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Morphological description of Cosmocerca sp. (Nematoda: Cosmocerdidae) from the Mascarene grass frog Ptychadena cf. mascareniensis (Amphibia: Ptychadenidae). A light and scanning electron microscopic studies

Rewaida Abdel-Gaber, Fathy Abdel-Ghaffar, Reem Kamel, Sherein Maher, Nashwa El Deeb, Saleh Al Quraishy and Heinz Mehlhorn
From the journal Acta Parasitologica


The Mascarene grass frog Ptychadena cf. mascareniensis is a species of frog with a vast area of distribution in Africa. A total of 300 frog specimens were collected from different localities at El-Giza province, Egypt; then dissected and examined for the presence of parasitic infection. Only eighty six (28.66%) specimens were found to be naturally infected with nematode parasite. Seasonally, the prevalence of infection was reached its maximum value of 74.66% during summer and minimum values of 26.66% (20/75), 13.33% (10/75) during spring and autumn, respectively; while no records were observed during winter season. The morphology of the recovered parasite was studied by using light and scanning electron microscopy. The adult worm characterized by anterior extremity with small mouth opening being surrounded by three lips provided with four sub-median cephalic papillae and one pair of lateral amphids. Body measurements showed that male worms were smaller than females measuring 1.22–2.43 (2.21 ± 0.1) mm in length and 0.21–0.34 (0.29 ± 0.01) mm in width. Females measured 1.9–3.7 (2.8 ± 0.1) mm in length and 0.24–0.42 (0.38 ± 0.01) mm in width. Comparing the present parasite with other species of the same genus described previously, several similarities were observed. However, peculiar new characteristics such as the arrangement of plectanes and somatic papillae, the presence of gubernaculum, the position of nerve ring, excretory pore, and vulval opening make it reasonable belongs to the family Cosmocercidae and identified as Cosmocerca sp. In addition, the present study was the first report for occurrence of cosmocercid species from the Mascarene grass frog in Egypt.

  1. Conflict of interest Authors stated that there is no conflict of interest.


The authors are thankful to the Faculty of Science, Cairo University, Cairo, Egypt, for providing all the facilities to complete this work. Also, authors extend their appreciation to The Deanship of Scientific Research at King Saud University for funding the work through the international research group project PRG-1436-02.


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Received: 2016-11-29
Revised: 2017-1-6
Accepted: 2017-1-20
Published Online: 2017-4-18
Published in Print: 2017-6-1

© 2017 W. Stefański Institute of Parasitology, PAS