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This study presents the complete chromosomal genome assembly of the lettuce sea slug Elysia crispata, revealing a 542.56 Mb genome largely scaffolded into 15 pseudochromosomes. The research also includes mitochondrial sequencing and the recovery of chloroplast genomes from sequestered dietary algae, alongside high-quality microbial metagenome-assembled genomes.

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Abstract

We present a genome assembly from from a specimen of the clarki ecotype of an individual specimen of the lettuce sea slug Elysia crispata (lettuce sea slug; Mollusca; Gastropoda; Plakobranchidae). The genome sequence has a total length of 542.56 megabases. Most of the assembly (87.52%) is scaffolded into 15 chromosomal pseudomolecules. The mitochondrial genome has also been assembled, with a length of 14.17 kilobases. Additionally, we sequenced the chloroplast genomes of two dietary algae, Penicillus capitatus and P. lamourouxii , from plastids sequestered inside of slug cells where they remain photosynthetically active. Gene annotation of this assembly by Ensembl identified 18 436 protein-coding genes. From the metagenome data, we recovered six bins, of which four were high-quality MAGs.

Key findings

  • The Elysia crispata genome consists of 542.56 megabases with 87.52% scaffolded into 15 chromosomal pseudomolecules.
  • Mitochondrial and chloroplast genomes were successfully assembled, including the recovery of plastid sequences from sequestered algae Penicillus capitatus and P. lamourouxii.
  • Annotation identified 18,436 protein-coding genes, and metagenomic analysis yielded four high-quality microbial genome bins.

Keywords

GenomeMetagenomicsWhole genome sequencingChloroplastSequence assemblyGene

Identifiers

DOI
10.12688/wellcomeopenres.26088.1
Journal
Wellcome Open Research
Year
2026