Resolving Difficult Phylogenetic Questions: Why More Sequences Are Not Enough
Three recent large-scale phylogenomics studies, which deal with the early diversification of animals, produced highly incongruent findings despite the use of considerable sequence data, suggesting that merely adding more sequences is not enough to resolve the inconsistencies.
Phylogenomics Revives Traditional Views on Deep Animal Relationships
Slow mitochondrial DNA sequence evolution in the Anthozoa (Cnidaria)
Slow evolution and unique characteristics may be common in primitive metazoans, suggesting that patterns of mtDNA evolution in these organisms differ from that in other animal systems.
Oxygen isotope fractionation in marine aragonite of coralline sponges
Improved Phylogenomic Taxon Sampling Noticeably Affects Nonbilaterian Relationships
This work recovers monophyletic Porifera as the sister group to all other Metazoa and suggests that the basal position of the fast-evolving Ctenophora proposed by Dunn et al. was due to LBA and that broad taxon sampling is of fundamental importance to metazoan phylogenomic analyses.
Deep metazoan phylogeny: when different genes tell different stories.
Calcium isotope fractionation in calcite and aragonite
Low variation in partial cytochrome oxidase subunit I (COI) mitochondrial sequences in the coralline demosponge Astrosclera willeyana across the Indo-Pacific
- G. Wörheide
- 1 March 2006
COI data presented here do not support the hypothesis of at least two sibling species belonging to genus Astrosclera in the Pacific, and add to the growing evidence of a general mtDNA conservation in sponges.
Genomic data do not support comb jellies as the sister group to all other animals
- D. Pisani, W. Pett, G. Wörheide
- BiologyProceedings of the National Academy of Sciences
- 30 November 2015
It is concluded that the alternative scenario of animal evolution according to which ctenophores evolved morphological complexity independently from cnidarians and bilaterians or, alternatively, sponges secondarily lost a nervous system, muscles, and other characters, is not supported by the available evidence.
Independent evolution of striated muscles in cnidarians and bilaterians
It is shown that a muscle protein core set, including a type II myosin heavy chain (MyHC) motor protein characteristic of striated muscles in vertebrates, was already present in unicellular organisms before the origin of multicellular animals.