Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

13 Cards in this Set

  • Front
  • Back
Name the two types of Symmetry
Radial - Can make multiple mirror images (Sponge)

Bilateral - Dorsal Ventral Axis (Lobster)
Tissue Layers?

Animals with a muscle tissue layer are...
Triploblastic - Mesoderm, Endoderm, Ectoderm

Dipoblastic - Ectoderm and Mesoderm

Animals are tripoblastic
Body Cavities

What does the mesoderm determine?
Are only found in tripoblastic animals

Coelom - Allows for the movement from the outside to not affect the inside.

Mesoderm determines in you have a body cavity - coelem
Describe an Acoelomate
Lacks a body Cavity, one internal space which is a digestive cavity
Platyhelminthes are...

What is a lophophore
Flatworms with a gastrovascular cavity.
Lack Lophophore.

Lophophore is a horshoe shaped suspension feeding organ
Bilateria all have

Turbellarian have
Bilateral Symmetry and triploblastic development

Light sensitive eyespots and centralized nerve nets
What is difference btw Protosome and Deuterosomes?
Blastopore is the first opening to become mouth then followed by anus

Deuterosomes - Anus to mouth

Have Lophophore - Shells are dorsal and ventral -

Segmented Worms, made of series of fused rings
Triploblastic Coelomates

Which is not a molluscs
Snails, Clams and Cephalopods
Softbodied animals sometimes protected by a hard shell. Body consists of muscular foot, visceral mass and a mantle.

Brachiopod is not a mollusc

Include: Chitons, Gastropods, Bivalves, Cephalopods
Nematoda -

They are part of Ecdysozoans, what does this tell us?
These are roundworms
Nonsegmented pseudocoelomates.

Tough cuticle surrounds them made of chitin (Exoskeleton) - Process of Ecdysis in which they molt.
Echinoderms -

Where are these Bilateral? What stage?
They have radial anatomy developed from bilateral symmetry of ancestors.

They are deuterosomes that are bilateral in their larval stage.

They have two special features? Why can't they get bigger?
Segmented Coelomates with exoskeleton and jointed appendages

Their appendages have gone through evolution for - Open circulatory system and gas exchange

Invertebrates are limited in size due to exoskeleton and circulation system (Pipe is not as strong if it gets bigger thing)

Urochordates are lacking what?
Share many features of embryonic development with echinoderms. They have muscular post anal tail. Vertebrata is a sub phylum. They have dorsal nerve cord, and muscular post anal tail. NOTOCHORD distinguishes it, and gills and slits in pharynx

Humans belong to the phylum chordata and therefore are deuterostomes.

They lack a vertebrae