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Preliminary cladistic analysis of genera of the cestode order Trypanorhyncha Diesing, 1863

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Abstract

A preliminary cladistic analysis was carried out on the 49 currently recognised genera of the order Trypanorhyncha. Forty-four characters were analysed; a functional outgroup was used for scolex and strobilar characters, while Nybelinia was utilised to polarise characters related to the rhyncheal system. Eight well-resolved clades were evident in the resultant cladogram, which is compared with existing phenetic classifications. An analysis of families resulted in a similar clustering of taxa to that observed in the case of the genera. The results suggest that two key characters used in existing classifications, namely the presence of sensory fossettes on the bothridia and the development of atypical heteroacanth and poeciloacanth armatures from typical heteroacanth armatures, have occurred on several occasions. Some clades provide support for the arrangements used in current classifications. Suggestions are made for future avenues of research which might provide more robust phylogenetic data for the Trypanorhyncha.

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  1. I. Beveridge
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Beveridge, I. Preliminary cladistic analysis of genera of the cestode order Trypanorhyncha Diesing, 1863. Syst Parasitol 42, 29–49 (1999). https://doi.org/10.1023/A:1006011512221

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