ArticleBMC evolutionary biology2015
From complex to simple: myogenesis in an aplacophoran mollusk reveals key traits in aculiferan evolution.
Article in BMC evolutionary biology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed.
- Rare Evolutionary Events Support the Phylogenetic Placement of Orthonectida Within Annelida.International journal of molecular sciences · 2025Article
- HES and Mox genes are expressed during early mesoderm formation in a mollusk with putative ancestral features.Scientific reports · 2021Article
- A mitogenomic phylogeny of chitons (Mollusca: Polyplacophora).BMC evolutionary biology · 2020Article
- Phylogenomics of Aplacophora (Mollusca, Aculifera) and a solenogaster without a foot.Proceedings. Biological sciences · 2019Article
- The evolution of molluscs.Biological reviews of the Cambridge Philosophical Society · 2019Article
- Towards a ground pattern reconstruction of bivalve nervous systems: neurogenesis in the zebra musselOrganisms, diversity & evolution · 2018Article
- Cell lineage and cell cycling analyses of the 4d micromere using live imaging in the marine annelideLife · 2017Article
- Brain regionalization genes are co-opted into shell field patterning in Mollusca.Scientific reports · 2017Article
- Ancestral and novel roles of Pax family genes in mollusks.BMC evolutionary biology · 2017Article
- Cell Proliferation Pattern and Twist Expression in an Aplacophoran Mollusk Argue Against Segmented Ancestry of Mollusca.Journal of experimental zoology. Part B, Molecular and developmental evolution · 2016Article
- Inferring muscular ground patterns in Bivalvia: Myogenesis in the scallop Nodipecten nodosus.Frontiers in zoology · 2015Article
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5 authors.
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Abstract
backgroundRecent studies suggest a bifurcation at the base of Mollusca, resulting in the primarily single-shelled Conchifera (Bivalvia, Gastropoda, Scaphopoda, Monoplacophora, Cephalopoda) and the spicule-bearing Aculifera (Polyplacophora, Neomeniomorpha, Chaetodermomorpha). A recent study revealed a complex larval musculature exclusively shared by Neomeniomorpha and Polyplacophora, supporting a close relationship of both taxa. However, the ontogenetic transition from the complex larval to the simple adult neomeniomorph musculature, which mainly consists of a three-layered body-wall musculature and serially iterated dorsoventral muscles, remains unknown. To close this gap in knowledge, we studied remodeling of the larval musculature during metamorphosis in the neomeniomorph Wirenia argentea. A comparative analysis with a novel data set of a polyplacophoran, Leptochiton asellus, allows us to infer the morphology of the last common ancestor of Aculifera and the evolution of its subclades therefrom.
resultsThe complex larval musculature of Wirenia argentea persists through metamorphosis and becomes modified to form two of the three muscle layers of the adult body wall. The innermost longitudinal layer of the three-layered body wall musculature is generated by transformation and expansion of distinct larval longitudinal muscle bundles. The larval ventrolateral muscle strands are remodeled and eventually become the most ventral part of the adult longitudinal layer of the body wall musculature. The paired larval enrolling muscle forms the lateral parts and the former rectus muscle is destined to become the most dorsal part of the longitudinal layer of the body wall musculature. The transient ventromedian muscle is lost during postmetamorphic development.
conclusionsPostmetamorphic 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 thus argues against homology of the body wall musculature of adult Neomeniomorpha and other potential molluscan sister groups. Our data show that the neomeniomorph body wall musculature is a derived condition and not an aculiferan or molluscan plesiomorphy.
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