Data from: phylogenomics of the Neogastropoda: the backbone hidden in the bush

The molluscan order Neogastropoda encompasses over 15,000 almost
exclusively marine species playing important roles in benthic communities
and in the economics of coastal countries. Neogastropoda underwent
intensive cladogenesis in early stages of diversification, generating a
‘bush’ at the base of their evolutionary tree, that has been hard to
resolve even with high throughput molecular data. In the present study we
analyze a comprehensive exon capture dataset of 1,817 loci (79.6% data
occupancy), comprising 112 taxa of 48 (out of 60) recent Neogastropoda
families with a variety of phylogenetic inference methods to resolve their
relationships. Our results show consistent topologies and high support in
all analyses at (super)family level, supporting monophyly of Muricoidea,
Mitroidea, Conoidea, and, with some reservations, Olivoidea and
Buccinoidea. Volutoidea and Turbinelloidea as currently circumscribed are
clearly paraphyletic. Despite our analyses consistently resolve most
backbone nodes, three prove problematic. First, uncertain placement of
Cancellariidae, as a sister group of either a Ficoidea-Tonnoidea clade, or
of the rest of Neogastropoda, leaves monophyly of Neogastropoda
unresolved. Second, relationships are contradictory at the base of the
major grouping the ‘core Neogastropoda’. Third, coalescence-based analyses
reject monophyly of the Buccinoidea in relation to Vasidae. We analysed
loci phylogenetic signal in relation with potential biases, and propose
most probable resolutions in the two latter recalcitrant nodes. The
uncertain placement of Cancellariidae may be explained by orthology
violations due to the differential paralog loss short after the whole
genome duplication, and should be resolved with a curated set of longer
loci.