Description of two new cercariae (an echinostome cercaria and a xiphidiocercaria) procured from Biomphalaria pfeifferi (Krauss) from Nigeria

Theodor Bilharz Research Institute

Bibliographic Information

Authors: Yousif F.; Ayoub M.; Tadros M.; El Bardicy S.; Abolarinwa S.

Journal: Journal of the Egyptian Society of Parasitology

Publication Date: August 2014

Volume / Issue: Volume 44 / Issue 2

Pages: 373–380

ISSN: 11100583

DOI: 10.12816/0006475

Scopus: View on Scopus

PubMed: 25597151

Document Type: Article

Access: All Open Access; Gold Open Access

Authors and Affiliations

Yousif F., Department of Environmental Research and Medical Malacology, Theodor Bilharz Research Institute, Giza, Egypt; Ayoub M., Department of Environmental Research and Medical Malacology, Theodor Bilharz Research Institute, Giza, Egypt; Tadros M., Department of Environmental Research and Medical Malacology, Theodor Bilharz Research Institute, Giza, Egypt; El Bardicy S., Department of Environmental Research and Medical Malacology, Theodor Bilharz Research Institute, Giza, Egypt; Abolarinwa S., Department of Environmental Research and Medical Malacology, Theodor Bilharz Research Institute, Giza, Egypt

Abstract

During parasitological examination of Biomphalaria pfeifferi snails obtained from Niger state (Nigeria), 2 new types of cercariae were found. They are identified to the level of referring to the major group and described here for the first time. They were examined viable and stained with vital stains as well as fixed in 70% alcohol. They were drawn with a camera lucida and photographed. They are identified as an echinostome cercaria and a xiphidiocercaria. The echinostome is characterized by having a ventral sucker almost double in size the oral one. It has a semicircular structure located beyond the oral sucker. Three pairs of penetration glands are found at the anterior portion of the body. The number of collar spines is relatively large (44-46). The flame cellsare 17 x 2 in number. Two main lateral excretory ducts extend anteriorly, form two typical echinostome loops then pass posteriorly to open together in a diverticulated excretory vesicle. Its tail is relatively long and flattened with 3 fin folds. The tail (640 μm) is longer than the body (475 μm). The xiphidiocercaria belongs to the "ornatae" group. It is relatively small (180.5 x 110 μm) with a long stylet (30 μm). Its oral sucker is one and half times the size of the ventral sucker. Two excretory ducts extend posteriorly in both sides and become dilated and unite to open in a circular excretoryvesicle. Tail is slender shorter than the body and has a dorso-ventral fin fold.

Keywords

Animals; Biomphalaria; Cercaria; Echinostoma; Nigeria; anatomy and histology; animal; classification; parasitology

Citation Information

Scopus Citations: 2

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