Are homalozoans echinoderms? An answer from the extraxial-axial theory

By B. David, B. Lefebvre, R. Mooi, R. Parsley. Paleobiology, 2000

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Skeletal homologies, phylogeny and classification of the earliest asterozoan echinoderms (2005, unknown): “extraxial sensu Mooi et al. (1994).”
The pre‐radial history of echinoderms (2005, methodology): “Under the echinoderm model of Ubaghs (1968b), Jefferies et al. (1996) and David et al. (2000), these grooves housed a water vascular system.”
Constraints on the timescale of animal evolutionary history (2015, background): “The affinity of Stromatocystites, probable sister group to all other edrioasteroids, is also contentious, with some identifying it as a stem-echinoderm (David et al., 2000).”
Phylogenetic taxonomy and classification of the Crinoidea (Echinodermata) (2017, background): “One hypothesis of crinoid origins postulates that crinoids and blastozoan echinoderms independently evolved pelmatozoan-grade body plans (e.g., Sprinkle, 1973, 1976; Mooi and David, 1998, 2008; David et al., 2000; Guensburg and Sprinkle, 2003; Guensburg, 2012).”