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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.
Phylogenies without roots? A plea for the use of vouchers in molecular phylogenetic studies.
Investigation of molluscan phylogeny using large-subunit and small-subunit nuclear rRNA sequences.
A soft-bodied mollusc with radula from the Middle Cambrian Burgess Shale
Odontogriphus omalus is interpreted to be members of an early stem-group mollusc lineage that probably originated in the Neoproterozoic Ediacaran Period, providing support for the retention of a biomat-based grazing community from the late Precambrian Period until at least the Middle Cambrian.
What can biological barcoding do for marine biology?
It is argued that barcodes are potentially extremely useful tools for taxonomy for several reasons and would provide tools for higher taxonomic resolution of disparate life forms in cases when morphology is ambiguous or uninformative.
Local scale DNA barcoding of bivalves (Mollusca): a case study
The insufficiency of blast searches in GenBank to assign many of the obtained sequences to correct phylum was noted and clearly demonstrates the need for better search strategies specifically targeted at identification using DNA barcodes.
Phylogenetic taxonomy–some comments
Some of the practical issues in a phylogenetic taxonomy are focused on, and some alternative solutions to problems acknowledged in previous papers are suggested.
Molecular Phylogeny of the Model Annelid Ophryotrocha
- T. Dahlgren, B. Åkesson, C. Schander, K. Halanych, P. Sundberg
- BiologyThe Biological Bulletin
- 1 October 2001
This study uses 16S mitochondrial gene sequence data to infer the phylogeny of Ophryotrocha strains commonly used in the laboratory and shows that sequential hermaphroditism evolved from a simultaneous hermphroditic ancestor, and that characters previously used in phylogenetic reconstruction are homoplasic within the group.
Molecular taxonomy and phylogeny of the Geodiidae (Porifera, Demospongiae, Astrophorida) – combining phylogenetic and Linnaean classification
A molecular taxonomy and phylogeny of the Geodiidae (Porifera, Demospongiae, Astrophorida) – combining phylogenetic and Linnaean classification is presented.
DNA, PCR and formalinized animal tissue - a short review and protocols
The conditions under which obtaining relatively high-quality DNA from formaldehyde-fixed material is possible are examined, making previously collected samples accessible for molecular studies in genetics, systematics and related fields.