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BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
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ISBN:9781305967359
Author:STARR
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Chapter16: Evidence Of Evolution
Section: Chapter Questions
Problem 6SA: True or false? Wrinkly textures in rock that formed from ancient biofilms living in marine sediments...
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Figure 1: The phylogenetic tree of the Mysticeti.

QUESTION:

1. Refer on the figure. What morphological traits does the new fossil, Janjucetus hunderi, share with the extant odontocetes?

(not to scale)
Pleist.
Pliocene
Miocene
Oligocene
Eocene
1.8
5.3
Late
11.6
Middle
15.9
Early
23.0-
Late
0
28.0-
Early
Late
34.0-
▬▬▬▬▬
38.0-
Middle
Early
48.6
55.85
Hippopotamus
!
Georgiacetus!
E
Zygorhiza
Odontoceti,
ChMTM®
99(9)
100(35)
macrophagy
(teeth only)
Sana
Janjucetus*
Mammalodon
bulk filter-
feeding
(teeth/baleen)
Chonecetus
Actiocetus
Eomysticetus
57(2)
76(4)
(1)
broad-based rostrum
bulk filter-feeding (baleen only)
Diorocetus
Caperea
92(5)
Pelocetus
100(13)
Eubalaena:
63(4)-
small body size
foreshortened rostrum
fibrocartilaginous mandibular symphysis
94(8)
large body size
edentulous rostrum
baleen
elongated and flattened rostrum
Eschrichtius D
Balaenoptera
54(3)
Transcribed Image Text:(not to scale) Pleist. Pliocene Miocene Oligocene Eocene 1.8 5.3 Late 11.6 Middle 15.9 Early 23.0- Late 0 28.0- Early Late 34.0- ▬▬▬▬▬ 38.0- Middle Early 48.6 55.85 Hippopotamus ! Georgiacetus! E Zygorhiza Odontoceti, ChMTM® 99(9) 100(35) macrophagy (teeth only) Sana Janjucetus* Mammalodon bulk filter- feeding (teeth/baleen) Chonecetus Actiocetus Eomysticetus 57(2) 76(4) (1) broad-based rostrum bulk filter-feeding (baleen only) Diorocetus Caperea 92(5) Pelocetus 100(13) Eubalaena: 63(4)- small body size foreshortened rostrum fibrocartilaginous mandibular symphysis 94(8) large body size edentulous rostrum baleen elongated and flattened rostrum Eschrichtius D Balaenoptera 54(3)
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