The Eight Phyla of Invertebrates

Give the eight most common phyla of invertebrates
I had to do a little research to come up with this quiz. I don't know if there are other phyla out there, so I just put "most common" in the description. Enjoy~
I added clues to the items to make answering them a little less confusing, I hope.
Quiz by
CtG526
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Last updated: August 1, 2012
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First submittedAugust 1, 2012
Times taken295
Average score62.5%
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Answer
Sponges; represent transition from unicellular to multicellular life
Porifera
Transition through a two-stage life
Cnidaria
Flatworms with symmetrical bodies
Platyhelminthes
Roundworms; first to have a digestive tract with two openings
Nematoda
Members include the starfish and sea urchin
Echinodermata
Segmented worms that have a clear head and tail
Annelida
Have a fluid-filled cavity surrounded by the mesoderm
Mollusca
Exoskeleton, segmented body, and joint legs
Arthropoda
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5 Comments
+1
Level 74
Sep 18, 2012
You should say that it's the Latin name you want. And what about insects and arachnids?
+1
Level 59
Sep 19, 2012
Insects and arachnids are subsets of a phylum arthropoda, if I remember correctly.
+1
Level 38
Dec 11, 2014
Perhaps you should accept nematodes for nematoda
+1
Level 38
Dec 11, 2014
You might also want to add Cycliophora
+1
Level 80
May 26, 2016
Arthropods works, but nematodes and molluscs doesn't. That seems inconsistent.