Question

explain the morphological features of earthworm​

Answer 1

The important external features are as follows: Shape: Earthworm is elongated, long, narrow, cylindrical or vermiform shaped. The anterior end is tapering while the posterior end is more or less blunt. Body surface: Body consists of dorsal and ventral surfaces.Jun 30, 2016

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Answer 2

Answer :

The morphological features of earthworm include -

• The earthworms have long cylindrical body.
• They are divided into more than hundred short segments called metameres.
• The dorsal surface of its body is marked by dark median mid dorsal line.
• The ventral surface is distinguished by the presence of genital openings.
• The anterior end consist of mouth and the prostomium, a line which serves as a covering for mouth.
• It also acts as a wedge to force open cracks in soil.
• It is also sensory in function.
• The first body segment is called prostomium.
• The segment 14-16 is covered by dark band in a mature earthworm.
• It is basically a glandular tissue called clitellum.
• The body is divisible in three prominent regions called preclitellar, citellar and postcitellar.
• Four pairs of spermathecal apertures are located at 5th - 9th segments.
• The female has a genital pore in the mid ventral region that is 14th segment.
• A pair of male genital pore are present in the ventro-lateral side of 18th segment.
• There are numerous minute pores called nephridiopores on earthworm's body.
• In each segment of body, there are rows of S shaped setae.
• These setae are embedded in the epidermal pits.
• They help in locomotion.