Define the redia larva - platyhelminthes, Biology

Assignment Help:

Define the Redia Larva?

Redia is the third larval stage in the life cycle of F. heputicn. Redia develops from the germ cell Is of the sporocyst and comes out of the sporocyst by rupturing tlie sporocyst wall. Redia then migrates to the liver of the snail.

1. Each redia measures about 1.3-1.6 mm in length.

2. Body of redia is elongated, cylindrical and sac-like.

3. Body-wall is composed of tegument, epithelial layer and delicate mesenchyme.

4. Anterior end consists of mouth which leads into a muscular pharynx with pharyngeal glands and sac like intestine.

5. Just behind the pharynx is a muscular ring-like swelling called collar which helps the redia in locomotion.

6. Just posterior to the collar is a permanent aperture called birth pore through Which another generation of redia called second generation of redia or the next larval stage, the cercaria exits to the outside.

7. Posterior region has two stumpy processes called lappets which help the redia
in anchoring to the tissues of the snail and are also helpful in locomotion.

8. The space between the body wall and intestine contains n few germ cells.

9. Germ cells often give rise to second generation of daughter rediae.

10. The germ cells of redia as well as germ cells of daughter redia give rise to the next larval stage called cercaria.


Related Discussions:- Define the redia larva - platyhelminthes

Explain citric acid cycle, Explain citric acid cycle In  the citric aci...

Explain citric acid cycle In  the citric acid cycle, the oxaloacetate is first condensed with acetyl CoA, and  then regenerated  as  the cycle  is  comp!eted.  But these  react

Explain the parathyroid gland cells, A new drug named AGON-CaSR has been de...

A new drug named AGON-CaSR has been developed that is an agonist at calcium-binding sites of CaSRs (Calcium-Sensing Receptors) in plasma membranes of parathyroid gland cells.

Give three examples of artificial selection, Give three examples of artific...

Give three examples of artificial selection. Include examples of both animals and plants.  Answers will vary, but could include domestic cats, domestic dogs, cattle, sheep, an

Common eye defects, COMMO N EYE DEFECTS - 1 .       Glaucoma - Pres...

COMMO N EYE DEFECTS - 1 .       Glaucoma - Pressure of aquous humour is increased, retina is degenerated. 2 .       Presbyopia - Due to non etastic cilliary muscles,

Difference between translation and transcription, Q. What is the difference...

Q. What is the difference between translation and transcription? Transcription is the name given to the formation of DNA molecules from an open DNA chain used as a template, Tr

Avian leukosis (sarcoma group of retroviruses), A v i a n leukosis (Sar...

A v i a n leukosis (Sarcoma group of retroviruses) This is a complex of viral diseases caused by an avian retrovirus with various manifestations such as lymphoid leukosis,

Homo sapiens fossilis (cro-magnon man), Hom o sapiens fossilis (CRO-M...

Hom o sapiens fossilis (CRO-MAGNO N MAN) - Fossils found from Cro-Magnon, France by Mac Gregor (1868) Replaced Neanderthal man about 35.000 years ago Sharp nose

Determine the urine analysis, Determine the Urine analysis Urine consti...

Determine the Urine analysis Urine constituent may be altered in urinary tract infection, systemic disease. However it is not routinely prescribed for most of the potential imp

Plants of dry environment open their stomata only at night, Why do few plan...

Why do few plants adapted to a dry environment open their stomata only at night? Throughout the day in dry habitats the guard cells become the stomata close and flaccid; concur

Bjork-shiley valve (b-s)-types of valves, Bjork-Shiley Valve (B-S) : This...

Bjork-Shiley Valve (B-S) : This is one of the earliest types of tilting disc valves introduced in early 70's. The earlier models like concavo-convex disc valves were withdrawn fr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd