埃塞俄比亚塔纳湖鲤科鱼类体内亚美尼亚许氏绦虫Khawia armeniaca (Cholodkovsky, 1915) Shulman, 1958 (绦虫纲: 鲤蠢目) 的形态鉴定

在埃塞俄比亚境内塔纳湖中发现了1种寄生于鲤科鱼类: 间魮(Labeobarbus intermedius)和Labeobarbus tsanensis体内的许氏绦虫, 经形态学鉴定其为亚美尼亚许氏绦虫Khawia armeniaca (Cholodkovsky, 1915)(绦虫纲: 鲤蠢目)。该绦虫鉴别特征为头节呈半球状, 边缘光滑, 无皱褶; 睾丸分布区域从虫体中部至阴茎囊之前; 卵巢前卵黄腺分布于虫体中后部至阴茎囊前部区域, 少数排列在阴茎囊之后; 子宫起始于阴茎囊后方弯曲环绕直至卵巢后部区域, 有少许卵黄腺排列在子宫和卵巢的两侧。此外, K. armeniaca卵巢呈滤泡状或蝴蝶状, 雌雄生殖孔分离但彼此距离很近, 开口于体表并形成同一生殖腔, 且雄性生殖孔位于雌性生殖孔前方。卵巢后卵黄腺数目少于100个, 分布于虫体末端, 卵黄腺距离卵巢后翼较远, 部分样品内卵黄腺接近卵巢后翼。

REDESCRIPTION OF THE MONOZOIC CESTODE KHAWIA ARMENIACA (CHOLODKOVSKY, 1915) SHULMAN, 1958 (CESTODA: CARYOPHYLLIDEA) FROM CYPRINID FISH IN TANA LAKE,ETHIOPIA

Khawia armeniaca (Cholodkovsky, 1915) (Cestoda: Lytocestidae) is described from cyprinids Labeobarbus intermedius and Labeobarbus tsanensis in Tana Lake in Ethiopia. It is characterised with its afossate scolex in a semi-bulbate shape and a smooth anterior margin. Testes are distributed at the median, with the testicular field reaching the anterior region of cirrus sac. Previtelline follicles are distributed at median and lateral body, extending to anterior or posterior region of the cirrus sac. Uterus is looped between the posterior region of the ovary and the posterior region of the cirrus sac, not reaching the anterior region of the cirrus sac. Few vitelline follicles are present along the uterus margin and few or rare along the ovarian margin. K. armeniaca possesses follicular and butterfly-shaped ovary, with gonopores separated but close to each other, and male gonopore is at the anterior region of the female gonopore, but form a common genital atrium at the surface. Postovarian vitelline follicles are less than 100, touching or far from the posterior ovarian arm.