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We present a genome assembly from an individual Marthasterias glacialis (the spiny starfish; Echinodermata; Asteroidea; Forcipulatida; Asteriidae). The genome sequence is 521 megabases in span. The majority of the assembly, 99.44%, is scaffolded into 22 chromosomal pseudomolecules. The mitochondrial genome has also been assembled, and is 16 kb in span.
Figure 1. . An image of the sequenced specimen, eaMarGlac1, taken immediately prior to processing and preservation.
Figure 2. . Genome assembly of
Marthasterias glacialis, eaMarGlac1.1: metrics.The BlobToolKit Snailplot shows N50 metrics and BUSCO gene completeness. The main plot is divided into 1,000 size-ordered bins around the circumference with each bin representing 0.1% of the 520,959,849 bp assembly. The distribution of scaffold lengths is shown in dark grey with the plot radius scaled to the longest scaffold present in the assembly (38,475,774 bp, shown in red). Orange and pale-orange arcs show the N50 and N90 scaffold lengths (25,218,880 and 15,203,031 bp), respectively. The pale grey spiral shows the cumulative scaffold count on a log scale with white scale lines showing successive orders of magnitude. The blue and pale-blue area around the outside of the plot shows the distribution of GC, AT and N percentages in the same bins as the inner plot. A summary of complete, fragmented, duplicated and missing BUSCO genes in the metazoa_odb10 set is shown in the top right. An interactive version of this figure is available at
https://blobtoolkit.genomehubs.org/view/eaMarGlac1.1/dataset/CAJVRT01/snail.
Figure 3. . Genome assembly of
Marthasterias glacialis, eaMarGlac1.1: GC-coverage.BlobToolKit GC-coverage plot. Scaffolds are coloured by phylum. Circles are sized in proportion to scaffold length. Histograms show the distribution of scaffold length sum along each axis. Scaffolds labelled Chordata are spurious and assumed to reflect some confusion in the sequence databases from which data is pulled. An interactive version of this figure is available at
https://blobtoolkit.genomehubs.org/view/eaMarGlac1.1/dataset/CAJVRT01/blob.
Figure 4. . Genome assembly of
Marthasterias glacialis, eaMarGlac1.1: cumulative sequence.BlobToolKit cumulative sequence plot. The grey line shows cumulative length for all scaffolds. Coloured lines show cumulative lengths of scaffolds assigned to each phylum using the buscogenes taxrule. An interactive version of this figure is available at
https://blobtoolkit.genomehubs.org/view/eaMarGlac1.1/dataset/CAJVRT01/cumulative.
Figure 5. . Genome assembly of
Marthasterias glacialis, eaMarGlac1.1: Hi-C contact map.Hi-C contact map of the eaMarGlac1.1 assembly, visualised in HiGlass. Chromosomes are shown in order of size from left to right and top to bottom.
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