# The genome sequence of the fin whale, Balaenoptera physalus (Linnaeus, 1758) (Artiodactyla: Balaenopteridae)

## TL;DR

The paper presents the genome sequence of the fin whale, including two haplotypes and the mitochondrial genome, as part of a project to sequence species in Britain and Ireland.

## Contribution

The novel contribution is the high-quality genome assembly of the fin whale, including chromosomal pseudomolecules and sex chromosomes.

## Key findings

- The genome assembly includes two haplotypes with lengths of 3,442.54 and 2,850.21 megabases.
- Haplotype 1 is scaffolded into 23 chromosomal pseudomolecules, including X and Y sex chromosomes.
- The mitochondrial genome is 16.4 kilobases long.

## Abstract

We present a genome assembly from an individual male
Balaenoptera physalus (fin whale; Chordata; Mammalia; Artiodactyla; Balaenopteridae). The assembly contains two haplotypes with total lengths of 3 442.54 megabases and 2 850.21 megabases. Most of haplotype 1 (79.11%) is scaffolded into 23 chromosomal pseudomolecules, including the X and Y sex chromosomes. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 16.4 kilobases. This assembly was generated as part of the Darwin Tree of Life project, which produces reference genomes for eukaryotic species found in Britain and Ireland.