The gaps you are seeing are most likely due to the default render tessellation being too course.

For nurbs I would recommend always using mental ray. Then attach a mental ray tesslation approximation node to each nurbs surface. There are a lot of options but the fastest and easiest is to select Spacial and set the length to a small value (relative to the scene).

I don't know the scale of your dino but guessing I'd say try .1 unit to start.

I did a video to demonstrate using the nurb tessellation approximation node someplace. I'll try to find it.

howto - use the mr nurbs tesselation approx node.mp4 - YouTube

The video has to do with splitting a sphere into sections and then applying a material to each section but at render time there are visible gaps between the sections (which is what I believe you are seeing).

So follow the video and creating a nurbs tessellation approximation should clean up those gaps you are seeing in your model when rendered.