The tempo and mode of barnacle evolution

Pérez‐Losada, Marcos; Harp, Margaret; Høeg, Jens T.; Achituv, Y.; Jones, Diana S.; Watanabe, Hiromi; Crandall, Keith A.

doi:10.1016/j.ympev.2007.10.004

Cited by 122 publications

(120 citation statements)

References 49 publications

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“…Recently, the combined analysis of Pérez-Losada et al (2008) put two naked species (Heteralepas, Paralepas) deep within the Thoracica, although not as a single clade, and the lattice organ morphology described here dovetails with this phylogenetic position. As also argued by Buckeridge and Newman (2006), this entails that these pedunculated species lost their shell plates secondarily and confer no information on the thoracican ground pattern.…”

Section: Paralepasmentioning

confidence: 55%

“…Subsequent analyses based on molecular datasets disagreed with respect to Ibla, which was either placed as nested within or at the base of the Thoracica. Recently, Pérez-Losada et al (2008) challenged several of the traditional hypotheses on thoracican evolution based on a phylogenetic analysis using both molecular and morphological character sets. A gradual increase in shell plates from four over five to many could not be confirmed, since both the naked heteralepadid forms and species with only five plates were nested within multiplated forms.…”

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confidence: 99%

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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: Paralepasmentioning

confidence: 55%

mentioning

confidence: 99%

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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“…Such an ancestor was already suggested by Glenner and Høeg ( 2002 ), but on a much weaker phylogenetic foundation. At present, the new embryological evidence stands in marked contrast to the very robust molecular data concerning rhizocephalan relationships (Pérez-Losada et al 2008 ).…”

Section: Early Developmentmentioning

confidence: 69%

“Crustacea”: Cirripedia

Høeg

Deutsch

Chan

et al. 2015

Evolutionary Developmental Biology of Invertebrates 4

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“…Barnacles are among the flagship taxa considered in the antiquity hypothesis, notably by Newman [18] based on fossil evidences. Recent phylogenetic results showed major problems in the taxonomy of barnacles notably at higher classification levels [48]. A recent phylogenetic analysis of vent barnacles moreover showed two, relatively recent, independent invasions of vent environments [49].…”

Section: -P5mentioning

confidence: 99%

Evolutionary origins of hydrothermal vents metazoans

Samadi

2015

BIO Web of Conferences

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Abstract. The discovery of the oases associated with hydrothermal vents in the deep sea, is probably the most fascinating discovery of oceanography of the last century. In this habitat, contrary to all expectations, a thriving development of unknown organisms was observed. At that time the knowledge about the deep sea organisms was very scarce and the accepted hypotheses about their evolutionary origins, their physiology or their ecology were very speculative. Almost forty years later, exploration of the deep-sea realm, but also of paleontological data together with the improvements in the phylogenetic methods, allowed the rejection of the hypothesis of an evolutionary history cut off the rest of the marine realm. Life in the deep sea: Knowledge is recentIn the thirty years after the discovery of the deep-sea oases associated with hot vents much of the research efforts of the marine biologists have been devoted to this exceptional environment and its inhabitants. However, when the hot vents have been discovered, the deep-sea realm was still poorly known. At this time, most of the available hypotheses about the functioning of deep sea ecosystems, or about the physiology or the evolutionary origins of the organisms were very speculative. In this historical context, I selected three hypotheses which I feel have played a major role in the analysis of the diversity of hot vents' organisms and their evolutionary origins.

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The tempo and mode of barnacle evolution

Cited by 122 publications

References 49 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

“Crustacea”: Cirripedia

Evolutionary origins of hydrothermal vents metazoans

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