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• W2171877867 abstract "SUMMARY The reconstruction of ancestors is a central aim of comparative anatomy and evolutionary developmental biology, not least in attempts to understand the relationship between developmental and organismal evolution. Inferences based on living taxa can and should be tested against the fossil record, which provides an independent and direct view onto historical character combinations. Here, we consider the nature of the last common ancestor of living ecdysozoans through a detailed analysis of palaeoscolecids, an early and extinct group of introvert‐bearing worms that have been proposed to be ancestral ecdysozoans. In a review of palaeoscolecid anatomy, including newly resolved details of the internal and external cuticle structure, we identify specific characters shared with various living nematoid and scalidophoran worms, but not with panarthropods. Considered within a formal cladistic context, these characters provide most overall support for a stem‐priapulid affinity, meaning that palaeoscolecids are far‐removed from the ecdysozoan ancestor. We conclude that previous interpretations in which palaeoscolecids occupy a deeper position in the ecdysozoan tree lack particular morphological support and rely instead on a paucity of preserved characters. This bears out a more general point that fossil taxa may appear plesiomorphic merely because they preserve only plesiomorphies, rather than the mélange of primitive and derived characters anticipated of organisms properly allocated to a position deep within animal phylogeny." @default.
• W2171877867 created "2016-06-24" @default.
• W2171877867 creator A5000875445 @default.
• W2171877867 creator A5023764195 @default.
• W2171877867 creator A5080454473 @default.
• W2171877867 date "2010-03-01" @default.
• W2171877867 modified "2023-10-17" @default.
• W2171877867 title "Are palaeoscolecids ancestral ecdysozoans?" @default.
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• W2171877867 doi "https://doi.org/10.1111/j.1525-142x.2010.00403.x" @default.
• W2171877867 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20433458" @default.
• W2171877867 hasPublicationYear "2010" @default.
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