Echinocephalus janzeni n. sp. (Nematoda: Gnathostomatidae) in Himantura pacifica (Chondrichthyes: Myliobatiformes) from the Pacific coast of Costa Rica and Mexico, with historical biogeographic analysis of the genus
Echinocephalus janzeni n. sp. (Nematoda: Gnathostomatidae) in Himantura pacifica (Chondrichthyes: Myliobatiformes) from the Pacific coast of Costa Rica and Mexico, with historical biogeographic analysis of the genus
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DOI：
10.2307/3284726
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发表时间：
1998-06-01
影响因子：
1.3
通讯作者：
Erbe, E
中科院分区：
文献类型：
--
作者：
Hoberg, EP;Brooks, DR;Erbe, E
棘头绦虫在黄貂鱼Himantura pacifica中发现了一种新的物种，分布于哥斯达黎加和墨西哥南部的东太平洋沿岸。根据雄虫肛后尾乳头有6个，尾翅前有变形环，雌虫肛后尾乳头有6个，尾翅前有变形环，雌虫肛后尾乳头有6个。janzeni与Echinocephalus daileyi和Echinocephalus diazi最相似。E. janzeni与E. dialeyi的尾翼为双叶，颈囊较长，可达食管长度的65%; janzeni与E.根据头棘的排数来计算（30-38 vs. 26-27）、肛后尾乳头的排列、3个而不是2个肛前乳头、肛门与外阴的相对位置和距离（395-460 μ m vs.70 μ m）、具末端表皮褶皱的趾状雌尾和雌尾的长度（450-480 μ m vs.270 μ m）。10种棘头虫属的分支系统学分析。结果得到一个最简约的树（一致性指数= 0.893），并将E. janzeni在一个高度衍生的亚支中，其中E. daileyi是E. diazi + E. janzeni。对宿主和寄生虫的历史地理学分析为河鲀黄貂鱼起源于太平洋而不是大西洋提供了支持。
Echinocephalus janzeni n. sp. in the stingray, Himantura pacifica, is described from the eastern Pacific Ocean off the coasts of Costa Rica and southern Mexico. On the basis of the presence of 6 postanal caudal papillae, and modified annules anterior to the caudal alae in males, E. janzeni is most similar to Echinocephalus daileyi and Echinocephalus diazi. Specimens of E. janzeni are distinguished from those of E. dialeyi by bilobed caudal alae and long cervical sacs that extend up to 65% of the length of the esophagus; E. janzeni is differentiated from E. diazi by the number of rows of cephalic spines (30-38 vs. 26-27), arrangement of the postanal caudal papillae, 3 rather than 2 preanal papillae, relative position and distance between the anus and vulva (395-460 mu m vs. 70 mu m), the digitiform female tail with a terminal cuticular fold, and the length of the female tail (450-480 mu m vs. 270 mu m). Cladistic analysis of the 10 Echinocephalus spp. resulted in a single most parsimonious tree (consistency index = 0.893) and placed E. janzeni in a highly derived subclade where E. daileyi is the sister species of E. diazi + E. janzeni. Historical biogeographic analysis of hosts and parasites provides support for origins in the Pacific rather than the Atlantic for the potamotrygonid stingrays.