Lecture notes
Arthropods I and II
- Module
- Institution
Lecture notes on arthropods (part of bilaterians, molluscs and arthropods)
[Show more]
Seller
Follow
aiswaryamenon
Content preview
Lecture 4: ArthropodsEcdysozoans have a 3 layered cuticle, molted as the animal grows (ecdysis). Arthropods are found in
this group. Arthropods are sister groups to Lobopodia. Arthropods are the most successful group in
terms of species numbers, ecologically and geographically.
Ecdysozoans have a hard, 3 layered cuticle made of chitin. Also found in radula of molluscs and
beaks of cephalopods. It's very hard when cross linked with proteins. It's molted for the organism to
grow.
The cuticle is made of 3 layers:
Epicuticle - water resistant layer of protein, lipoprotein, lipid and sometimes wax.
Exocuticle - scleritised where it needs to be hard, left flexible in other areas. Made of chitin and
protein.
Endocuticle - mostly chitin, often mineralised with calcium
They have chaetae which provides attachment and sensory functions (not same as cilia).
The hormone called ecdysone causes the animal to go through its molt.
The ecdysial line allows the animal to predict what part of the body is going to break open when it
molts. Ecdysozoa are vulnerable during molting because its soft. Cuticle is hardened during
scleritisation. Each molting is called an instar.
Differences between arthropods and humans:
Arthropods develop backwards
Upside down body plan
Has an exoskeleton instead of an endoskeleton.
Key features of arthropods
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller aiswaryamenon. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.86. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
62890 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now
Recently viewed by you
