USD makes additional transform node above the shape node while maya referencing

[cgarjun]

I have a USD as mentioned below, When I reference this usd in maya, I get an additional transform node.
in maya it looks like

boxes (xform / transform)
|__pCube1 (xform / transform)
    |__pCubeShape1 (xform / transform)
        |__pCubeShape1Shape (mesh/shapes)

#usda 1.0
(
    defaultPrim = "boxes"
    metersPerUnit = 0.01
    upAxis = "Y"
)

def Xform "boxes" (
    kind = "component"
)
{
    def Xform "pCube1"
    {
        def Mesh "pCubeShape1"
        {
            uniform bool doubleSided = 1
            float3[] extent = [(-0.5, -0.5, -0.5), (0.5, 0.5, 0.5)]
            int[] faceVertexCounts = [4, 4, 4, 4, 4, 4]
            int[] faceVertexIndices = [0, 1, 3, 2, 2, 3, 5, 4, 4, 5, 7, 6, 6, 7, 1, 0, 1, 7, 5, 3, 6, 0, 2, 4]
            point3f[] points = [(-0.5, -0.5, 0.5), (0.5, -0.5, 0.5), (-0.5, 0.5, 0.5), (0.5, 0.5, 0.5), (-0.5, 0.5, -0.5), (0.5, 0.5, -0.5), (-0.5, -0.5, -0.5), (0.5, -0.5, -0.5)]
            texCoord2f[] primvars:map1 = [(0.375, 0), (0.625, 0), (0.625, 0.25), (0.375, 0.25), (0.625, 0.5), (0.375, 0.5), (0.625, 0.75), (0.375, 0.75), (0.625, 1), (0.375, 1), (0.875, 0), (0.875, 0.25), (0.125, 0), (0.125, 0.25)] (
                interpolation = "faceVarying"
            )
            int[] primvars:map1:indices = [0, 1, 2, 3, 3, 2, 4, 5, 5, 4, 6, 7, 7, 6, 8, 9, 1, 10, 11, 2, 12, 0, 3, 13]
        }
    }
}