Well, stylet is very resistant, in reality it is made by more layers of tissue: Labrum, labella etc. (the complex of them is also called fascicle) and in its terminal part is very rigid (to pierce) while in the rest is more elastic.

Also, it is designed to be similar to a needle, so that resistance by the host skin is reduced to minimum thus there is no risk of breaking. 

It is like a needle... a very thin and sharp needle wouldn't break even it was made of crystal, due to the small resistance opposed. Plus, human skin is not as resistant as animals' one, so it is easy for the mosquito to pierce.

Just think that engineers are designing bionic needles based on mosquitoes (The Insect Fascicle Morphology Research and Bionic Needle Pierced Mechanical Mechanism Analysis by Xin et al.)

Dear    Pradeep Kumar Dalal 

Pls. find the attached files and the references, good luck

Hoping this will be helpful to your project

Regards

Prof. Houda Kawas

https://www.cambridge.org/core/journals/bulletin-of-entomological-research/article/stylet-penetration-and-feeding-damage-of-eupteryx-melissae-curtis-hemiptera-cicadellidae-on-sage/20403B1DE658C2954E55A4EC5F40B3B7

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5156713/

https://web.natur.cuni.cz/parasitology/vyuka/LekEnt_CV/The%20Biology%20of%20Blood-Sucking%20in%20Insects.pdf

http://apps.who.int/iris/bitstream/10665/39005/1/Vector_Control_in_International_Health_eng.pdf

https://en.wikipedia.org/wiki/Insect_mouthparts

https://www.uvm.edu/~entlab/Greenhouse%20IPM/Pests&Beneficials/Mouthparts.pdf

http://www.backyardnature.net/insmouth.htm

https://www.britannica.com/science/stylet

Also

https://plantmethods.biomedcentral.com/articles/10.1186/1746-4811-9-18

http://www.biosciences-labs.bham.ac.uk/pritchard/techniqu.htm

http://link.springer.com/article/10.1007/BF01874855

http://link.springer.com/article/10.1007/BF00394567

https://www.ncbi.nlm.nih.gov/pubmed/24253836

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC440496/pdf/plntphys00522-0113.pdf

http://plantsinaction.science.uq.edu.au/content/522-techniques-collect-phloem-sap

http://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_45-46/010006644.pdf

https://figshare.com/articles/_Collection_of_phloem_sap_with_the_laser_aphid_stylet_technique_/917911

Article Fine structure of aphid stylet routes in plant tissues in co...

Article A guide to use of the exuding-stylet technique in phloem physiology

thanks to Umberto Platini and Houda Kawas for your esteemed reply 

You most welcome

Houda

37

Hi Pradeep

There are several references in attachment 1

https://extension.umaine.edu/ipm/ipddl/publications/5039e/

2

http://www.jsw.org.au/elearning/hortIII/Provide%20information%20on%20plants%20and%20their%20culture/resources/visitor_centre/how_to/mouthparts.htm

3

https://pest.ca.uky.edu/EXT/master_gardener/entbasics/mouthparts/mouthparts.shtml

4

https://citybugs.tamu.edu/factsheets/landscape/sapfeed/

5

https://www.uvm.edu/~entlab/Greenhouse%20IPM/Pests&Beneficials/Mouthparts.pdf

6

http://extension.missouri.edu/p/mg12

7

http://aggie-horticulture.tamu.edu/galveston/Gardening_Handbook/overview/Handbook-G_insect_mouthparts.htm

8

http://gardeningsolutions.ifas.ufl.edu/care/pests-and-diseases/pests/management/different-pests-different-damage.html

9

https://digfieldschool.org/wp-content/uploads/2014/05/Lesson-10D-Insects-Questions.pdf

10

https://repository.si.edu/bitstream/handle/10088/5969/AR_Ecology_Sys_1997.pdf