Mammalian evolution began with the evolution of the first synapsids. What is the defining synapomorphy of synapsis?

a. the possession of the amniotic egg

b. a single temporal fenestra

c. the dentary squamosal joint

d. respiration with a diaphragm

e. endothermic metabolism

Question

Lucian Lewis

Biology

31 March, 02:30

Mammalian evolution began with the evolution of the first synapsids. What is the defining synapomorphy of synapsis?

a. the possession of the amniotic egg

b. a single temporal fenestra

c. the dentary squamosal joint

d. respiration with a diaphragm

e. endothermic metabolism

+1

Answers (1)

Know the Answer?

Grant Blevins · Answer 1

b. a single temporal fenestra

Explanation:

Synapsids have a temporary fossa in the lower part of the temporal bone. These reptiles mamiferoides only have a single inferior temporal fenestra.

The synapsids were the first amniots to diversify and appeared in the middle of the Carboniferous. These first synapses were characterized by the presence of a single temporary fenestra behind each orbit, through which the mandibular muscles pass.

Mammalian evolution began with the evolution of the first synapsids. What is the defining synapomorphy of synapsis?a. the possession of the amniotic eggb. a single temporal fenestrac. the dentary squamosal jointd. respiration with a diaphragme. endothermic metabolism

Mammalian evolution began with the evolution of the first synapsids. What is the defining synapomorphy of synapsis?

a. the possession of the amniotic egg

b. a single temporal fenestra

c. the dentary squamosal joint

d. respiration with a diaphragm

e. endothermic metabolism