Thanks for the question, Jeff Hileman. I apologize for not getting to it sooner. Here are a couple of web pages which discuss Haeckel's drawings -- made in the latter part of the 19th century -- well over a hundred years ago.
Yes, old news.
There appear to have been a number of versions of the Haeckel drawing and some arguments and counter-arguments -- and some of both have been refuted.
It might prove interesting to discover how the Haeckel drawings were used in the textbooks. Where they used as an example of an earlier scientific idea, or as up-to-date and modern scientific theory?
It may well be that the context of the drawings in the textbooks is quite valid, but I wouldn't know unless I saw the textbooks.
The war some biblical literalists have over evolution is entirely unnecessary. The disagreement they have also includes other elements of science (particularly those which show that humanity and the universe are far older than 6000 years). This is also unnecessary.
Why is their disagreement with science unnecessary? For one, because our Lord and Master said that we should have humility. But also because a timeline has been found in Genesis which is compatible with those of science.
Imagine that! The Bible and science in agreement, after all.