# The complete annotated mitochondrial genome of Cerastoderma glaucum (Bruguière, 1789) from the Baltic Sea

## TL;DR

This paper presents the full mitochondrial genome of the bivalve Cerastoderma glaucum from the Baltic Sea, offering insights into its genetic structure and reproductive traits.

## Contribution

The study provides the first complete annotated mitochondrial genome of Cerastoderma glaucum and reveals its lack of mitochondrial heteroplasmy.

## Key findings

- The mitochondrial genome is 14,953 bp long and encodes 13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes.
- Baltic and English C. glaucum samples show close genetic affinity with a p-distance of 0.027.
- No mitochondrial heteroplasmy was detected, indicating it is not a doubly uniparental inheritance species.

## Abstract

Cerastoderma glaucum is a key intertidal bivalve in the north-east Atlantic, serving as a trophic resource for fish and birds. Its mitochondrial genome comprises 14,953 bp, encoding 13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes. Gene structure resembles Cerastoderma edule but lacks an additional methionine tRNA. Phylogenetic analysis revealed close affinity between Baltic and English samples (p-distance = 0.027). No mitochondrial heteroplasmy was detected in mature male gonads, suggesting C. glaucum is not a doubly uniparental inheritance (DUI) species. These findings contribute to understanding mitogenomic variation and reproductive biology in bivalves inhabiting dynamic coastal ecosystems .