Definitely not a spider, which is one of the easiest morphs to identify at first glance. Not totally sure what he is by looking, can you get some pictures of his whole body and close ups of his head?
Edit;
These are the two snakes I have with spider in them:
Giovanni, who is a lesser bee. A regular spider won't be the same color as him, but the pattern would look the same
The head is particularly indicative of a spider, the patterning here looks almost web-like.
This one is my bumblebee. The addition of pastel breaks up the pattern some, but you can still very clearly see the spider influence.
See what I'm talking about?