Eudy Elizabeth, Caira J N, Jensen K
1 Department of Ecology and Evolutionary Biology, 75 N. Eagleville Road Unit 3043, University of Connecticut, Storrs, Connecticut 06269-3043.
2 Department of Ecology and Evolutionary Biology and the Biodiversity Institute, 1200 Sunnyside Avenue, University of Kansas, Lawrence, Kansas 66045.
J Parasitol. 2019 Apr;105(2):303-312.
Collection of cestodes from the Taiwan saddled carpetshark, , for the first time led to the discovery of n. sp. This species provided important insights into the identity of the heretofore monotypic -known previously only from the blind electric ray, , in New Zealand. The new species differs from in testis number, vitelline follicle and cirrus sac configuration, and in that it is hyperapolytic rather than euapolytic. Maximum-likelihood analysis of sequence data generated for the D1-D3 region of the gene not only confirmed this generic placement but also confirmed the close affinities between both species of and specimens previously referred to in the literature as new genus 7 n. sp. 1. Examination of limited material of the latter, including that of a second specimen from which partial sequence data were generated here, led to the realization that new genus 7 n. sp. 1 represents an undescribed species of , referred to here as n. sp. 2. All 3 species share bothridia divided into 1 anterior and 2 consecutive pairs of loculi. Given that n. sp. 2 parasitizes a member of the second and only other genus of parascylliid sharks (i.e., ), we predict that the 4 other species of and the 2 other species of are likely to host other species of . The factors that might account for the eclectic host associations of , which include a torpediniform ray and 2 species of orectilobiform sharks, are currently unclear. The compilation of diet data for these elasmobranchs and determination of the final intermediate hosts for these cestodes would be interesting avenues of further investigation given that cestodes are trophically transmitted between their intermediate and definitive hosts. The phylogenetic affinities of among elasmobranch cestodes remain unresolved.
首次从台湾鞍纹鲨体内采集到绦虫，从而发现了新物种。该物种为此前仅在新西兰盲电鳐体内发现的单型属提供了重要的身份信息。新物种在睾丸数量、卵黄滤泡和阴茎囊结构方面与已知物种不同，并且它是高度溶解型而非完全溶解型。对基因D1 - D3区域生成的序列数据进行的最大似然分析不仅证实了该属的分类地位，还证实了两个物种与文献中先前称为新属7新物种1的标本之间的密切亲缘关系。对后者有限材料的研究，包括此处生成部分序列数据的第二个标本，发现新属7新物种1代表了一个未描述的物种，在此称为新物种2。所有这3个物种都有分为1个前部和2对连续小室的吸铗。鉴于新物种2寄生于副须鲨科鲨鱼的第二个也是唯一的另一个属的成员（即），我们预测副须鲨科的其他4个物种和须鲨科的其他2个物种可能寄生于其他物种。目前尚不清楚可能导致寄生于包括电鳐和2种须鲨科鲨鱼在内的多种宿主的因素。鉴于绦虫在中间宿主和终末宿主之间通过营养方式传播，汇编这些软骨鱼类的饮食数据并确定这些绦虫的最终中间宿主将是进一步研究的有趣途径。绦虫在软骨鱼类绦虫中的系统发育亲缘关系仍未解决。
