Maybe I don’t understand the definition of transitional species.
What are they? Please give the answer concisely, explicitly and visibly in your post without any links.
Depends on who you ask I suppose. On the creationist side it’s a convenient goal post that can always be shifted, for them every time we find a species that goes in between 2 other species that means we suddenly need to find 2 more transition species (one to get from the first one to the new find, and one to get from the new find to the second). They like that since it’s an unending source of “but”, if we found those other species they’d demand even MORE transition species. An unsatisfiable question is fun for people who are afraid of being wrong, it’s not really good logic, but they’re not into logic.
For people who actually get the science a transition species is anything that goes between two others. So with H. antecessor being between H. erectus and H. heidelbergensis that makes H. antecessor a transition. And of course H. heidelbergensis is also a transition because he gets us to H. rhodesiensis, who is also a transition since he’s part of that very last step to US homo sapiens. And hopefully we’re a transition to something else, because the only things that don’t get to be transition species are dead ends. And that would kind of suck.