REANALYSIS OF THE RELATIONSHIPS AMONG THE CIRRIPEDIA AND THE ASCOTHORACIDA AND THE PHYLOGENETIC POSITION OF THE FACETOTECTA (MAXILLOPODA: THECOSTRACA) USING 18S rDNA SEQUENCES

Pérez‐Losada, Marcos; Høeg, Jens T.; Kolbasov, Gregory A.; Crandall, Keith A.

doi:10.1651/0278-0372(2002)022[0661:rotrat]2.0.co;2

Cited by 22 publications

(20 citation statements)

References 33 publications

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“…Our larval data agree with a monophyletic Thoracica, including both Ibla and Paralepas, as has also been suggested in most previous analyses (e.g., Newman 1987Newman , 1996, but until recently not rigorously tested (Mizrahi et al, 1998;Pérez-Losada et al, 2002Blin et al, 2004). With both Ibla and Paralepas placed above the RhizocephalaThoracica node there are no extant taxa to provide information on the ground patterns for the Acrothoracica and Rhizocephala.…”

Section: Conclusion and Sexual Systemssupporting

confidence: 91%

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Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Høeg

Achituv

Chan

et al. 2008

Journal of Morphology

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We used scanning electron microscopy (SEM) to describe cypris morphology in species of the barnacles Ibla and Paralepas, both of which are pivotal in understanding cirripede evolution. In Ibla, we also studied late naupliar stages with video and SEM. Special emphasis was put on the lattice organs, the antennules and the thorax and telson. In Paralepas we had settled specimens only and could therefore only investigate the carapace with the lattice organs. Cyprids of Ibla quadrivalvis and Paralepas dannevigi have five sets of lattice organs, grouped as two anterior and three posterior pairs. The organs are of the pore-field type and the terminal pore is situated anteriorly in the first pair, just as in the Rhizocephala and the Thoracica. In Ibla the armament of antennular sensilla resembles that found in the Thoracica but differs from the Rhizocephala. The absence of setules on the A and B setae sited terminally on the fourth antennular segment is a similarity with the Acrothoracica. The attachment disc is angled rather than facing distally and is encircled by a low cuticular velum. The thoracopods have two-segmented endopods and exopods as in the Thoracica, but the number, shape, and position of thoracopodal setae differ somewhat from other species of that superorder. Both Ibla and Paralepas cyprids have a deeply cleaved telson, but no independent abdominal part. In cypris morphology, Ibla and Paralepas show several synapomorphies with the clade comprising Rhizocephala and Thoracica and there are no specific apomorphies with either the Acrothoracica, the Rhizocephala or any particular subgroup within the Thoracica. This is in agreement with recent molecular evidence that Ibla (Ibliformes) is the sister taxon to all other Thoracica and the ibliforms therefore become the outgroup of choice for studying character evolution within the superorder. Paralepas, and other pedunculated barnacles without shell plates, are apparently not primitive but are secondarily evolved and nested within the Thoracica.

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Section: Conclusion and Sexual Systemssupporting

confidence: 91%

“…On the basis of molecular and morphological (mainly larval) evidence Pérez-Losada et al 2002Blin et al, 2004), we now have a robust gross phylogeny of the Crustacea Thecostraca (see Fig. 9).…”

Section: Phylogenymentioning

confidence: 78%

Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Høeg

Achituv

Chan

et al. 2008

Journal of Morphology

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“…Using maximum likelihood methods and adding more outgroup sequences, Pérez-Losada et al . [58] could show that this monophylum disappears. They point out that the additional outgroup sequences enable the recovery of the correct tree even with the maximum parsimony optimality criterion.…”

Section: Resultsmentioning

confidence: 99%

Visualizing differences in phylogenetic information content of alignments and distinction of three classes of long-branch effects

2007

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“…Therefore, we tested different strategies with respect to their capabilities to ameliorate the effect of the symplesiomorphy trap given a limited taxon sampling. In the Cirripedia example, using appropriate methods such as ML and increased outgroup sampling ameliorated the symplesiomorphy problem because this misplacement was due to long branches [66]. In the Mammalia example, the problem could be solved by the RY coding strategy and partitioned analyses, which resulted in weak support for the Theria hypothesis even using mitochondrial data [15].…”

Section: Discussionmentioning

confidence: 99%

Detecting the symplesiomorphy trap: a multigene phylogenetic analysis of terebelliform annelids

et al. 2011

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BackgroundFor phylogenetic reconstructions, conflict in signal is a potential problem for tree reconstruction. For instance, molecular data from different cellular components, such as the mitochondrion and nucleus, may be inconsistent with each other. Mammalian studies provide one such case of conflict where mitochondrial data, which display compositional biases, support the Marsupionta hypothesis, but nuclear data confirm the Theria hypothesis. Most observations of compositional biases in tree reconstruction have focused on lineages with different composition than the majority of the lineages under analysis. However in some situations, the position of taxa that lack compositional bias may be influenced rather than the position of taxa that possess compositional bias. This situation is due to apparent symplesiomorphic characters and known as "the symplesiomorphy trap".ResultsHerein, we report an example of the sympleisomorphy trap and how to detect it. Worms within Terebelliformia (sensu Rouse & Pleijel 2001) are mainly tube-dwelling annelids comprising five 'families': Alvinellidae, Ampharetidae, Terebellidae, Trichobranchidae and Pectinariidae. Using mitochondrial genomic data, as well as data from the nuclear 18S, 28S rDNA and elongation factor-1α genes, we revealed incongruence between mitochondrial and nuclear data regarding the placement of Trichobranchidae. Mitochondrial data favored a sister relationship between Terebellidae and Trichobranchidae, but nuclear data placed Trichobranchidae as sister to an Ampharetidae/Alvinellidae clade. Both positions have been proposed based on morphological data.ConclusionsOur investigation revealed that mitochondrial data of Ampharetidae and Alvinellidae exhibited strong compositional biases. However, these biases resulted in a misplacement of Trichobranchidae, rather than Alvinellidae and Ampharetidae. Herein, we document that Trichobranchidae was apparently caught in the symplesiomorphy trap suggesting that in certain situations even homologies can be misleading.

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REANALYSIS OF THE RELATIONSHIPS AMONG THE CIRRIPEDIA AND THE ASCOTHORACIDA AND THE PHYLOGENETIC POSITION OF THE FACETOTECTA (MAXILLOPODA: THECOSTRACA) USING 18S rDNA SEQUENCES

Cited by 22 publications

References 33 publications

Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

Visualizing differences in phylogenetic information content of alignments and distinction of three classes of long-branch effects

Detecting the symplesiomorphy trap: a multigene phylogenetic analysis of terebelliform annelids

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