Curran Stephen S, Overstreet Robin M, Tkach Vasyl V
Department of Coastal Sciences, The University of Southern Mississippi, 703 East Beach Drive, Ocean Springs, Mississippi 39564, USA.
J Parasitol. 2007 Dec;93(6):1452-8. doi: 10.1645/GE-1207.1.
Plagiocirrus loboides n. sp. (Digenea: Opecoelidae) is described from Fundulus nottii, F. dispar blairae, F. chrysotus, and Notemigonus crysoleucas from the Pascagoula River in Mississippi. Plagiocirrus loboides differs from P. primus Van Cleave and Mueller, 1932, by having a longer postcecal space (14-25% of body length vs. about 7%); a more anterior vitellarium (extending at least to the middle of the ventral sucker vs. to its posterior margin); and larger eggs (51-71 microm long by 23-34 microm wide vs. 40-55 microm long by 30-35 microm wide). Plagiocirrus loboides differs from P. testeus Fritts, 1959, by having a long postcecal space (vs. < 5% of body length); irregular, oblique, contiguous testes (vs. strongly lobed, well separated, tandem testes); and a more extensive vitellarium. Plagiocirrus loboides differs from both congeners by having an ovary comprised of 3 or 4 distinct lobes rather than having an entire ovary. Plagiocirrus wuyienensis Wang, 1981, from Hemimyzon zebroidus in Fujian Province, China, is herein considered a species inquirenda because it has a Y-shaped excretory bladder. Molecular phylogenetic analysis of 28S rDNA gene fragments from P. loboides and 17 digenean species demonstrates that Plagiocirrus belongs in Opecoelidae.
叶状斜环吸虫新种（复殖吸虫纲：孔肠科）是从密西西比州帕斯卡古拉河的诺氏底鳉、布莱尔氏底鳉、金腹底鳉和银汉鱼中发现并描述的。叶状斜环吸虫与1932年范·克利夫和米勒发现的原斜环吸虫不同，其盲肠后间隙更长（占体长的14%-25%，而原斜环吸虫约为7%）；卵黄腺位置更靠前（至少延伸至腹吸盘中部，而原斜环吸虫延伸至腹吸盘后缘）；卵更大（长51-71微米，宽23-34微米，而原斜环吸虫长40-55微米，宽30-35微米）。叶状斜环吸虫与1959年弗里茨发现的试验斜环吸虫不同，其盲肠后间隙长（试验斜环吸虫小于体长的5%）；睾丸不规则、倾斜且相邻（试验斜环吸虫睾丸强烈分叶、分隔良好且呈串联排列）；卵黄腺更广泛。叶状斜环吸虫与这两个同属物种的不同之处在于其卵巢由3或4个明显的叶组成，而非完整的卵巢。1981年王从中国福建省斑纹半刺厚唇鱼中发现的武夷斜环吸虫，因其具有Y形排泄囊，在此被视为待定物种。对叶状斜环吸虫和17种复殖吸虫的28S rDNA基因片段进行的分子系统发育分析表明，斜环吸虫属属于孔肠科。
