Mitochondrial protein phylogeny joins myriapods with chelicerates

Hwang, Ui Wook; Friedrich, Markus; Tautz, Diethard; Park, Chan Jong; Kim, Won

doi:10.1038/35093090

Cited by 276 publications

(136 citation statements)

References 28 publications

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“…However, studies from the field of molecular phylogeny (recent contributions, e.g., Shultz and Regier, 2000;Cook et al, 2001;Friedrich and Tautz, 2001;Hwang et al, 2001;Peterson and Eernisse, 2001;Regier and Shultz, 2001;Pisani et al, 2004) as well as morphological studies on the architecture of the nervous system recently have provided evidence for a close relationship of Hexapoda and Crustacea (reviews, e.g., Strausfeld, 1998Strausfeld, , 2005Schram and Koenemann, 2004;Harzsch et al, 2005a;Harzsch, 2006). The name "Tetraconata" has been suggested for a taxon that embraces the hexapods and crustaceans (Dohle, 2001;Richter, 2002) in reference to the tetrapartite crystalline cone in the ommatidia as a synapomorphy of these groups.…”

Section: Comparison To Eye Growth In Drosophila Melanogaster and Evolmentioning

confidence: 99%

Evolution of arthropod visual systems: Development of the eyes and central visual pathways in the horseshoe crabLimulus polyphemusLinnaeus, 1758 (Chelicerata, Xiphosura)

Harzsch

Vilpoux

Blackburn

et al. 2006

Developmental Dynamics

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Despite ongoing interest into the architecture, biochemistry, and physiology of the visual systems of the xiphosuran Limulus polyphemus, their ontogenetic aspects have received little attention. Thus, we explored the development of the lateral eyes and associated neuropils in late embryos and larvae of these animals. The first external evidence of the lateral eyes was the appearance of white pigment spots-guanophores associated with the rudimentary photoreceptors-on the dorsolateral side of the late embryos, suggesting that these embryos can perceive light. The first brown pigment emerges in the eyes during the last (third) embryonic molt to the trilobite stage. However, ommatidia develop from this field of pigment toward the end of the larval trilobite stage so that the young larvae at hatching do not have object recognition. Double staining with the proliferation marker bromodeoxyuridine (BrdU) and an antibody against L. polyphemus myosin III, which is concentrated in photoreceptors of this species, confirmed previous reports that, in the trilobite larvae, new cellular material is added to the eye field from an anteriorly located proliferation zone. Pulse-chase experiments indicated that these new cells differentiate into new ommatidia. Examining larval eyes labeled for opsin showed that the new ommatidia become organized into irregular rows that give the eye field a triangular appearance. Within the eye field, the ommatidia are arranged in an imperfect hexagonal array. Myosin III immunoreactivity in trilobite larvae also revealed the architecture of the central visual pathways associated with the median eye complex and the lateral eyes. Double labeling with myosin III and BrdU showed that neurogenesis persists in the larval brain and suggested that new neurons of both the lamina and the medulla originate from a single common proliferation zone. These data are compared with eye development in Drosophila melanogaster and are discussed with regard to new ideas on eye evolution in the Euarthropoda. Developmental Dynamics 235:2641-2655, 2006.

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Section: Comparison To Eye Growth In Drosophila Melanogaster and Evolmentioning

confidence: 99%

Evolution of arthropod visual systems: Development of the eyes and central visual pathways in the horseshoe crabLimulus polyphemusLinnaeus, 1758 (Chelicerata, Xiphosura)

Harzsch

Vilpoux

Blackburn

et al. 2006

Developmental Dynamics

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“…The support for the monophyly of Crustacea plus Hexapoda, which came most emphatically from the evidence of a shared mitochondrial genome rearrangement, has been bolstered by numerous subsequent molecular phylogenetic analyses (Friedrich & Tautz 1995;Hwang et al 2001;Delsuc et al 2003;Nardi et al 2003;Regier et al 2005). Consideration of various aspects of morphology, in particular of nervous system ontogeny and structure, gives further weight to the integrity of this clade.…”

Section: The Position Of the Hexapoda Within The Pancrustaceamentioning

confidence: 99%

The evolution of the Ecdysozoa

Telford

Bourlat

Economou

et al. 2008

Phil. Trans. R. Soc. B

190

121

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Ecdysozoa is a clade composed of eight phyla: the arthropods, tardigrades and onychophorans that share segmentation and appendages and the nematodes, nematomorphs, priapulids, kinorhynchs and loriciferans, which are worms with an anterior proboscis or introvert. Ecdysozoa contains the vast majority of animal species and there is a great diversity of body plans among both living and fossil members. The monophyly of the clade has been called into question by some workers based on analyses of whole genome datasets. We review the evidence that now conclusively supports the unique origin of these phyla. Relationships within Ecdysozoa are also controversial and we discuss the molecular and morphological evidence for a number of monophyletic groups within this superphylum.

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“…However, some issues of euarthropod relationships are still controversial; for example the question as to whether insects, crustaceans, and myriapods form a monophyletic group, the Mandibulata, or whether myriapods group with the chelicerates to form the Myriochelata (4)(5)(6)(7)(8)(9). Most phylogenies support the Mandibulata, however, and evidence is based both on molecular and morphological characters.…”

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confidence: 99%

Expression patterns of neural genes in Euperipatoides kanangrensis suggest divergent evolution of onychophoran and euarthropod neurogenesis

Eriksson

Stollewerk

2010

Proc. Natl. Acad. Sci. U.S.A.

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One of the controversial debates on euarthropod relationships centers on the question as to whether insects, crustaceans, and myriapods (Mandibulata) share a common ancestor or whether myriapods group with the chelicerates (Myriochelata). The debate was stimulated recently by studies in chelicerates and myriapods that show that neural precursor groups (NPGs) segregate from the neuroectoderm generating the nervous system, whereas in insects and crustaceans the nervous tissue is produced by stem cells. Do the shared neural characters of myriapods and chelicerates represent derived characters that support the Myriochelata grouping? Or do they rather reflect the ancestral pattern? Analyses of neurogenesis in a group closely related to euarthropods, the onychophorans, show that, similar to insects and crustaceans, single neural precursors are formed in the neuroectoderm, potentially supporting the Myriochelata hypothesis. Here we show that the nature and the selection of onychophoran neural precursors are distinct from euarthropods. The onychophoran nervous system is generated by the massive irregular segregation of single neural precursors, contrasting with the limited number and stereotyped arrangement of NPGs/stem cells in euarthropods. Furthermore, neural genes do not show the spatiotemporal pattern that sets up the precise position of neural precursors as in euarthropods. We conclude that neurogenesis in onychophorans largely does not reflect the ancestral pattern of euarthropod neurogenesis, but shows a mixture of derived characters and ancestral characters that have been modified in the euarthropod lineage. Based on these data and additional evidence, we suggest an evolutionary sequence of arthropod neurogenesis that is in line with the Mandibulata hypothesis.achaete-scute homologue | euarthropod phylogeny | Notch signaling

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Mitochondrial protein phylogeny joins myriapods with chelicerates

Cited by 276 publications

References 28 publications

Evolution of arthropod visual systems: Development of the eyes and central visual pathways in the horseshoe crabLimulus polyphemusLinnaeus, 1758 (Chelicerata, Xiphosura)

Evolution of arthropod visual systems: Development of the eyes and central visual pathways in the horseshoe crabLimulus polyphemusLinnaeus, 1758 (Chelicerata, Xiphosura)

The evolution of the Ecdysozoa

Expression patterns of neural genes in Euperipatoides kanangrensis suggest divergent evolution of onychophoran and euarthropod neurogenesis

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