title: A chromosome study in the progenetic cestode Cyathocephalus truncatus (Cestoda:Spathebothriidea).
abstract: The chromosomes of somatic cells of progenetic Cyathocephalus truncatus, parasite of amphipod crustaceans, Gammarus lacustris, from North-West Chukotka were investigated using standard Giemsa staining. The karyotype, not described previously, consists of 9 pairs of chromosomes (2n = 18), the most widespread number among cestodes. A considerable number of polypoid cells (34.7%) was noted in preparations. The chromosomes are comparatively large, up to 12.26 microns. According to centromeric index values, chromosomes 1 and 4 subtelocentric; 2, acrocentric to subtelocentric; 3 and 5, acrocentric; 6 and 9, metacentric; 7 submeta-subtelocentric; and 8, submetacentric. These characteristics are discussed with reference to the karyotypes previously described within other closely related groups caryophyllideans and pseudophyllideans.
authors.affiliation: Institute of Ecology, Lithuanian Academy of Sciences, Vilnius, Lithuania.
authors.forename: R
authors.initials: R
authors.lastname: Petkeviciute
mesh_terms: D000818:Animals; D001399:Azure Stains; D002589:Cestoda / Q000235:genetics* / Q000302:isolation & purification; D002874:Chromosome Mapping; D002875:Chromosomes / Q000502:physiology*; D003445:Crustacea / Q000469:parasitology*; D007621:Karyotyping; D011003:Ploidies; D013045:Species Specificity
chemical_list: D001399:Azure Stains