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Phylogenomic Analysis of a Putative Missing Link Sparks Reinterpretation of Leech Evolution

Artikel i vetenskaplig tidskrift
Författare A. J. Phillips
A. Dornburg
K. L. Zapfe
F. E. Anderson
S. W. James
Christer Erséus
E. M. Lemmon
A. R. Lemmon
B. W. Williams
Publicerad i Genome Biology and Evolution
Volym 11
Nummer/häfte 7
Sidor 1712-1722
ISSN 1759-6653
Publiceringsår 2019
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 1712-1722
Språk en
Länkar dx.doi.org/10.1093/gbe/evz120
Ämnesord Acanthobdella, anchored hybrid enrichment, Hirudinida, phylogeny, symbiosis, sanguivory, anchored hybrid enrichment, ultraconserved elements, molecular, phylogeny, data sets, 18s rdna, clitellata, annelida, hirudinea, origin, gene, Evolutionary Biology, Genetics & Heredity
Ämneskategorier Evolutionsbiologi, Genetik

Sammanfattning

Leeches (Hirudinida) comprise a charismatic, yet often maligned group of organisms. Despite their ecological, economic, and medical importance, a general consensus on the phylogenetic relationships of major hirudinidan lineages is lacking. This absence of a consistent, robust phylogeny of early-diverging lineages has hindered our understanding of the underlying processes that enabled evolutionary diversification of this clade. Here, we used an anchored hybrid enrichment-based phylogenomic approach, capturing hundreds of loci to investigate phylogenetic relationships among major hirudinidan lineages and their closest living relatives. Our results suggest that a dramatic reinterpretation of early leech evolution is warranted. We recovered Branchiobdellida as sister to a clade that includes all major lineages of hirudinidans, but found Acanthobdella to be nested within Oceanobdelliformes. These results cast doubt on the utility of Acanthobdella as a "missing link" used to explain the origin of blood-feeding in hirudineans. Further, our results support a deep divergence between predominantly marine and freshwater lineages, while not supporting the reciprocal monophyly of jawed and proboscis-bearing leeches. To sum up, our phylogenomic resolution of early-diverging leeches provides a necessary foundation for illuminating the evolution of host-symbiont associations and key adaptations that have allowed leeches to colonize a wide diversity of habitats worldwide.

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