Asteroidea of the North Pacific and adjacent waters pt. 2: Forcipulata (part)

Fisher, Walter K.

doi:10.5479/si.03629236.76.2

Cited by 50 publications

(107 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The distinctive morphology of forcipulates has always set them apart in traditional taxonomy (e.g. Fisher, 1928;Fisher, 1930), and they have usually been supported as monophyletic in both morphologybased cladistic analyses (e.g. Blake, 1987;Gale, 1987) and molecular phylogenetic studies (e.g.…”

Section: Gv Linchangco Et Almentioning

confidence: 99%

The phylogeny of extant starfish (Asteroidea: Echinodermata) including Xyloplax, based on comparative transcriptomics

Linchangco

Foltz

Reid

et al. 2017

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

A B S T R A C TMulti-locus phylogenetic studies of echinoderms based on Sanger and RNA-seq technologies and the fossil record have provided evidence for the Asterozoa-Echinozoa hypothesis. This hypothesis posits a sister relationship between asterozoan classes (Asteroidea and Ophiuroidea) and a similar relationship between echinozoan classes (Echinoidea and Holothuroidea). Despite this consensus around Asterozoa-Echinozoa, phylogenetic relationships within the class Asteroidea (sea stars or starfish) have been controversial for over a century. Open questions include relationships within asteroids and the status of the enigmatic taxon Xyloplax. Xyloplax is thought by some to represent a newly discovered sixth class of echinoderms -and by others to be an asteroid. To address these questions, we applied a novel workflow to a large RNA-seq dataset that encompassed a broad taxonomic and genomic sample. This study included 15 species sampled from all extant orders and 13 families, plus four ophiuroid species as an outgroup. To expand the taxonomic coverage, the study also incorporated five previously published transcriptomes and one previously published expressed sequence tags (EST) dataset. We developed and applied methods that used a range of alignment parameters with increasing permissiveness in terms of gap characters present within an alignment. This procedure facilitated the selection of phylogenomic data subsets from large amounts of transcriptome data. The results included 19 nested data subsets that ranged from 37 to 4,281 loci. Tree searches on all data subsets reconstructed Xyloplax as a velatid asteroid rather than a new class. This result implies that asteroid morphology remains labile well beyond the establishment of the body plan of the group. In the phylogenetic tree with the highest average asteroid nodal support several monophyletic groups were recovered. In this tree, Forcipulatida and Velatida are monophyletic and form a clade that includes Brisingida as sister to Forcipulatida. Xyloplax is consistently recovered as sister to Pteraster. Paxillosida and Spinulosida are each monophyletic, with Notomyotida as sister to the Paxillosida. Valvatida is recovered as paraphyletic. The results from other data subsets are largely consistent with these results. Our results support the hypothesis that the earliest divergence event among extant asteroids separated Velatida and Forcipulatacea from Valvatacea and Spinulosida.

show abstract

Section: Gv Linchangco Et Almentioning

confidence: 99%

The phylogeny of extant starfish (Asteroidea: Echinodermata) including Xyloplax, based on comparative transcriptomics

Linchangco

Foltz

Reid

et al. 2017

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

show abstract

“…Whether this higher level of diversity in genotype relative to phenotype represents within-species morphological variation or truly cryptic species requires further study (Carr 2010 The polychaete study emphasizes that many taxonomic issues persist among speciose Arctic clades. Early reports of morphological similarities among circumboreal and trans-Arctic echinoderms (sea stars and urchins) (e.g., Djakonov 1968;Fisher 1928Fisher , 1930 have also been questioned by more recent morphological examination of additional specimens, which indicated that several major taxa likely contained complexes of sibling species. Perhaps the best studied of the Arctic and sub-Arctic seastars is the genus Leptasterias, which includes a complex of approximately 60 species ranging from central California to Alaska, through the Arctic, and into the North Atlantic.…”

Section: Molecular Taxonomy: Applications For Dna Barcoding In the Armentioning

confidence: 99%

Biodiversity and phylogeography of Arctic marine fauna: insights from molecular tools

et al. 2010

View full text Add to dashboard Cite

The last decade has seen an increase in the frequency and breadth of application of molecular tools, many of which are beginning to shed light on long-standing questions in biogeography and evolutionary history of marine fauna. We explore new developments with respect to Arctic marine invertebrates, focusing on molecular taxonomy and phylogeography-two areas that have seen the most progress in the time-frame of the Census of Marine Life. International efforts to generate genetic 'barcodes' have yielded new taxonomic insights and applications ranging from diet analysis to identification of larval forms. Increasing availability of genetic data in public databases is also facilitating exploration of largescale patterns in Arctic marine populations. We present new case-studies in meta-population analysis of barcode data from polychaetes and echinoderms that demonstrate such phylogeographic applications. Emerging patterns from ours and other published studies include influences of a complex climatic and glacial history on genetic diversity and evolution in the Arctic, and contrasting patterns of both high gene flow and persistent biogeographic boundaries in contemporary populations.

show abstract

“…While extensive morphological (Fisher, 1911(Fisher, , 1928(Fisher, , 1930Hayashi, 1940Hayashi, , 1943Hayashi, , 1973Spencer and Wright, 1966;Fell, 1963;Heddle, 1967;Blake, 1987;Downey, 1973;Clark and Downey, 1992), developmental (Oguro et al, 1976;Komatsu et al, 1979;McEdward, 1992;Chia et al, 1993;Byrne and Cerra, 1996), biochemical (Kubo, 1961;Schopf and Murphy, 1973;Mochizuki and Hori, 1980;Matsuoka, 1981, Matsuoka et al, 1994, and molecular (Lafay et al, 1995;Wada et al, 1996;Knott and Wray, 2000) studies have been systematically carried out on starfishes, cytogenetic studies have not yet been applied to asteroid phylogeny.…”

Section: Introductionmentioning

confidence: 99%