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Phylogenomic analyses unravel annelid evolution

It is shown that phylogenomic analyses of 34 annelid taxa, using 47,953 amino acid positions, recovered a well-supported phylogeny with strong support for major splits and Ancestral character trait reconstructions indicate that these clades show adaptation to either an errant or a sedentary lifestyle.
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Illuminating the base of the annelid tree using transcriptomics.

This study based on transcriptomic data comprising 68,750-170,497 amino acid sites from 305 to 622 proteins resolves annelid relationships, including Chaetopteridae, Amphinomidae, Sipuncula, Oweniidae, and Magelonidae in the basal part of the tree.
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Phylogeny of Eunicida (Annelida) and exploring data congruence using a partition addition bootstrap alteration (PABA) approach.

The definition of both the labidognath and ctenognath jaw type does not address adequately the variation within Eunicida and thus misleads current evolutionary understanding, and a symmetric maxillary apparatus with a carrier and four to six maxillae is most likely the plesiomorphic condition for EunicIDA.
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Invertebrate neurophylogeny: suggested terms and definitions for a neuroanatomical glossary

The use of revised neuroanatomical terminology in any new descriptions of the anatomy of invertebrate nervous systems will improve the comparability of this organ system and its substructures between the various taxa, and finally even lead to better and more robust homology hypotheses.
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The Evolution of Annelids Reveals Two Adaptive Routes to the Interstitial Realm

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Ultrastructure of Nuchal Organs in Polychaetes (Annelida) — New Results and Review

The probability of a loss of the nuchal organs in Clitellata is higher, which favours the second hypothesis: that nunchal organs are part of the ground pattern of the Annelida and very likely are an autapomorphy of this group.
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The phylogenetic position of the Aeolosomatidae and Parergodrilidae, two enigmatic oligochaete‐like taxa of the ‘Polychaeta’, based on molecular data from 18S rDNA sequences

Con convergent evolution of clitellate-like characters in S. subterranea and hence in the Parergodrilidae is suggested by the phylogenetic analysis.
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Progenesis in Eunicida ("Polychaeta," Annelida)--separate evolutionary events? Evidence from molecular data.

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Anatomy and ultrastructure of the ventral pharyngeal organs of Saccocirrus(Saccocirridae) and Protodriloides(Protodriloidae fam. n.) with remarks on the phylogenetic relationships within the…

The results and data from previous studies are summarized in a tentative phylogenetic dendrogram and allow the introduction of a new family, Protodriloidae, which shows homologous similarities in their pharynges.
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Sense organs in polychaetes (Annelida)

Polychaetes possess a wide range of sensory structures. These form sense organs of several kinds, including the appendages of the head region (palps, antennae, tentacular cirri), the appendages of…
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