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Sci-Afric Journal of Scientific Issues, Research and Essays (SJSIRS)

Sci-Afric Journal of Scientific Issues, Research and Essays Vol.2(2) Pp. 94-107 February 2014 Copyright 2014 Sci-Afric Publishers.


Observation of Branchiobdellidae (Clitellata, Annelida) on Freshwater Crayfish Pacifastacus leniusculus in British Columbia, Canada.

*Naglaa M SH Geasa.


Zoology Department, Faculty of Science, Tanta University, Egypt.


*Corresponding Author’s E-mail: geasa2@zebrahost.com   

Accepted February 27th, 2014


Branchiobdellidans, or crayfish worms, form an obligate, ectosymbiotic association primarily with freshwater crayfishes. To the best of my knowledge, studies of branchiobdellidans of British Columbia and elsewhere in Canada have not been reported with some exceptions. Targeted surveillance of World Organisation for Animal Health-listed pathogens prompted collecting crayfish from sites in British Columbia and identifying identify the species of branchiobdellidans isolated from them, so as to extend previous reports of branchiobdellidans there. Light microscopic examination of 122 crayfish Pacifastacus leniusculus collected from 7 lakes of British Columbia revealed infestations by seven species of branchiobdellidans, four from the genus Xironogiton (X. instabilis, X. victoriensis, X. occidentals, and X. cassiensis), and three from the genus Cambarincola (C. fallax, C. macrocephelus, and C. montanus). Cambarincola cocoons were observed, and their hatching was recorded. Adult C. macrocephelus were observed, believed to be the first such record in this region. Scanning electron microscopy showed that the investigated species all had body wall patterns, head size, jaws, dental formula, and shape and position of teeth that were distinctive by species.

Keywords: Annelids; branchiobdellidans, Cambarincola; Xironogiton.



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