It is generally understood among breeders that a female can retain sperm up to one year. There is even the possibility of a multi-sired clutch. Spider breeds normal last year this year she gets the lesser. Eggs hatch and low and behold there are spiders normals and lessers in the clutch. To answer the next question no the two will not cross to produce a lesser spider.
The risk you can run is if you bred for a not so noticeable mutation like yellowbelly last year with out success, then breed for spiders this year. You may produce yellowbellies with out realizing it unless you look for them.
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