Chromosomal mapping of ribosomal clusters and telomeric sequences (TTAGG)<i>_n</i> in nine species of lobsters (Crustacea, Decapoda)

Lobsters are ubiquitous, economically important decapod crustaceans with apparently conflicting evolutionary relationships. Here, we describe the chromosomal location of major (45S rDNA) and minor (5S ribosomal gene families in four species Astacidea five Achelata, using two-color FISH. The family is located 4–16 sites per diploid chromosome set, Nephrops norvegicus (Nephropidae) showing highest number described so far Decapoda. 5S rDNA two eight species; only crayfish Procambarus clarkii FISH signals were detected together additional weaker signals. Furthermore, N. genes syntenic one cluster. Moreover, by pentanucleotide (TTAGG)n telomeric repeat Nephropidae studied, occurrence a colocalization 45S sequences Homarus gammarus. comparison locations repetitive Mediterranean, Atlantic, South African lobster as well marine freshwater ones provides information on evolution cytotaxonomy