bulk filter-feeding (baleen only) (not to scale) Pleist. 1.8 Pliocene 5.3 Late bulk filter- macrophagy (teeth only) feeding (teeth/baleen) 11.6 Middle 15.9 Early 54(3) 23.0- Late 28.0- 63(4)- 194(8) Early 76(4 100(13) large body size Ledentulous rostrum 92(5)- 34.0- baleen elongated and flattened rostrum Late 99(9) small body size foreshortened rostrum fibrocartilaginous mandibular symphysis 38.0- Middle broad-based rostrum 48.6 Early 55.8 100(35) Figure 1. The phylogenetic tree of the Mysticeti. Question 2. List three synapomorphies shared by the extant filter-feeding whales. Eocene Oligocene Mioсene CHMTM
Microscopic examination
The analysis of minute organisms, cellular organization of any biological structure, and composition of body fluids with the help of a microscope is known as microscopic examination. The magnification of specimens or samples under study helps in attaining a clearer picture of it.
Gram Staining
Named after Hans Christian Gram, a Danish bacteriologist, Gram stain is one of the most powerful staining techniques within microbiology. This technique was introduced in 1882 to identify pneumonia-causing organisms. The Gram staining technique uses crystal violet or methylene blue as primary staining colors to distinguish gram-positive from gram-negative organisms. Under a microscope, the gram-positive organisms appear purple-brown, retaining the primary color. Gram-negative organisms appear pink or red as they do not acquire the color of the primary stain.
![bulk filter-feeding (baleen only)
(not to scale)
Pleist.
18
Pliocene
5.3
Late
bulk filter-
macrophagy
(teeth only)
feeding
- (teeth/baleen)-
11.6
Middle
15.9
Early
54(3)
23.0-
Late
28.0-
63(4)-
194(8)
100(13)
92(5)
Early
76(4)
large body size
edentulous rostrum
34.0-
baleen
elongated and flattened rostrum
Late
99(9)
38.0-
Middle
small body size
foreshortened rostrum
fibrocartilaginous mandibular symphysis
broad-based rostrum
48.6
Early
55.8
100(35)
Figure 1. The phylogenetic tree of the Mysticeti.
Question 2. List three synapomorphies shared by the extant filter-feeding whales.
Oligocene
Miocene
Zygorhiza
CHMTM](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F03ebe0c2-4626-4a21-a601-bf6e0c84929f%2Fd7b718d1-82ae-4ff7-8fe4-fa2e60d14efd%2Fnmrgbij_processed.jpeg&w=3840&q=75)
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