Derived Traits of Animals

Question 1

Derived traits at Metazoa (Porifera)

Answer 1

Simple sac-like body, choanocytes

Question 2

Ancestral traits at Metazoa (porifera)

Answer 2

Asymmetry, no tissues, all 7 of the metazoan traits

Question 3

Derived traits at Eumetazoa (cnidaria)

Answer 3

Stinging cnidocytes, body shapes are a sac with a gastrovascular cavity

Question 4

Derived traits at Bilateria

Answer 4

Bilateral symmetry, heads, triploblastic

Question 5

Derived traits at Nephrozoa

Answer 5

True coelom

Question 6

Derived trait at Deuterostomia

Answer 6

Deuterostome development

Question 7

Derived trait at Protostome

Answer 7

Protostome development

Question 8

Derived traits at Spiralia

Answer 8

Groups on genetic similarities

Question 9

Ancestral traits at Spiralia

Answer 9

Bilateral symmetry, protostome development, triploblastic

Question 10

Derived traits of phylum Platyhelminthes (clade spiralia)

Answer 10

Acoelomate, free living in water or parasite, dorsoventrally flattened

Question 11

Derived traits of phylum Rotifera (clade spiralia)

Answer 11

Pseudocoelomate, crown of cilia on head = corona, microscopic, freshwater or marine

Question 12

Derived traits of phylum Mollusca (clade spiralia)

Answer 12

Soft body usually with a shell, radula scraper, mantle

Question 13

Ancestral trait of phylum Platyhelminthes (clade spiralia)

Answer 13

True coelom

Question 14

Derived traits of phylum Annelida (clade spiralia)

Answer 14

Repeated identical segmentation

Question 15

Derived traits of phylum Nematoda (clade Ecdysozoa)

Answer 15

Outer cuticle that’s molted, pseudocoelom

Question 16

Derived traits of phylum Arthropoda (clade Ecdysozoa)

Answer 16

Jointed exoskeleton, chitin exoskeleton, segmented with tagma