Skip to main content

Herdmania : Retrogressive Metamorphosis , Characteristics | Biology Blog

                       Metamorphosis In Herdmania




Metamorphosis is the biological process in which an organism starts to develops physically after birth or hatching. During the development, the organism's body starts to develop inits original or mature form, and the habit also starts to develop. There are numerous examples of metamorphosis Like tadpole that grows and changes into  Adult Frog. The young of such are called larvae. 
Retrogressive Herdmania Diagram

The juvenile swimming larva that Herdmania gives birth to has characteristics like the notochord, dorsal neural tube, and specific sensory organs. After metamorphosing, this swimming larva becomes an adult, and distinctive traits change along with it. The adult one has characteristics like a pharynx with stigmata and an endostyle, which reveal that it is a chordate. Retrogressive metamorphosis is the name given to this type of metamorphosis, which exhibits deterioration from larva to adult.


Retrogressive metamorphosis takes place in two ways -  

Retrogressive Changes - Retrogressive changes involves degeneration of larval character and disappearance of the following structure - 

  • The long tail with caudal fins of larva slowly becomes small and finally disappears.

  • Caudal muscles and nerve chord disappear. 

  • The notochord also disappears.

  • Sense organs and sensory vesicles degenerated.
Tadpole Larva Of Herdmania

Progressive Changes - In the progressive changes some larval structures of Herdmania elaborate and specialized in adult form, like -
  • The trunk becomes pear-shaped by loss of tail and four large ampullae grows out of its four corners and two smaller ectodermal ampullae appear dorsoventrally.

  • Feeding starts with incoming ciliary water current.

  • The atrial cavity becomes extensive.

  • The neural and nerve ganglion comes between mouth and atripore.

  • The heart develops.

  • The liver develops, intestine develops, and guts become curved.

  • Gonads and gonoducts arise from the mesodermal cells. 
 
 
Herdmaia L.S




Features Of Herdmania -

  • Herdmania's cylindrical or oval body is covered by a tunic that shields and covers its internal organs.

  • Herdmania adults can grow as long as 10 cm.

  • Herdmania might be green, yellow, brown, or even gray.

  • Herdmania is a filter feeder, which means that it consumes minute particles floating in the water.

  • The Herdmanian larvae are free-swimming and resemble tadpoles.

  • Herdmania have sticky papillae that aid in substrate attachment.

  • Herdmania possesses both male and female reproductive organs, making it a hermaphrodite.

  • Herdmania is capable of asexual reproduction through budding.

  • As Herdmania is sensitive to pollution and changes in the environment, it is employed as a bioindicator of water quality.

 
Labels:

Comments

Post a Comment

Popular posts from this blog

Sycon Canal System With Diagram

                                     Canal system in Sycon  A sea creature called a sycon, or scypha , is usually found clinging to rocks or other surfaces. These creatures have tube-shaped bodies that open outward with the help of a hole called an Osculum . They have tiny openings called Spiracles and Ostia all over their bodies to let water in. This water flows through canals inside their bodies and comes out through the Osculum, which is a larger opening used for breathing. We'll observe the shape of this canal system, why it is essential for those animals, type of canal system , and  its significance. The Sycon Type Canal system is the unique feature of the phylum Porifera . This system is also known as the  aquiferous canal system . This system supports the significant function of the body like nutrition, respiration, excretion, etc. History Overview -  Gran...
13 comments
Read more

Whittaker's Five Kingdom Classification | Biology Blog

                                   Five Kingdom Classification Early biologists classified all species as either plants or animals. Since this method makes it difficult to research specific creatures, American taxonomist R.H. Whittaker created the five-kingdom classification in 1969. This system divides all organisms into groups based on how they are organized and how they are fed. Important standards for this classification include - The complexity of cell structure i.e. Prokaryotic and Eukaryotic. The complexity of the Organisms body is Unicellular and Multicellular. Mode of nutrition Autotrophs and Heterotrophs. Lifestyle. Phylogenetic Relationship. Based on these criteria, Whittaker classified the living world into the following categories  - Kingdom Monera                 Kingdom Protista Kingdom Fungi Kingdom Animalia Ki...
1 comment
Read more

Aurelia Aurita Life Cycle: Characterstics, Classification

                                             Aurelia  Aurelia aurita is a type of zooplankton found all over the world. They are see-through and don't have eyes, brains, or hearts. They're usually between 2 to 15 inches wide. Even though they prefer being alone, they get carried together in groups called Blooms by wind and water currents. At night, they look like they're moving through the water like jellyfish, which is why they're sometimes called " jellyfish ".  They have four reproductive organs surrounded by tentacles in their top part. Their body color changes based on what they eat, so they can be blue, pink, or other colors. Let's learn more about Aurelia in detail. Details Of Aurelia Diagram -  Body : The center of the diagram would display the jellyfish's bell-shaped body, often called the " umbrella. " Tentacles : Below the bell, you'd see lon...
1 comment
Read more