The chromosomal genome sequence of the lettuce sea slug, Elysia crispata (Mörch, 1863) (Plakobranchidae) and its associated microbial metagenome sequences

<ns3:p> We present a genome assembly from from a specimen of the <ns3:italic>clarki</ns3:italic> ecotype of an individual specimen of the lettuce sea slug <ns3:italic>Elysia crispata</ns3:italic> (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, <ns3:italic>Penicillus capitatus</ns3:italic> and <ns3:italic>P. lamourouxii</ns3:italic> , 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. </ns3:p>