Do the eyes meet along their entire length from the “forehead” to the nape of the neck, and is the abdomen very narrow just behind thorax then tapers uniformly to the tip?
Do the eyes meet at the “forehead” but separate again toward the nape of the neck in a “v” shaped notch, and the abdomen widens significantly at some point along its length?

Written by Mark Lung and Stefan Sommer, 2000
Photos by Dennis Paulson, 2001.