I have trouble labeling my saved seeds. See the wonderfully healthy seeds I saved last year? The plants they were harvested from had few pests last year. The pepo were in my best soil. Other pepo squash in unimproved soil succumbed to squash bugs and vine borers. I was not surprised. As the soil is now warmed, I planted some of these without ID anyway. But... in a place where bush squash is really what is needed. I hope it's zucchini!
Below are the original seed from my suspects. To me, they look most like the black zucchini. My seeds are slightly larger than the purchased seeds. The pictures are not quite to scale.
this won’t help you much, i guess, but recently i was compiling seeds from my moschata landrace and was struck by how much variation in size and shape there was - even within the same species. big seeds from medium-sized squash, small seeds from really big ones... i suspect that seed size and shape are inherited from the mother, but id’ing variety via seeds is a challenge that i’m not up to.