Which characteristic is unique to Nemerteans and distinguishes them from flatworms?
Understand the Problem
The question asks us to identify a characteristic that is present in Nemerteans (ribbon worms) but not in flatworms. We need to consider the features listed in the options and determine which one uniquely distinguishes Nemerteans.
Answer
Nemerteans have an eversible proboscis in a rhynchocoel, unlike flatworms.
Nemerteans possess a unique structure called an eversible proboscis, housed within a rhynchocoel, which distinguishes them from flatworms.
Answer for screen readers
Nemerteans possess a unique structure called an eversible proboscis, housed within a rhynchocoel, which distinguishes them from flatworms.
More Information
The eversible proboscis is a unique organ that can be extended out from the body, often to capture prey. The rhynchocoel is the cavity that houses this proboscis when it's not in use.
Sources
- Superphylum Lophotrochozoa: Flatworms, Rotifers, and Nemerteans - courses.lumenlearning.com
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