Earthworms

Kingdom: Animalia

Phylum: Annelida

Class: Oligochaeta

Order: Opisthopora

Genus: Pheretima

Species: posthuma

Morphology  

The term morphology deals with the study of the forms and therefore, the external structures of any living organism which has the dimensions, form, and structure. 

There are 3 main sorts of morphology.

Cellular morphology 

Tissue morphology 

Organ morphology 

Animal morphology is healthier explained with the samples of earthworms. 

Earthworm morphology 

Earthworm may be a terrestrial invertebrate that is brownness in color that lives in the higher layer of dampish soil. 

For example- Pheretima and Lumbricus. 

Body form

They have long cylindrical body divided into segments known as meta meres. 

The ventral surface contains sex organ pore and dorsal surface contains middle dorsal line. 

The first body phase {is known as|is named|is termed} peristpmium that contain mouth and fourteen — sixteen segments Greek deity lined by dark band called clitellum. 

Genital pore single feminine sex organ pore is present on middle ventral line of ordinal phases, and a try of male sex organ pore is gift on eighteenth segment on ventrolateral aspect. 

Locomotion 

All the phase except first, last and ciltell contain s formed setae for locomotion. 

Alimentary canal 

It is straight tube from first to last phase having, bodily cavity, muscular pharynx, oesophagous that cause gizzards. 

It facilitates in grinding the soil particle and decaying leaves. 

Stomach and tiny intestine results in orifice.

 Blood Vascular system 

Closed system consists of heart, blood vesicles and capillaries. 

On the 4th, fifth, and sixth segments, blood glands are present that manufacture blood cells and haemoglobin that is dissolved in plasma. 

Nervous system 

It is portrayed by ganglia organized phase wise on the ventral paired nerve twine. 

The nerve twine present within the anterior region (3rd and fourth segments) bifurcates and joins the cerebral ganglia dorsally to create a nerve ring. 

Reproduction 

Two pairs of sex gland are present in tenth, and eleventh segment and on eighteenth phase prostrate and gamete duct hospitable surface as male sex organ pore. 

One try of ovary is hooked up to the intersegmental septum of twelfth and thirteenth segments. 

Feminine sex organ pore open on ventral aspect of fourteen the phases. 

Mutual exchange of sperm cell takes place throughout conjugation. 

The excretory system: 

Excretory organs is coiled segmental tubules known as nephridia. 

There are 3 sorts of nephridia. 

They are Septal nephridia Integumentary nephridia Pharyngeal nephridia Fertilization Mature sperm cell and egg cells beside nourishing materials are deposited in cocoon within the soil wherever fertilization takes place.