Heterogamety in the baltic glacial relict Saduria entomon (Isopoda: Valvifera)

Marta Tomaszkiewicz, Katarzyna Smolarz, MacIej Wołowicz

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2 Scopus citations


This study describes the karyology of an isopod, Saduria entomon, and provides for the first time evidence of a XY/XX heterogamety for this species. The presented karyotype [56 (m + sm ) + 2 st + XX/XY] is characterised by the dominance of metacentric and submetacentric chromosomes and is considered as apomorphic. This is the first time a valviferan is described with an XX/XY system. Mitotic and meiotic heterogamety observed in S. entomon suggests more advanced evolution of sex determination within this species in comparison to other Isopoda. Based on Ag-staining the presence of secondary constrictions and satellites on the 22nd pair of homologous chromosomes was identified. Inter- and intra-individual variability in chromosome number (2n = 58, 2n = 59 or 2n = 61) was also observed. The between-species variation in heterogamety in isopods and the within-species variation in chromosomes numbers are discussed.

Original languageEnglish (US)
Pages (from-to)757-761
Number of pages5
JournalJournal of Crustacean Biology
Issue number4
StatePublished - Nov 2010

All Science Journal Classification (ASJC) codes

  • Aquatic Science


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