Description
Several characteristics unique to Limnarchia were identified when the clade was named in 2000. Most of these characteristics, called synapomorphies, relate to the shapes of bones on the underside and back of the skull. Limnarchian synapomorphies nclude the presence of a row of teeth stemming from the ectopterygoid bone on the palate, the maxilla bone touching the vomer near the edge of the palate (these bones are separated by an opening in euskelian skulls), and the lack of bony projections called denticles on the vomer. Other characteristic features of limnarchians include the extension of the lower jaw behind the jaw joint, and a small hole called the paraquadrate foramen at the back of the skull. The only limnarchian synapomorphy not found in the skull is the elongated shape of the interclavicle bone in the pectoral girdle.
Read more about this topic: Limnarchia
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