodmatida and Acoela as early bilaterian branches is discussed.
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