REVISION OF THE LECANICEPHALIDEAN GENUS FLAPOCEPHALUS DESHMUKH, 1979 (EUCESTODA) FROM COWTAIL RAYS (GENUS PASTINACHUS RÜPPELL) (MYLIOBATIFORMES: DASYATIDAE JORDAN AND GILBERT) WITH THE DESCRIPTION OF FOUR NEW SPECIES.

IF 1.1 4区 医学 Q4 PARASITOLOGY
Katherine M Hanselman, Ramajeyam Gobiraj, Kirsten Jensen
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引用次数: 0

Abstract

The genus Flapocephalus Deshmukh, 1979, is a little-known group of lecanicephalidean cestodes parasitizing cowtail rays (genus Pastinachus Rüppell) mainly in the Indo-Pacific region. Since the erection of the genus, with Flapocephalus trygonis Deshmukh, 1979, as the type species, and the description of a second species, Flapocephalus saurashtri Shinde and Deshmukh, 1979, both from Pastinachus sephen (Fabricius) from India, reports of this genus have been restricted mainly to brief mentions or discussion of its validity and taxonomic placement. More recently, phylogenetic analyses based on molecular sequence data that included specimens of Flapocephalus have supported Flapocephalus as a distinct genus allied with the Polypocephalidae Meggitt, 1924. Limited by the amount of detail provided in the original descriptions, the unavailability of type material, and the lack of a detailed generic diagnosis, we aimed to fully characterize the genus based on newly collected specimens. A total of 38 specimens of Pastinachus, representing 3 of the 5 described species and 1 undescribed species, from throughout the Indo-Pacific region were examined for specimens of Flapocephalus. Worms were prepared for examination with light and scanning electron microscopy and as histological sections. A subset of specimens was included in a phylogenetic analysis based on data for a portion of the 28S rDNA gene. Overall, these specimens were found to include the type species, 4 new species that are described herein (Flapocephalus monostylorchis Hanselman and Jensen n. sp., Flapocephalus capitonis Hanselman and Jensen n. sp., Flapocephalus rudkinorum Hanselman and Jensen n. sp., and Flapocephalus infundibulapex Hanselman and Jensen n. sp.), and 4 putative new species. Flapocephalus trygonis is redescribed from specimens from Pastinachus ater (Macleay) from Sri Lanka, and a neotype is designated. The newly described species are distinct genetically and can be distinguished morphologically from the existing species and one another based on a combination of total length, the shape of the apical organ, and the arrangement of testes and vitelline follicles. A revised diagnosis of the genus and a key to the described species are presented, as is a hypothesis of the interrelationships resulting from a maximum likelihood analysis including 4 of the 5 described species and the 4 putative new species. The presence of 4 glandular, sac-like structures surrounded by scolex proper, with channels that open to the outside at the base of the apical organ, is reported in lecanicephalidean tapeworms for the first time.

对牛尾鳐属(pastinachus属rÜppell) (myliobatiformae: dasyatidae Jordan and gilbert)中flapocephalus deshmukh, 1979 (eucestoda)的修订,并附4个新种的描述。
Flapocephalus Deshmukh属,1979,是一个鲜为人知的寄生于牛尾鳐(Pastinachus r pell属)的lecanicephalidean cestodes群,主要生活在印度-太平洋地区。该属以Flapocephalus trygonis Deshmukh(1979)为模式种,另一种Flapocephalus saurashtri Shinde和Deshmukh(1979)分别来自印度的Pastinachus sephen (Fabricius),自建立以来,关于该属的报道主要局限于对其有效性和分类位置的简要提及或讨论。最近,基于Flapocephalus标本的分子序列数据的系统发育分析支持Flapocephalus是与Polypocephalidae相关的一个独特属。Meggitt, 1924。由于原始描述中提供的细节数量有限,缺乏类型材料,缺乏详细的属诊断,我们的目标是根据新收集的标本全面表征该属。对来自印度-太平洋地区的38个Pastinachus标本进行了Flapocephalus标本的检测,这些标本代表了5个已描述物种中的3个和1个未描述物种。制备蠕虫进行光镜、扫描电镜和组织学切片检查。根据28S rDNA基因的一部分数据,将标本的一个子集纳入系统发育分析。总体而言,这些标本包括模式种、本文所描述的新种4种(单stylorchis Flapocephalus Hanselman and Jensen n. sp.、capitonis Flapocephalus Hanselman and Jensen n. sp.、rudkinorum Flapocephalus Hanselman and Jensen n. sp.、infundibulapex Flapocephalus Hanselman and Jensen n. sp.)和推测新种4种。从斯里兰卡的Pastinachus ater (Macleay)的标本中重新描述了trygonis flapcephalus,并指定了一个新种。新描述的物种在遗传上是独特的,可以根据总长度、顶端器官的形状、睾丸和卵泡的排列组合在形态学上与现有物种区分开来。提出了该属的修正诊断和描述种的关键,并提出了一个由最大似然分析得出的相互关系假设,包括5个描述种中的4个和4个假定的新种。在棘头绦虫中,首次发现有4个腺状囊状结构,被固有头节包围,顶端器官基部有向外开放的通道。
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来源期刊
Journal of Parasitology
Journal of Parasitology 医学-寄生虫学
CiteScore
2.10
自引率
7.70%
发文量
60
审稿时长
2 months
期刊介绍: The Journal of Parasitology is the official peer-reviewed journal of the American Society of Parasitologists (ASP). The journal publishes original research covering helminths, protozoa, and other parasitic organisms and serves scientific professionals in microbiology, immunology, veterinary science, pathology, and public health. Journal content includes original research articles, brief research notes, announcements of the Society, and book reviews. Articles are subdivided by topic for ease of reference and range from behavior and pathogenesis to systematics and epidemiology. The journal is published continuously online with one full volume printed at the end of each year.
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