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  • The name of ciliated larva of hemichordates isOption: 1 Muller's larvaOption: 2 Planula

The name of ciliated larva of hemichordates is

Option: 1

Muller's larva


Option: 2

Planula larva


Option: 3

Tornaria


Option: 4

Trochophore


Answers (1)

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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 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
  • Examples: Balanoglossus, Saccoglossus

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Tornaria larva of hemichordates is planktonic and similar to the bipinnaria larva of echinoderms. They have a convoluted band of cilia.

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vishal kumar

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