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The Florida amphioxus (Cephalochordata) hosts larvae of the tapeworm Acanthobothrium brevissime : natural history, anatomy and taxonomic identification of the parasite
Author(s) -
Holland Nicholas D.,
Campbell Terry G.,
Garey James R.,
Holland Linda Z.,
Wilson Nerida G.
Publication year - 2009
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.2008.00343.x
Subject(s) - biology , sucker , anatomy , larva , zoology , genus , ecology
Plerocercoid larvae of a tapeworm are frequently found in the hindgut lumen of the Florida amphioxus ( Branchiostoma floridae ) in central west Florida. About three‐quarters of the adult amphioxus are parasitized. On average, each adult amphioxus hosts about five tapeworm larvae. The residence time of the parasites in the amphioxus gut appears to be in the order of several months, which is considerably shorter than the potential lifetime of the host. The living larvae range in length (when fully extended) from 300 to 850 µm and are approximately cone‐shaped, tapering to a point posteriorly and bearing a single large sucker anteriorly. Toward the anterior end of the body are four hookless bothridia, each indented by three loculi plus an inconspicuous accessory sucker. The larvae initiate the early stages of hook formation when they are cultured for a few days in urea‐saline (mimicking the gut fluid of the definitive host, which is an elasmobranch). The tapeworm larvae are identifiable to genus and species on the basis of correspondences between their nuclear ribosomal DNA genes and those of adult specimens of Acanthobothrium brevissime recovered from the spiral valve of a stingray from the same environment.