Explain the Dipleurula concept and Echinoderm theory related to the origin of chordates.
Understand the Problem
The question is about providing information related to the origin of chordates, specifically focusing on the Dipleurula concept and the Echinoderm theory. These concepts are related to evolutionary biology and attempt to explain the evolutionary origins of chordates (the phylum including vertebrates) from earlier deuterostome ancestors.
Answer
The Dipleurula concept describes a hypothetical echinoderm larva. The Echinoderm theory proposes chordates originated from invertebrates, sharing an ancestor with echinoderms.
The Dipleurula concept refers to a hypothetical larva of ancestral echinoderms, serving as a base for larval forms of eleutherozoans. The Echinoderm theory suggests chordates originated from invertebrates, potentially sharing a common ancestor with echinoderms and hemichordates due to similarities in embryonic development.
Answer for screen readers
The Dipleurula concept refers to a hypothetical larva of ancestral echinoderms, serving as a base for larval forms of eleutherozoans. The Echinoderm theory suggests chordates originated from invertebrates, potentially sharing a common ancestor with echinoderms and hemichordates due to similarities in embryonic development.
More Information
The precise invertebrate group from which chordates evolved is still under debate, in part because the ancestors were soft-bodied, making fossil evidence scarce.
Tips
A common mistake is to assume the Dipleurula is an actual, existing larva, rather than a hypothetical ancestral form.
Sources
- Dipleurula concept and the Echinoderms theory of origin of chordates - quizgecko.com
- Origin of Chordates - Dipleurula concept, Echinoderm theory - biologynotesonline.com
- Origin of chordates | Zoology for IAS, IFoS and other competitive ... - iaszoology.com
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