Laboratory Exercise 8: Animals I: Porifera, Cnidaria,
Ecdysozoa, and one Lophotrochozoan: Platyhelminthes. AMG 21Oct23
Study Guide 2: Learn the organisms.
This is a Word document and will expand as you fill it in.
Table 1. Pattern of increasing complexity. For each of the groups below,
complete the table and identify the evolutionary pattern of increasing complexity.
Phylum Multicellular: True Type of Germ layers: If more Kind of
Yes Tissues: symmetry: One layer than one development:
No Yes Asymmetrical Diploblastic layer, Protostome
No Radial Triploblastic which are Deuterostome
Bilateral present?
Endoderm
Mesoderm
Ectoderm
Porifera yes no asymmetry none none none
Sponges
Cnidaria yes yes radial diploblastic ecto/endo none
Ecdysozoa yes yes bilateral triploblastic ecto/endo/ proto
Arthropoda meso
Ecdysozoa yes yes bilateral triploblastic ecto/endo proto
Nematoda
Roundworms
Lophotrochozoa yes yes bilateral triploblastic ecto/endo proto
Platyhelminthes
Flatworms
, Find the sponges, cnidarians, flatworms, roundworms, and arthropods on the tree above.
Which trait is present in all animals? multicellularity
Which 2 traits are present in cnidarians? radial symmetry AND two germ layers
Which 3 traits are present in flatworms, roundworms, and arthropods? protostome development, bilateral
symmetry, and true tissues/germ layers.
Which trait is present in arthropods and annelids, but not round or flatworms (see bar above)? segmented
Ecdysozoa, and one Lophotrochozoan: Platyhelminthes. AMG 21Oct23
Study Guide 2: Learn the organisms.
This is a Word document and will expand as you fill it in.
Table 1. Pattern of increasing complexity. For each of the groups below,
complete the table and identify the evolutionary pattern of increasing complexity.
Phylum Multicellular: True Type of Germ layers: If more Kind of
Yes Tissues: symmetry: One layer than one development:
No Yes Asymmetrical Diploblastic layer, Protostome
No Radial Triploblastic which are Deuterostome
Bilateral present?
Endoderm
Mesoderm
Ectoderm
Porifera yes no asymmetry none none none
Sponges
Cnidaria yes yes radial diploblastic ecto/endo none
Ecdysozoa yes yes bilateral triploblastic ecto/endo/ proto
Arthropoda meso
Ecdysozoa yes yes bilateral triploblastic ecto/endo proto
Nematoda
Roundworms
Lophotrochozoa yes yes bilateral triploblastic ecto/endo proto
Platyhelminthes
Flatworms
, Find the sponges, cnidarians, flatworms, roundworms, and arthropods on the tree above.
Which trait is present in all animals? multicellularity
Which 2 traits are present in cnidarians? radial symmetry AND two germ layers
Which 3 traits are present in flatworms, roundworms, and arthropods? protostome development, bilateral
symmetry, and true tissues/germ layers.
Which trait is present in arthropods and annelids, but not round or flatworms (see bar above)? segmented
