Data from: The Phylogeny of the Diploporita: a polyphyletic assemblage of blastozoan echinoderms

The phylogenetic relationships of Paleozoic blastozoan echinoderms are poorly understood and many of the traditionally ascribed groups are likely polyphyletic. Diploporitans, those blastozoans with double pore (diplopore) respiratory structures, have never been placed within a rigorous phylogenetic framework and their highly variable morphologies suggest that they do not represent a natural clade. A maximum parsimony phylogenetic analysis, spanning a wide range of diploporitan and related taxa, indicates that diplopore-bearing blastozoans are a polyphyletic grouping and, consequently, that diplopore respiratory structures have evolved more than once within the echinoderms. A constraint analyses indicate that a single diplopore-bearing clade bearing the traditionally defined Glyptosphaeritida, Sphaeronitida, Asteroblastida is less parsimonious than multiple diplopore-bearing clades inferred by the unconstrained analysis.Supplementary_SheffieldandSumrall_ExplanationofCharactersList of characters used in this analysis with explanations of character statesDataMatrix_SheffieldSumrall_DiploporitaCharacter codings for all specimens used in analysis. Explanations for each character can be found in .docx file within this Dryad repositorycomparision_Noconstraint_Family_templetonCoding for Templeton test comparing forced monophyletic groupings of families within Diploporita against no constraints.Comparison_noConstraint_Diploporita_TempletonCoding for Templeton test comparing forced monophyletic grouping of Diploporita versus no constraintsFunding provided by: National Science FoundationCrossref Funder Registry ID: http://dx.doi.org/10.13039/100000001Award Number: DEB-103626