Question:
Which hypothetical larva is considered as the ancestor of all Echinoderms?
Which hypothetical larva is considered as the ancestor of all Echinoderms?
Show Hint
Dipleurula is a theoretical bilateral larva representing the common ancestor of echinoderm larval types.
Updated On: Jun 19, 2026
- Pentacrinoid
- Bipinnaria
- Echinopluteus
- Dipleurula
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding Echinoderm development.
- Echinoderms are marine invertebrates including starfish, sea urchins, and sea cucumbers.
- Their larvae undergo indirect development with planktonic stages.
Step 2: Concept of ancestral larva.
- Dipleurula is a hypothetical, bilateral, ciliated larva proposed as the ancestor of all echinoderms.
- It represents the basic larval body plan from which different echinoderm larvae evolved.
Step 3: Comparison with other larvae.
- Pentacrinoid: a larval form of crinoids.
- Bipinnaria: larval stage of starfish, derived from Dipleurula.
- Echinopluteus: larval form of echinoids (sea urchins), derived.
Step 4: Significance of Dipleurula.
- Shows bilateral symmetry; adult echinoderms are pentaradially symmetrical.
- Provides evolutionary link for larval forms across classes.
Step 5: Conclusion.
Hence, Dipleurula is considered the ancestor of all echinoderm larvae.
- Echinoderms are marine invertebrates including starfish, sea urchins, and sea cucumbers.
- Their larvae undergo indirect development with planktonic stages.
Step 2: Concept of ancestral larva.
- Dipleurula is a hypothetical, bilateral, ciliated larva proposed as the ancestor of all echinoderms.
- It represents the basic larval body plan from which different echinoderm larvae evolved.
Step 3: Comparison with other larvae.
- Pentacrinoid: a larval form of crinoids.
- Bipinnaria: larval stage of starfish, derived from Dipleurula.
- Echinopluteus: larval form of echinoids (sea urchins), derived.
Step 4: Significance of Dipleurula.
- Shows bilateral symmetry; adult echinoderms are pentaradially symmetrical.
- Provides evolutionary link for larval forms across classes.
Step 5: Conclusion.
Hence, Dipleurula is considered the ancestor of all echinoderm larvae.
Was this answer helpful?
0
0
Top AP EAPCET Biology Questions
- In which group of algae are food materials stored in pyrenoids?
- Which plant hormone is responsible for apical dominance?
- The genetic material in bacteriophages is:
- Which of the following is the structural and functional unit of the kidney?
- Which of the following organisms exhibits alternation of generations?
View More Questions
Top AP EAPCET Classification of animals Questions
- Identify the wrong statement regarding ICBN:
- The branch of botany which helps in understanding the course of evolution in plants is:
- Following is not a common feature in both ferns and Gymnosperms:
- Some plants of the following family have swollen leaf base:
- Choose the incorrect statement:
View More Questions
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions