Class notes
class notes
- Course
- Institution
class notes to help guide
[Show more]
Seller
Follow
em30
Content preview
Animal Diversity (Part 3) LectureTextbook Reference: Chapter 44 in Biology How Life Works (2nd ed.)
Section 44.3 and 44.5; pp.963 to 972
Required reading: pp. 963 (starting at Deuterstomes include..) to 966
Deuterostome Tree
• Based on:
Shared features of larval development
Strongly supported by molecular sequence
data
• Deuterostome tree includes three major phyla:
Echinodermata (sea urchins)
Hemichordata (acorn worms)
Chordata (vertebrates and invertebrate
chordates)
Echinoderms Are Deuterostomes:
• Although they may seem to have little in common with phylum Chordata (which
includes the vertebrates) they share deuterostome characteristics:
A cranium that protects a well-developed brain
Pair of eyes
Distinctive mouth for food capture and ingestion
Internal skeleton commonly mineralized by calcium phosphate
1
, Deuterostome diversity:
Phylum Description/Characteristics
Echinodermata - Sea urchins and sea stars
What about echinoderm symmetry? Why are they bilaterians when they look radially
symmetrical?
Hemichordata -sister group to echinoderms
Acorn worms - About 75 species of wormlike
animals that move through
seafloor sediments in search of
food particles
Pterobranchs - Consists of about a dozen
species of animals that attach to
the seafloor and use tentacles to
filter food from seawater
Phylum Chordata
• The other great branch of the deuterostome tree is the
chordates
• Within the phylum Chordata, there are three subphyla:
Cephalochordates
Tunicates
Vertebrates
2
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 or Stuvia-credit 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 em30. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now