Phylum Hemichordata MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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EASYThe heart in hemichordata is
Members of Hemichordata are?
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Phylum Hemichordata - Characteristics Features
- These are marine worm-like animals.
- They bear a resemblance to the chordates in having pharyngeal gill slits.
- They also bear a resemblance to the phylum Echinodermata.
- They show the following characteristic features:
- They have an unsegmented body with organ system level of body organization
- They are triploblastic, coelomate and bilaterally symmetrical
- The body is divided into three parts as: proboscis, collar and trunk
- The proboscis has a buccal diverticulum or stomochord. It was earlier considered as notochord.
- They have an open type of circulatory system
- Gills are used for respiration
- Proboscis gland is the excretory organ
- They are dioecious. Fertilization occurs externally and development is indirect
- These are commonly known as Acorn worms or Tongue worms due to shape of proboscis
- Examples: Balanoglossus, Saccoglossus
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