Crustaceans and Echinoderms: August 10th-13th

IMG_6373

The phyla we are looking at this week say it all in their names- echinoderm means spiny skin, while arthropod (the group that crustaceans are part of) means jointed appendages.  During our trip to Pat Bay we hope to find some of the member species, from barnacles to sand dollars, and learn about their adaptations and habits.

August 10th

August 11th

August 12th

August 13th

From seining to skits its been a wonderful week! I hope everyone enjoyed learning about some of the most numerous and celebrated marine inhabitants. Understanding what species are related, where they get their names and why they have certain characteristics gives us all sorts of information to share and the background to learn more about each group of animals.

To review:

ECHINODERMS are invertebrates with a hard exoskeleton and, often, sharp protrusions. They frequently have five-part symmetry like a star, and use a water vascular system for structure and circulation. Most move using tiny tube feet with suction cups. They are only found in marine environments.

IMG_6621

CRUSTACEANS are a group of arthropods that are biramous, meaning they have branched limbs and complex larval stages. Like other arthropods, they have an exoskeleton they have to molt as they grow, and their many jointed limbs and segments have evolved to accomplish specific tasks, like claws (chelipeds) for crushing and cutting and mandibles for grabbing and eating.

IMG_6598

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s