Which tapeworm is the double-pore type?

Which tapeworm is the double-pore type?

• A. Paragonimus kellicotti
• B. Dipylidium caninum
• C. Echinococcus granulosus
• D. Moniezia expansa

Answer: (D)

Double-pore type refers to tapeworms whose mature proglottids have two genital pores, one on each side, through which eggs are released. This arrangement is most famously seen in Dipylidium caninum, the cucumber seed tapeworm that infects dogs and cats. Its proglottids are characterized by having two reproductive openings, a feature that helps distinguish it from other tapeworms. The other organisms listed are not described by this two-pore pattern: Paragonimus kellicotti is a trematode (a fluke) and not a cestode; Echinococcus granulosus is a taeniid with a different pore arrangement; Moniezia expansa is a different cestode without the double-pore characteristic used to identify Dipylidium.

Double-pore type refers to tapeworms whose mature proglottids have two genital pores, one on each side, through which eggs are released. This arrangement is most famously seen in Dipylidium caninum, the cucumber seed tapeworm that infects dogs and cats. Its proglottids are characterized by having two reproductive openings, a feature that helps distinguish it from other tapeworms. The other organisms listed are not described by this two-pore pattern: Paragonimus kellicotti is a trematode (a fluke) and not a cestode; Echinococcus granulosus is a taeniid with a different pore arrangement; Moniezia expansa is a different cestode without the double-pore characteristic used to identify Dipylidium.