Your last statement is wrong. Wikipedia is a reliable source when used correctly.
And you are behind the times in regard to what paleontologists think as well. There have been many new discoveries since their times. Many "gaps" have been filled in. This thread is about another filled gap.
And of course you do not understand what Stanley and Gould were claiming. They were stating that there are long periods of stasis along with short periods of rapid evolution. When they claimed that species appeared suddenly they were talking about geologic time. And they were essentially correct. Their work allowed people that followed to concentrate their studies in the areas of rapid evolution. Concentrating on those time periods allowed specific gaps to be filled in. Tiktaalik is the best known example of using a focused search for a transitional species.
You claim "Wikipedia is a reliable source when used correctly."? There is no such clarification in their disclaimer! What they do admit on their website
"Wikipedia is not a reliable source."along with the reason why it is
not they say "caveat lector" Latin meaning "let the buyer beware"...I believe them!
There are of coarse the claims of intermediates, if they're not outright frauds, when their history of existence is examined they appear abruptly then stasis and either go extinct or still in existence!
When the amount of intermediates links should be "truly enormous" as Darwin stated then had to admit:
"Geology assuredly does not reveal any such finely-graduated organic chain; and this is the most obvious and serious objection which can be urged against the theory". Tiktaalik...this one and only flat as a pancake, partial fossil after 26 years of searching is a desperate imagination! Tiktaalik's co-discoverer had to admit that for 26 years he found lots of fossils of fully fish and 4 legged animals but no links between the two!
Tiktaalik is described as a (lobe finned fish) and like all claimed intermediates, appears all at once in the fossil record then without changing into something else, apparently it went extinct! The fossil of the lobe finned fish coelacanth, as tiktaalik, was hailed an intermediate link until it was found still swimming around in the ocean!
Behind the times? Don't know how much more recent you can get than this Phys.org article dated Feb 19, 2013 (New species appear to arise from sudden changes): "Evolutionary stasis is an alternative scientific interpretation to the widely accepted Neo-Darwinism. It means that most species show little evolutionary change through history, instead, evolution occurs more abruptly and it can result in one species becoming two different species. The theory originated among paleontologists who study fossils. (They found that no intermediate forms of fossils exist).” Just as Darwin observed in his day! All these years later and still no intermediate forms found! My emphasis on the last sentence!