Chordata and Chaetognatha Quiz

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Questions and Answers

What is the primary diet of Chaetognatha species?

  • Small fish
  • Plankton
  • Plant matter
  • Copepods (correct)

Which anatomical feature is NOT present in the posterior region of Chaetognatha?

  • Tail fin
  • Spines
  • Circular musculature (correct)
  • Segmented body

In which geological period did the Chaetognatha originate?

  • Jurassic
  • Ordovician
  • Cambrian (correct)
  • Devonian

Which characteristic is NOT associated with Chordata?

<p>Tripartite coelom (C)</p> Signup and view all the answers

How many species of Chaetognatha are approximately recognized?

<p>190 (C)</p> Signup and view all the answers

Which of the following statements regarding the phylogenetic position of Chaetognatha is true?

<p>Their relationship to rotifers and protostomes is suggested by Hox gene analysis. (B)</p> Signup and view all the answers

What feature is characteristic of the subphylum Pterobranchia?

<p>Unique larval morphology (A)</p> Signup and view all the answers

Which of the following groups is classified within the Deuterostomia subgroup of the Chordata?

<p>Echinodermata (C)</p> Signup and view all the answers

What does the 'Posición filogenética incierta' refer to?

<p>Uncertain phylogenetic position (C)</p> Signup and view all the answers

Which structure is indicative of the relationships displayed in the phylogenetic tree of Chordata?

<p>Dorsal nerve cord (A)</p> Signup and view all the answers

Flashcards

Phylum Chordata

The main group of animals that includes vertebrates and other related organisms.

Notochord

A flexible rod-like structure that provides support in chordate embryos.

Enteropneusta

A group of acorn worms (a type of hemichordate) closely related to chordates.

Pterobranchia

A group of marine chordate animals with reduced gill slits

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Deuterostomia

Subgroup of Chordata, including Echinodermata and Hemichordata, and Chordates

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Chaetognatha Phylum

A phylum of marine animals, commonly known as arrow worms. They are predators that primarily feed on copepods.

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Arrow Worm Habitat

Exclusively marine environments, often abundant in specific locations.

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Arrow Worm Diet

Predators; mainly feed on copepods.

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Arrow Worm Body

Elongated, segmented body with a coelom (body cavity), visible mouthparts, and spines for prey capture; lacking circular musculature in the posterior region.

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Arrow Worm Phylogenetic Position

Historically grouped with deuterostomes, but recent analyses based on Hox genes suggest a relationship with rotifers and protostomes.

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