Question

State the connecting link between peripatus with Annelida and Arthropoda?

Answer 1

Hint: A link is an organism with the characteristics of two different groups of organisms. The peripatus is of particular concern because the body has certain structures characteristic of annelids and other structures found only in arthropods. Hence, they are considered to be an intermediate or intermediate link between annelids and arthropods.

Complete answer:
Let’s first of all we study the characters of peripatus.
> Peripatus- Predators, ancestral and nocturnal arthropods, are commonly found in rock crevices, under rocks, and in trees in humid tropical regions. The body is cylindrical and long, without any segmentation or exoskeletons. Head is absent but at the front end there is a pair of segmented antennae, a pair of jaws, a pair of eyes, and a pair of oral nipples with mucous glands below. On the sides of the body there are about 14 pairs of irregular and disturbing movements. Removal of waste occurs through Nephridia. Most of them are viviparous and sexes are separate.
These fossils, called living fossils, serve as a link between annelids and arthropods and have the following similarities:
Annelids characters:
> The presence of a pair of Nephridia.
> The presence of a direct digestive tract.
> The presence of steep and undivided slopes.
> Having simple eyes.
 Arthropods characters:
> The presence of chitinous cuticles
> The presence of jaws
> The presence of antennae
> The presence of an tracheal system

Note:
Given these anatomical features, Grube (1874) places the group in the Annelids group, and it appears that the onychophora descended from the Annelids, if not directly from the Annelids, belonging to the ancient tribe that developed. There is no doubt that, according to Sedgwick (1908), Peripatus belongs to arthropods for all the above-mentioned features of morphological significance. The development possibilities of the Peripatus confirm the prospect. Gilding (1826) was first discovered by the Peripatus and is considered an annoying mollusc. However, according to many scientists, the similarity with molluscs is only superficial.