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1 June 2004 COMMENTS ON THE GONOTYL OF PROCTOCAECUM MACROCLEMIDIS () N. COMB. (DIGENEA: ACANTHOSTOMIDAE: ACANTHOSTOMINAE), WITH A KEY TO THE GENERA OF ACANTHOSTOMINAE AND NEW PHYLOGENETIC TREE FOR PROCTOCAECUM BAUGH, 1957
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Abstract

The species recently described as Acanthostomum macroclemidis possesses the gonotyl in the form of a solid muscular pad uniquely diagnostic for species of Proctocaecum and is accordingly transferred to that genus. An artificial key to the 5 acanthostomine genera, as well as an updated phylogenetic hypothesis for the 10 known species of Proctocaecum, based on 11 characters and including 2 species described since the last phylogenetic analysis, are presented. The single most parsimonious phylogenetic tree with a consistency index of 87.5% suggests that Proctocaecum originated in Africa and spread to North America and South America before the breakup of Pangaea. As a result, the 2 North American and 1 South American species are most closely related to different African members of the genus. African and Indo-Pacific species inhabit crocodylids; hence, the occurrence of North American species in alligatorids and chelonians and a South American species in alligatorids are the result of host switches.

Daniel R. Brooks "COMMENTS ON THE GONOTYL OF PROCTOCAECUM MACROCLEMIDIS () N. COMB. (DIGENEA: ACANTHOSTOMIDAE: ACANTHOSTOMINAE), WITH A KEY TO THE GENERA OF ACANTHOSTOMINAE AND NEW PHYLOGENETIC TREE FOR PROCTOCAECUM BAUGH, 1957," Journal of Parasitology 90(3), 594-597, (1 June 2004). https://doi.org/10.1645/GE-133R
Received: 30 April 2003; Accepted: 1 November 2003; Published: 1 June 2004
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