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1 November 2010 Heterogamety in the Baltic Glacial Relict Saduria entomon (Isopoda: Valvifera)
Marta Tomaszkiewicz, Katarzyna Smolarz, Maciej Wołowicz
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Abstract

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.

Marta Tomaszkiewicz, Katarzyna Smolarz, and Maciej Wołowicz "Heterogamety in the Baltic Glacial Relict Saduria entomon (Isopoda: Valvifera)," Journal of Crustacean Biology 30(4), 757-761, (1 November 2010). https://doi.org/10.1651/09-3219.1
Received: 16 September 2009; Accepted: 1 March 2010; Published: 1 November 2010
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