Hanelt B, Brant S V, Steinauer M L, Maina G M, Kinuthia J M, Agola L E, Mwangi I N, Mungai B N, Mutuku M W, Mkoji G M, Loker E S
Department of Biology, University of New Mexico, MSC03 2020, Albuquerque, New Mexico 87131-0001, USA.
Parasitology. 2009 Aug;136(9):987-1001. doi: 10.1017/S003118200900643X. Epub 2009 Jul 2.
Schistosoma kisumuensis n. sp. is described based on 6 adult males and 2 adult females collected from the circulatory system of 3 murid rodent species, Pelomys isseli, Mastomys natalensis, and Dasymys incomtus. Specimens were collected from a single location, Nyabera Swamp, in Kisumu, Kenya in the Lake Victoria Basin. This new species is morphologically similar to members of the S. haematobium group, currently represented by 8 species parasitizing artiodactyls and primates, including humans. Schistosoma kisumuensis differs from these species by producing relatively small Schistosoma intercalatum-like eggs (135.2 x 52.9 microm) with a relatively small length to width ratio (2.55). Comparison of approximately 3000-base-pair sequences of nuclear rDNA (partial 28S) and mtDNA (partial cox1, nad6, 12S) strongly supports the status of S. kisumuensis as a new species and as a sister species of S. intercalatum. The cox1 genetic distance between these two species (6.3%) is comparable to other pairwise comparisons within the S. haematobium group. Separation of the Congo River and Lake Victoria drainage basins is discussed as a possible factor favoring the origin of this species.
基于从三种鼠科啮齿动物（伊氏沼鼠、南非乳鼠和粗尾沼鼠）的循环系统中采集到的6只成年雄虫和2只成年雌虫，描述了基苏木血吸虫新种。标本采自肯尼亚维多利亚湖盆地基苏木的尼亚贝拉沼泽这一单一地点。这个新物种在形态上与埃及血吸虫组的成员相似，目前该组有8个物种寄生于偶蹄目动物和灵长类动物，包括人类。基苏木血吸虫与这些物种的不同之处在于，它产生相对较小的类似间插血吸虫的虫卵（135.2×52.9微米），长宽比相对较小（2.55）。对核核糖体DNA（部分28S）和线粒体DNA（部分cox1、nad6、12S）约3000个碱基对序列的比较有力地支持了基苏木血吸虫作为一个新物种以及作为间插血吸虫姐妹物种的地位。这两个物种之间的cox1基因距离（6.3%）与埃及血吸虫组内的其他两两比较结果相当。讨论了刚果河和维多利亚湖流域的分隔作为有利于该物种起源的一个可能因素。
