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Aplacophoran Mollusks Evolved from Ancestors with Polyplacophoran-like Features
TLDR
It is argued that the simple body plan of recent aplacophorans is the result of simplification and does not represent a basal molluscan condition. Expand
Development of the nervous system in Solenogastres (Mollusca) reveals putative ancestral spiralian features
TLDR
The development of the nervous system in early solenogaster larvae shows striking similarities to other spiralians, especially polychaetes, in exhibiting an apical organ with flask-shaped cells, a single pair of longitudinal neurite bundles, a serotonin-LIR innervation of the prototroch, and formation of these structures from an anterior and a posterior neurogenic domain. Expand
Ancestral and novel roles of Pax family genes in mollusks
TLDR
Developmental expression of Pax2/5/8, Pax6, and the lophotrochozoan-specific Paxβ in the worm-shaped mollusk Wirenia argentea, a member of Aplacophora that together with Polyplacophile forms the Aculifera, suggests co-option in aculiferan skeletogenesis. Expand
Cell Proliferation Pattern and Twist Expression in an Aplacophoran Mollusk Argue Against Segmented Ancestry of Mollusca
TLDR
Cell proliferation patterns and the expression of the twist ortholog during larval development in solenogasters demonstrate the existence of extensive and long‐lived mesodermal bands in a worm‐shaped aculiferan, a situation which is similar to annelids but in stark contrast to conchiferans. Expand
Comparative transcriptomics enlarges the toolkit of known developmental genes in mollusks
TLDR
This study provides an important framework for understanding some of the underlying molecular mechanisms involved in molluscan body plan diversification and hints towards functions of key developmental genes in mollsuscan morphogenesis. Expand
From complex to simple: myogenesis in an aplacophoran mollusk reveals key traits in aculiferan evolution
TLDR
Postmetamorphic remodeling in W. argentea supports the hypothesis of a complex myoanatomy rather than a three-layered body wall musculature at the base of Aculifera, and argues against homology of the body wallMusculature of adult Neomeniomorpha and other potential molluscan sister groups. Expand
Brain regionalization genes are co-opted into shell field patterning in Mollusca
TLDR
All Gbx-orthologs and the other ‘posterior brain regionalization genes’ such as Pax2/5/8 and Hox1 are expressed in the mantle that secretes shell(s) and spicules of mollusks (except cephalopods). Expand
Expression of six3 and otx in Solenogastres (Mollusca) supports an ancestral role in bilaterian anterior‐posterior axis patterning
TLDR
Comparative analysis of six3 and otx expression in bilaterian argues for an ancestral function in anterior‐posterior body axis patterning but, due to its presence in animals lacking a head and/or a brain, not necessarily for the presence of these morphological structures in the last common ancestor (LCA) of bilaterians. Expand