Rubtsova Nataliya Y, Balbuena Juan A, Sarabeev Volodimir L
Department of Biology, Zaporizhzhya National University, 66 Zhukovskogo Street, 69600 Zhaporizhzhya, Ukraine.
J Parasitol. 2007 Aug;93(4):772-80. doi: 10.1645/GE-884R.1.
Comparative morphology and multivariate morphometric analysis of monogeneans collected on flathead mullets Mugil cephalus from 2 Russian localities of the Japan Sea revealed the presence of 3 new species of Ligophorus, namely, L. domnichi n. sp., L. pacificus n. sp., and L. cheleus n. sp., which are described herein. So far, only 1 species of dactylogyrid monogenean identified as Ligophorus chabaudi was known on flathead mullets in this sea, but after comparison with the present material, we propose that this form actually represents L. domnichi n. sp. Results support previous zoogeographical evidence, suggesting that flathead mullets from different seas harbor different species complexes of Ligophorus. One interesting finding is that the 3 new species have a U-shaped ovary, whereas ovate ovaries have been reported in previous descriptions of species of the genus, e.g., L. vanbenedenii, L. parvicirrus, L. imitans, and L. chongmingensis. The U-shaped ovary was revealed only when the worms were observed in lateral view. The additional examination of L. vanbenedenii, L. parvicirrus, L. imitans, and L. pilengas specimens from our collections also revealed a U-shaped ovary in these forms as well. Further studies should establish whether or not this character is shared by all members of the genus.
对采自日本海2个俄罗斯地区的鲻鱼( Mugil cephalus )上的单殖吸虫进行比较形态学和多变量形态计量分析,发现了3种新的 Ligophorus 属物种,即多姆尼奇 Ligophorus domnichi 新种、太平洋 Ligophorus pacificus 新种和螯状 Ligophorus cheleus 新种,本文对其进行了描述。到目前为止,在这片海域的鲻鱼上仅知1种被鉴定为查氏 Ligophorus chabaudi 的指环虫科单殖吸虫,但与现有材料比较后,我们认为该形态实际上代表多姆尼奇 Ligophorus domnichi 新种。研究结果支持了先前的动物地理学证据,表明来自不同海域的鲻鱼携带不同的 Ligophorus 属物种复合体。一个有趣的发现是,这3个新物种具有U形卵巢,而在该属先前描述的物种,如范氏 Ligophorus vanbenedenii 、短尾 Ligophorus parvicirrus 、模仿 Ligophorus imitans 和崇明 Ligophorus chongmingensis 中,卵巢为卵形。只有从侧面观察虫体时才发现U形卵巢。对我们所收集的范氏 Ligophorus vanbenedenii 、短尾 Ligophorus parvicirrus 、模仿 Ligophorus imitans 和皮伦加斯 Ligophorus pilengas 标本的进一步检查也发现这些形态同样具有U形卵巢。进一步的研究应确定该特征是否为该属所有成员所共有。