原头绦虫截形杯头绦虫（绦虫纲：叶槽绦虫目）的染色体研究

A chromosome study in the progenetic cestode Cyathocephalus truncatus (Cestoda:Spathebothriidea).

作者信息

Petkeviciute R

机构信息

Institute of Ecology, Lithuanian Academy of Sciences, Vilnius, Lithuania.

出版信息

Int J Parasitol. 1996 Nov;26(11):1211-6. doi: 10.1016/s0020-7519(97)89737-8.

DOI:10.1016/s0020-7519(97)89737-8

PMID:9024864

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.

摘要

利用标准吉姆萨染色法，对来自楚科奇半岛西北部的湖沼钩虾（Gammarus lacustris）体内的寄生绦虫——截形杯首绦虫（Cyathocephalus truncatus）子代体细胞的染色体进行了研究。此前未被描述过的该核型由9对染色体（2n = 18）组成，这是绦虫中最常见的染色体数目。在制片中发现了相当数量的多倍体细胞（34.7%）。染色体相对较大，长达12.26微米。根据着丝粒指数值，第1和第4号染色体为亚端着丝粒染色体；第2号染色体为近端着丝粒至亚端着丝粒染色体；第3和第5号染色体为近端着丝粒染色体；第6和第9号染色体为中着丝粒染色体；第7号染色体为亚中着丝粒至亚端着丝粒染色体；第8号染色体为亚中着丝粒染色体。结合此前在其他密切相关的叶形目和假叶目类群中描述过的核型，对这些特征进行了讨论。