Moravec František, Nagasawa Kazuya, Madinabeitia Ione
Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 3705 České Budějovice, Czech Republic.
Graduate School of BiosphereScience, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima739-8528,Japan.
Acta Parasitol. 2018 Dec 19;63(4):802-807. doi: 10.1515/ap-2018-0097.
An insufficiently known nematode species Dichelyne (Cucullanellus) jialaris Luo, Guo, Fang et Huang, 2004 (Cucullanidae), originally described from the red seabream Pagrus major (Temminck et Schlegel) (Sparidae) in the Taiwan Strait, off China, is redescribed based on light and scanning electron microscopical (SEM) examinations of specimens collected from the intestine of three species of sparid fishes, Acanthopagrus schlegelii (Bleeker), Evynnis tumifrons (Temminck et Schlegel) and P. major, in Hiroshima Bay, Japan. The present redescription provides exact data on the cephalic structure, character of cephalic papillae and amphids, location of the excretory pore, deirids and phasmids, and the number and distribution of caudal papillae in the male; the presence of the dorsal postdeirid in this species is reported for the first time. The SEM study revealed that the anterior cloacal lip has a median lobe-like elevation bearing two minute papillae, whereas the posterior cloacal lip is somewhat depressed, with a median longitudinal rod-like elevation probably serving to direct the movement of spicules. The size of eggs is reported for the first time. Dichelyne (C.) jialaris differs from the morphologically similar D. (C.) pleuronectidis (Yamaguti, 1935) mainly in the shape of the oesophagus. The present finding of D. (C.) jialaris represents the first record of this nematode from fishes in Japanese waters and A. schlegelii and E. tumifrons are its new host records.
一种鲜为人知的线虫物种——贾氏双吻线虫Dichelyne (Cucullanellus) jialaris Luo, Guo, Fang et Huang, 2004（双吻科），最初是在中国台湾海峡的真鲷Pagrus major (Temminck et Schlegel)（鲷科）中描述的，现基于对从日本广岛湾的三种鲷科鱼类，即黑棘鲷Acanthopagrus schlegelii (Bleeker)、黄鳍鲷Evynnis tumifrons (Temminck et Schlegel)和真鲷P. major的肠道中采集的标本进行的光学显微镜和扫描电子显微镜（SEM）检查进行重新描述。本次重新描述提供了关于头部结构、头部乳突和头感器的特征、排泄孔、侧器和尾感器的位置以及雄性尾乳突的数量和分布的确切数据；首次报道了该物种存在背侧后侧器。扫描电子显微镜研究表明，泄殖腔前唇有一个带有两个微小乳突的中位叶状隆起，而泄殖腔后唇有点凹陷，有一个中位纵向棒状隆起，可能用于引导交合刺的运动。首次报道了虫卵的大小。贾氏双吻线虫Dichelyne (C.) jialaris与形态相似的褶鲷双吻线虫D. (C.) pleuronectidis (Yamaguti, 1935)的主要区别在于食管的形状。本次发现的贾氏双吻线虫D. (C.) jialaris是该线虫在日本水域鱼类中的首次记录，黑棘鲷A. schlegelii和黄鳍鲷E. tumifrons是其新的宿主记录。
