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1. What links all of the xenarthrans together as a monophyletic group? reduced a

ID: 147915 • Letter: 1

Question

1.

What links all of the xenarthrans together as a monophyletic group?

reduced articulations of the vertebrae

xenarthran articulations of the vertebrae

edentate skulls

tribosphenic teeth

2.

____________________________ are distinguishing features of the Cingulata.

Bony scutes

Large incisors

Reduced lingual supports

Symbioses with algae

3.

In examining the skull of the anteaters (Vermilingua), what does the reduction of the zygomatic arch tell you?

expansion of jaw musculature

reduction in tongue musculature

reduction in jaw musculature

expansion of eye musculature

a.

reduced articulations of the vertebrae

b.

xenarthran articulations of the vertebrae

c.

edentate skulls

d.

tribosphenic teeth

Explanation / Answer

1.

2.

3.