All UK Exam Boards included

Arthropoda (e.g. insect) body form

Download Topic

Arthropods including insects and arachnids are characterised by their jointed limbs and bilateral symmetry with a fixed number of metameric segments e.g. head, thorax, abdomen.

They have both a mouth and an anus as part of a digestive tract with specialised regions (the caecae are appendages that contain gastric juice). The arthropod body form has enabled vast diversification of this animal group, including flight i.e. because the extra limbs could change without affecting the function carried out by the rest.

 

Their outer body is supported via the exoskeleton, which is a strong chitin structure.

 

 

This has led to arthropods, more specifically insects, dominating other animals in terms of highest number of different species as well as overall number of individuals. Extensive evolutionary potential was encased in this body form, giving rise to the most diverse animal group on the planet.

 

 

 

 

Sorry! There are no posts.

Sorry! There are no posts.

Your Reviews

OMG them videos are great! You're a goldmine - and I'm a gold digger ;)

sc12 YouTube

Thank you for making all the content btw!

Serena Kutty YouTube

Just a huge thank you for spending your time helping others. I love your site and I'm seriously very grateful. No word of a lie

Neuron13 The Student Room

Hi! I have recently finished my first year doing biology at uni and I subscribed to you back when I was doing AQA A levels (glad I don’t live in Wales after watching this vid lol) and you and your website helped me so much. Just wanted to say it’s so nice to see you

Mr Peanutbutter YouTube

wow just checked out your website and think it’s pretty cool.

Eager bug The Student Room