Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Echinobase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
Echinobase
ECB-ART-49624
Mol Biol Evol 2021 Jan 23;382:686-701. doi: 10.1093/molbev/msaa228.
Show Gene links Show Anatomy links

Phylogenomic Resolution of Sea Spider Diversification through Integration of Multiple Data Classes.

Ballesteros JA , Setton EVW , Santibáñez-López CE , Arango CP , Brenneis G , Brix S , Corbett KF , Cano-Sánchez E , Dandouch M , Dilly GF , Eleaume MP , Gainett G , Gallut C , McAtee S , McIntyre L , Moran AL , Moran R , López-González PJ , Scholtz G , Williamson C , Woods HA , Zehms JT , Wheeler WC , Sharma PP .


Abstract
Despite significant advances in invertebrate phylogenomics over the past decade, the higher-level phylogeny of Pycnogonida (sea spiders) remains elusive. Due to the inaccessibility of some small-bodied lineages, few phylogenetic studies have sampled all sea spider families. Previous efforts based on a handful of genes have yielded unstable tree topologies. Here, we inferred the relationships of 89 sea spider species using targeted capture of the mitochondrial genome, 56 conserved exons, 101 ultraconserved elements, and 3 nuclear ribosomal genes. We inferred molecular divergence times by integrating morphological data for fossil species to calibrate 15 nodes in the arthropod tree of life. This integration of data classes resolved the basal topology of sea spiders with high support. The enigmatic family Austrodecidae was resolved as the sister group to the remaining Pycnogonida and the small-bodied family Rhynchothoracidae as the sister group of the robust-bodied family Pycnogonidae. Molecular divergence time estimation recovered a basal divergence of crown group sea spiders in the Ordovician. Comparison of diversification dynamics with other marine invertebrate taxa that originated in the Paleozoic suggests that sea spiders and some crustacean groups exhibit resilience to mass extinction episodes, relative to mollusk and echinoderm lineages.

PubMed ID: 32915961
PMC ID: PMC7826184
Article link: Mol Biol Evol




Article Images: [+] show captions
References [+] :
Arabi, Studying sources of incongruence in arthropod molecular phylogenies: sea spiders (Pycnogonida) as a case study. 2010, Pubmed