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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

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Answers (1)
  1. 31 March, 02:43
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    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.
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