Question:

Peripatus is a connecting link between

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Peripatus belongs to the phylum Onychophora, which shows characters of annelids as well as arthropods. As a result of its resemblance with two different phyla, Peripatus is often referred to as connecting link between them. This shows important morphological and anatomical evidence of evolution.

Updated On: May 5, 2024
  • mollusca and echinodermata
  • annelida and arthropoda
  • coelenterata and porifera
  • ctenophora and platyhelminthes
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The Correct Option is B

Solution and Explanation

Peripatus is a connecting link between annelida and arthropoda.

Peripatus belongs to the phylum Onychophora. It can be defined as a primitive arthropod, like other arthropods, having jointed paired legs, compound eyes, and tracheas but also shows certain annelidan characteristics, like worm-like segmented body, non-chitinous cuticle and segmental nephridia.

Some of the Annelidan characteristics of Peripatus are:

1. Presence of simple eyes.

2. Presence of thick cuticle. 

3. Body is pseudosegmented and worm-like.

4. An excretory organ is nephridia.

Some Arthropod characteristics of Peripatus are:

1. Presence of antennae.

2. The trachea forms the respiratory organ.

3. Presence of clawed and pseudosegmented walking legs.

Therefore, the correct answer is option B.

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Concepts Used:

Evolution

Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.