Delineating the W Sex Chromosome in the Clam Shrimp, Eulimnadia texana

Our findings suggest that E. texana's W chromosome contains a smaller region of crossover suppression, supporting the hypothesis that it is a proto-sex chromosome in early evolutionary development. This study provides valuable insights into early sex chromosome evolution and establishes E. texana as an ideal model for further investigation of evolutionary processes driving proto-sex chromosome differentiation.