Respected Sir,

Here are some references, which might be helpful for oyu.

1. Recognition of Chitin and Proteins in Invertebrate Cuticles Using Analytical Pyrolysis/Gas Chromatography and Pyrolysis/Gas Chromatography/Mass Spectrometry.

https://www.researchgate.net/publication/14253305_Recognition_of_Chitin_and_Proteins_in_Invertebrate_Cuticles_Using_Analytical_PyrolysisGas_Chromatography_and_PyrolysisGas_ChromatographyMass_Spectrometry

2. The cuticle of the Aplacophora and its evolutionary significance in the Mollusca.

https://www.researchgate.net/publication/230013207_The_cuticle_of_the_Aplacophora_and_its_evolutionary_significance_in_the_Mollusca

3.  Advances in mollusc sclerochronology and sclerochemistry: tools for understanding climate and environment.

http://link.springer.com/article/10.1007/s00367-008-0108-4

Article Recognition of Chitin and Proteins in Invertebrate Cuticles ...

Article The cuticle of the Aplacophora and its evolutionary signific...

Yes

Thanks