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Fixed, free, and fixed: The fickle phylogeny of extant Crinoidea (Echinodermata) and their Permian-Triassic origin
Rouse, Greg W.; Jermiin, Lars S.; Wilson, Nerida G. et al.
2012In Molecular Phylogenetics and Evolution, 66 ((1)), p. 161-181
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Keywords :
[en] Articulata, Molecular clock, Fossils, Transformations
Abstract :
[en] Although the status of Crinoidea (sea lilies and featherstars) as sister group to all other living echinoderms is well-established, relationships among crinoids, particularly extant forms, are debated. All living species are currently placed in Articulata, which is generally accepted as the only crinoid group to survive the Permian-Triassic extinction event. Recent classifications have recognized five major extant taxa: Isocrinida, Hyocrinida, Bourgueticrinina, Comatulidina and Cyrtocrinida, plus several smaller groups with uncertain taxonomic status, e.g., Guillecrinus, Proisocrinus and Caledonicrinus. Here we infer the phylogeny of extant Crinoidea using three mitochondrial genes and two nuclear genes from 59 crinoid terminals that span the majority of extant crinoid diversity. Although there is poor support for some of the more basal nodes, and some tree topologies varied with the data used and mode of analysis, we obtain several robust results. Cyrtocrinida, Hyocrinida, Isocrinida are all recovered as clades, but two stalked crinoid groups, Bourgueticrinina and Guillecrinina, nest among the featherstars, lending support to an argument that they are paedomorphic forms. Hence, they are reduced to families within Comatulida. Proisocrinus is clearly shown to be part of Isocrinida, and Caledonicrinus may not be a bourgueticrinid. Among comatulids, tree topologies show little congruence with current taxonomy, indicating that much systematic revision is required. Relaxed molecular clock analyses with eight fossil calibration points recover Articulata with a median date to the most recent common ancestor at 231-252mya in the Middle to Upper Triassic. These analyses tend to support the hypothesis that the group is a radiation from a small clade that passed through the Permian-Triassic extinction event rather than several lineages that survived. Our tree topologies show various scenarios for the evolution of stalks and cirri in Articulata, so it is clear that further data and taxon sampling are needed to recover a more robust phylogeny of the group.
Disciplines :
Genetics & genetic processes
Zoology
Author, co-author :
Rouse, Greg W.
Jermiin, Lars S.
Wilson, Nerida G.
Eeckhaut, Igor  ;  Université de Mons > Faculté des Sciences > Biologie des Organismes Marins et Biomimétisme
Lanterbecq, Deborah ;  Université de Mons > Faculté des Sciences > Laboratoire Interfaces et Fluides Complexes
Oji, T
Young, CM
Browning, T
Cisternas, P
Helgen, LE
Stuckey, M
Messing, CG
Language :
German
Title :
Fixed, free, and fixed: The fickle phylogeny of extant Crinoidea (Echinodermata) and their Permian-Triassic origin
Publication date :
01 December 2012
Journal title :
Molecular Phylogenetics and Evolution
ISSN :
1055-7903
eISSN :
1095-9513
Publisher :
Elsevier, Atlanta, Canada
Volume :
66
Issue :
(1)
Pages :
161-181
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S864 - Biologie des Organismes Marins et Biomimétisme
Research institute :
R100 - Institut des Biosciences
Available on ORBi UMONS :
since 06 January 2013

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