hymenolepis nana
Phylogenetic relationships  based on CO1 mitochonderial DNA sequences of two Hymenolepidid species from Egypt
Two hymenolepidid tapeworms, Hymenolepis diminuta and H. nana are commonly maintained in laboratory rodents and used in many experimental model systems of tapeworm infections. We examined partial sequences from the mitochondrial cytochrome c oxidase subunit 1 (CO1) gene sequences to infer phylogenetic relationships of the 2 hymenolepidid species. Parts of the CO1 gene were amplified by PCR and sequenced directly. The CO1 gene sequence obtained was the same in length among all specimens. however, several insertions and deletions were detected not only among species but also between an reference isolate and new isolates. Phylogenetic trees inferred from the nucleotide sequences showed similar topology.