Heterogamety in the Baltic Glacial Relict Saduria entomon (Isopoda: Valvifera)
2010 (English)In: Journal of Crustacean Biology, ISSN 0278-0372, Vol. 30, no 4, 757-761 p.Article in journal (Refereed) Published
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
Place, publisher, year, edition, pages
2010. Vol. 30, no 4, 757-761 p.
IdentifiersURN: urn:nbn:se:sh:diva-8775DOI: 10.1651/09-3219.1ISI: 000284514100024ScopusID: 2-s2.0-78449284988OAI: oai:DiVA.org:sh-8775DiVA: diva2:420565