Question

Double poured tapeworm of sheep and goats is

• A. Moniezia expansa
• B. Stilesia globipunctata
• C. Moniezia benedeni
• D. Avitellina centripunctata

Hint:

Remember that Moniezia expansa is the "common tapeworm" or "double-pored tapeworm" of sheep/goats, easily distinguished under the microscope by its rosette-shaped interproglottid glands.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Tapeworms of the genus Moniezia are common parasites infecting the small intestine of ruminants like sheep and goats.
Different species are distinguished by their morphological characteristics, including the shape of the interproglottid glands and the duplication of reproductive organs.
Detailed Explanation:
Let us review the characteristics of the tapeworms listed in the options:
- Moniezia expansa: This species is commonly known as the "double-pored" (or "double-poured" due to spelling variations in some exams) tapeworm because each proglottid (segment) contains two complete sets of male and female reproductive organs, with two genital pores opening on either side. It primarily infects young lambs and kids.
- Moniezia benedeni: This species also has double sets of reproductive organs but is wider and mainly found in cattle. Its interproglottid glands are arranged in a continuous line, unlike the rosette-like arrangement in M. expansa.
- Stilesia globipunctata and Avitellina centripunctata: These are other tapeworms of small ruminants but they have different morphological arrangements and do not possess the classic double-pored structure of Moniezia.

Step 2: Final Answer:
The double poured tapeworm of sheep and goats is Moniezia expansa, which corresponds to Option (A).