This week's case features photos and videos from my lab, courtesy of Ms. Heather Morris and Felicity Norrie. The following object (which was still moving!) was submitted for identification. No history was provided, unfortunately. What do you think it is? (Be as specific as possible). What additional steps could you take to confirm your presumptive identification?
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ReplyDeleteBest I can do is probable Diphyllobothriid tapeworm - would need genetic sequencing to be more specific.
ReplyDeleteCraspedote proglotids with central line of uteri point towards Diphyllobothrid tapeworm.
ReplyDeleteFlorida Fan
Central uterus, cestode, Diphyllobothrium latum ?
ReplyDeleteVery beautiful pictures and cool video material!
ReplyDeleteI agree: the proglottids of this tapeworm are gravid - the brown central points represent large numbers of dark eggs concentrated in a centrally positioned uterus.
As the gravid proglottids are craspedote and wider than they are long, this points towards a Diphyllobothriid tapeworm (possibly Dibothriocephalus).
An easy way to confirm this is to cut open a proglottid and expell some of the typical eggs. But for exact species determination, molecular tools should be deployed.
Common names zipper worm, broad tapeworm or fish tapeworm. Will need molecular sequencing to identify to a species level.
ReplyDeleteI agree that this is a diphyllobothriid tapeworm. We used to called them all Diphyllobothrium latum. Molecular studies have now demonstrated that there are several different species and in fact genuses that are not easily distinguished morphologically. Dibothriocephalus lotus (formerly D Tatum) is most likely if the organism was acquired near Mayo. Dibothriocephalus nihonkaensis is more common in Japan and north east Asia. Adenocephalus pacificus would be more common in Peru. There are also others.
ReplyDeleteDibotriocephalus latum
ReplyDeleteLooks like Diphyllobothrium latum though I am a novice.
ReplyDeleteagree , the dark ones are the rosette uterus of D latum the longset cestode in humans
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