Phylogenomics reveals deep molluscan relationships
This work uses transcriptome and genome data from all major lineages (except Monoplacophora) and recovers a well-supported topology for Mollusca to propose the node-based name Pleistomolluscan, which strongly support the Aculifera hypothesis and finds support for advanced cephalization and shells as possibly having multiple origins within Mollsusca.
Phylogenomics of Lophotrochozoa with Consideration of Systematic Error
Although the analyses do not unambiguously resolve lophotrochozoan phylogeny, they advance the field by reducing the list of viable hypotheses and can be applied to explore sources of incongruence and poor support in any phylogenomic data set.
Fast evolving 18S rRNA sequences from Solenogastres (Mollusca) resist standard PCR amplification and give new insights into mollusk substitution rate heterogeneity
The extreme morphological diversity of mollusks is mirrored in the molecular 18S data and shows elevated substitution rates mainly in three higher taxa: true limpets, Cephalopoda and Solenogastres and the phylogenetic tree based on 123 species shows limited resolution at the class level but illustrates the pitfalls of artificial groupings formed due to shared biased sequence composition.
Comparative neuroanatomy suggests repeated reduction of neuroarchitectural complexity in Annelida
It is concluded that the apparent homology of mushroom bodies in distantly related groups has to be interpreted as a plesiomorphy, pointing towards a considerably complex neuroarchitecture inherited from the last common ancestor, Urbilateria.
Foregut glands of Solenogastres (Mollusca): Anatomy and revised terminology
The results of recent investigations are added to earlier ones, and a classification system for these multicellular glands is proposed, and the importance of ventrolateral foregut gland characters for phylogenetic considerations within the Solenogastres is discussed.
The complete mitochondrial genome of Scutopus ventrolineatus (Mollusca: Chaetodermomorpha) supports the Aculifera hypothesis
- David Osca, Iker Irisarri, C. Todt, C. Grande, R. Zardoya
- BiologyBMC Evolutionary Biology
- 25 September 2014
Phylogenetic analyses of mitochondrial sequences showed strong among-lineage rate heterogeneity that produced long-branch attraction biases and the reconstructed phylogenetic tree based on combined mitochondrial and nuclear sequence data recovered monophyletic Aplacophora, Aculifera, and Conchifera.
Aplacophoran Mollusks Evolved from Ancestors with Polyplacophoran-like Features
New species of the genus Isorropodon (Bivalvia: Vesicomyidae: Pliocardiinae) from cold methane seeps at Nyegga (Norwegian Sea, Vøring Plateau, Storrega Slide)
- E. Krylova, A. Gebruk, D. Portnova, C. Todt, H. Haflidason
- BiologyJournal of the Marine Biological Association of…
- 19 April 2011
A new species of vesicomyid bivalve is described based on shell morphology, from the Nyegga cold methane seep area on the Norwegian continental margin, the northernmost record of recent representatives of the family Vesicomyidae.
Comparative neuroanatomy of Caudofoveata, Solenogastres, Polyplacophora, and Scaphopoda (Mollusca) and its phylogenetic implications
- Simone Faller, B. H. Rothe, C. Todt, A. Schmidt-Rhaesa, R. Loesel
- 16 February 2012
An immunohistochemical survey is initiated to contribute new neuroanatomical data for several molluscan taxa, especially the lesser known Caudofoveata, Solenogastres, Polyplacophora, and Scaphopoda, focusing on the cellular architecture and distribution of neurotransmitters in the brain.
Aplacophoran Mollusks—Still Obscure and Difficult?*
- C. Todt
- 15 February 2013
The results point to a sistergroup relationship between Solenogastres and Caudofoveata, but also show that there are a number of crucial differences that support a classification into two separate classes.